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Academic literature on the topic 'Cyclones Tracking'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Cyclones Tracking"

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Xia, Lan, and Yue Zhou. "Tracking Jianghuai Cyclones in China and Their Climate Characteristics." Atmosphere 9, no. 9 (August 30, 2018): 341. http://dx.doi.org/10.3390/atmos9090341.

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A Jianghuai cyclone is an extratropical cyclone, which influences the middle and lower reaches of the Yangtze River and Huai River basins in China. According to the definition of Jianghuai cyclones, statistics of their climate characteristics from 1979 to 2010 are obtained by an objective detection and tracking algorithm using ERA-Interim reanalysis data. The results show that the frequency of Jianghuai cyclones has a strong year-to-year variability but no obvious trend. Jianghuai cyclones are most frequent in May but fewest in December. As the cold air is active in spring, which interacts with the warm air from the southwest of the subtropical high at the Yangtze-Huai River region, it makes Jianghuai cyclones occur more frequently in this season. The main origins of Jianghuai cyclones are located in the Poyang Lake region, Dongting Lake region, and Dabie Mountain area. The maximum deepening rate of 0–2 hPa/6 h is featured in 66.4% of Jianghuai cyclones. Over 40% of Jianghuai cyclones have a mean deepening rate of 0–1 hPa/6 h. The lifetime of Jianghuai cyclones is short, mainly lasting for one to two days. In addition, background characteristics are compared between the formation, climax, and decaying periods of Jianghuai cyclones.
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Picornell, M. A., J. Campins, and A. Jansà. "Detection and thermal description of medicanes from numerical simulation." Natural Hazards and Earth System Sciences Discussions 1, no. 6 (December 12, 2013): 7417–47. http://dx.doi.org/10.5194/nhessd-1-7417-2013.

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Abstract. Tropical-like cyclones rarely affect the Mediterranean region and they can produce strong winds and heavy precipitations. These warm-core cyclones, called MEDICANES (MEDIterranean hurriCANES), are small size, develop over the sea and are infrequent. For these reasons, the detection and forecast of medicanes are a difficult task and many efforts have been devoted to identify them. The goals of this work are to contribute to a proper description of these structures and to develop some criteria to identify medicanes from numerical weather prediction (NWP) model outputs. To do that, existing methodologies for detecting, characterizating and tracking cyclones have been adapted to small-scale intense cyclonic perturbations. First, a mesocyclone detection and tracking algorithm has been modified to select intense cyclones. Next, the parameters that define the Hart's cyclone phase diagram are tuned and calculated to examine their thermal structure. Four well-known medicane events have been described from numerical simulation outputs of the ECMWF model. The predicted cyclones and their evolution have been validated against available observational data and numerical analyses from literature.
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Picornell, M. A., J. Campins, and A. Jansà. "Detection and thermal description of medicanes from numerical simulation." Natural Hazards and Earth System Sciences 14, no. 5 (May 7, 2014): 1059–70. http://dx.doi.org/10.5194/nhess-14-1059-2014.

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Abstract. Tropical-like cyclones rarely affect the Mediterranean region but they can produce strong winds and heavy precipitations. These warm-core cyclones, called MEDICANES (MEDIterranean hurriCANES), are small in size, develop over the sea and are infrequent. For these reasons, the detection and forecast of medicanes are a difficult task and many efforts have been devoted to identify them. The goals of this work are to contribute to a proper description of these structures and to develop some criteria to identify medicanes from numerical weather prediction (NWP) model outputs. To do that, existing methodologies for detecting, characterizating and tracking cyclones have been adapted to small-scale intense cyclonic perturbations. First, a mesocyclone detection and tracking algorithm has been modified to select intense cyclones. Next, the parameters that define the Hart's cyclone phase diagram are tuned and calculated to examine their thermal structure. Four well-known medicane events have been described from numerical simulation outputs of the European Centre for Medium-Range Weather Forecast (ECMWF) model. The predicted cyclones and their evolution have been validated against available observational data and numerical analyses from the literature.
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Raible, C. C., P. M. Della-Marta, C. Schwierz, H. Wernli, and R. Blender. "Northern Hemisphere Extratropical Cyclones: A Comparison of Detection and Tracking Methods and Different Reanalyses." Monthly Weather Review 136, no. 3 (March 1, 2008): 880–97. http://dx.doi.org/10.1175/2007mwr2143.1.

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Abstract The applicability of three different cyclone detection and tracking schemes is investigated with reanalysis datasets. First, cyclone climatologies and cyclone characteristics of the 40-yr ECMWF Re-Analysis (ERA-40) are compared with the NCEP–NCAR dataset using one method. ERA-40 shows systematically more cyclones, and therefore a higher cyclone center density, than the NCEP–NCAR reanalysis dataset. Geostrophically adjusted geopotential height gradients around cyclone centers, a measure of cyclone intensity, are enhanced in ERA-40 compared with the NCEP–NCAR reanalysis dataset. The variability of the number of cyclones per season is significantly correlated between the two reanalysis datasets, but time series of the extreme cyclone intensity exhibit a higher correlation. This suggests that the cyclone intensity is a more robust measure of variability than the number of cyclones. Second, three cyclone detection and tracking schemes are compared, based on the ERA-40 dataset. In general the schemes show a good correspondence. The approaches differ in technical aspects associated with the cyclone identification and the tracking procedure, leading to deviations in cyclone track length. However, it is often not clear which scheme is correct or incorrect. With the application of lifetime thresholds, some of the cyclone tracks are too short to be included in statistical measures of cyclones. Nevertheless, consequences of these differences in mean cyclone characteristics are minor, but for specific research questions—for example, what is the cyclone activity in the Mediterranean in winter—the users should be aware of these potential differences and adjust their scheme if necessary. A trend analysis of cyclone characteristics shows that results appear to be sensitive to both the choice of cyclone detection and tracking schemes and the reanalysis dataset.
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Lim, Eun-Pa, and Ian Simmonds. "Southern Hemisphere Winter Extratropical Cyclone Characteristics and Vertical Organization Observed with the ERA-40 Data in 1979–2001." Journal of Climate 20, no. 11 (June 1, 2007): 2675–90. http://dx.doi.org/10.1175/jcli4135.1.

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Abstract The mean characteristics and trends of Southern Hemisphere (SH) winter extratropical cyclones occurring at six levels of the troposphere over the period 1979–2001 have been investigated using the 40-yr ECMWF Re-Analysis (ERA-40) data. Cyclonic systems were identified with the Melbourne University cyclone finding and tracking scheme. This study shows that mean sea level pressure (MSLP) cyclones are more numerous, more intense, smaller, deeper, and slower moving than higher-level cyclones. The novel vertical tracing scheme devised for this research revealed that about 52% of SH winter MSLP cyclones have a vertically well organized structure, extending through to the 500-hPa level. About 80% of these vertically coherent SH cyclones keep their westward tilt until the surface cyclones reach their maximum depths, and the mean distance is 300 km between the surface and the 500-hPa level cyclone centers when the surface cyclones obtain their maturity. According to the authors’ definition of vertical organization, explosively developing cyclones are vertically very well organized systems, whose surface development is antecedent to their 500-hPa level counterpart. Over 1979–2001 cyclones have increased in their system density, intensity, and translational velocity but decreased in their scale at almost all levels. However, some of the trends are not statistically significant. The proportion of vertically well organized systems in the entire population of SH winter extratropical cyclones has considerably increased over the last 23 yr, and the mean distance between the surface and the 500-hPa- level cyclone centers has decreased. Such changes in vertical organization of extratropical cyclones are statistically significant at the 95% confidence level.
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Neu, Urs, Mirseid G. Akperov, Nina Bellenbaum, Rasmus Benestad, Richard Blender, Rodrigo Caballero, Angela Cocozza, et al. "IMILAST: A Community Effort to Intercompare Extratropical Cyclone Detection and Tracking Algorithms." Bulletin of the American Meteorological Society 94, no. 4 (April 1, 2013): 529–47. http://dx.doi.org/10.1175/bams-d-11-00154.1.

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The variability of results from different automated methods of detection and tracking of extratropical cyclones is assessed in order to identify uncertainties related to the choice of method. Fifteen international teams applied their own algorithms to the same dataset—the period 1989–2009 of interim European Centre for Medium-Range Weather Forecasts (ECMWF) Re-Analysis (ERAInterim) data. This experiment is part of the community project Intercomparison of Mid Latitude Storm Diagnostics (IMILAST; see www.proclim.ch/imilast/index.html). The spread of results for cyclone frequency, intensity, life cycle, and track location is presented to illustrate the impact of using different methods. Globally, methods agree well for geographical distribution in large oceanic regions, interannual variability of cyclone numbers, geographical patterns of strong trends, and distribution shape for many life cycle characteristics. In contrast, the largest disparities exist for the total numbers of cyclones, the detection of weak cyclones, and distribution in some densely populated regions. Consistency between methods is better for strong cyclones than for shallow ones. Two case studies of relatively large, intense cyclones reveal that the identification of the most intense part of the life cycle of these events is robust between methods, but considerable differences exist during the development and the dissolution phases.
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Muskulus, M., and D. Jacob. "Tracking cyclones in regional model data: the future of Mediterranean storms." Advances in Geosciences 2 (February 22, 2005): 13–19. http://dx.doi.org/10.5194/adgeo-2-13-2005.

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Abstract. With the advent of regional climate modelling, there are high-resolution data available for regional climatological change studies. Automatic tracking of cyclones in these datasets encounters problems with high spatial resolution due to cyclone substructure. Watershed segmentation, a technique from image analysis, has been used to obtain estimates for the spatial extent of cyclones, enabling better tracking and precipitation analysis. In this study we have used data from a 0.5° Regional Model (REMO) climatological model run for the period from 1961-2099, following the International Panel on Climate Change Special Report on Emissions Scenarios (IPCC SRES) B2 forcing. The resulting hourly mean sea level pressure (MSLP) fields have been analysed for cyclone numbers and tracks in the Mediterranean region. According to the results, the total number of cyclones in the Mediterranean seems to be increasing in the future, in spite of a general decrease of the numbers of stronger systems. In Summer, the increase in each gridbox seems to be proportional to the total number of cyclones in that box, whereas in Winter there is a slight proportional decrease. As concerns track properties and precipitation estimates along tracks, no significant change could be detected.
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Aragão, Leonardo, and Federico Porcù. "Cyclonic activity in the Mediterranean region from a high-resolution perspective using ECMWF ERA5 dataset." Climate Dynamics 58, no. 5-6 (October 15, 2021): 1293–310. http://dx.doi.org/10.1007/s00382-021-05963-x.

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AbstractThis study focuses on developing a new Cyclone Detection and Tracking Method (CDTM) to take advantage of the recent availability of a high-resolution reanalysis dataset of ECMWF ERA5. The proposed algorithm is used to perform a climatological analysis of the cyclonic activity in the Mediterranean Region (MR) into a 40-year window (1979–2018). The tuning of the new CDTM was based on the comparison with currently available CDTMs and verified through careful subjective analysis to fully exploit the finer details of MR cyclones features. The application of the new CDTM to the ERA5 high-resolution dataset resulted in an increase of 40% in the annual number of cyclones, mainly associated with subsynoptic and baroclinic driven lows. The main cyclogenetic areas and seasonal cycle were properly identified into the MR context, including areas often underestimated, such as the Aegean Sea, and emerging new ones with cyclogenetic potential such as the coast of Tunisia and Libya. The better cyclone features description defined three distinct periods of cyclonic activity in the MR with peculiar and persistent characteristics. In the first period (Apr–Jun), cyclones develop more frequently and present higher velocities and deepening rates. In the second (Jul–Sep), the cyclonic activity is governed by thermal lows spreading slowly over short tracks without reaching significant depths. In the last and longest season (Oct–Mar), cyclones become less frequent, but with the highest deepening rates and the lowest MSLP values, ranking this period as the most favourable to intense storms.
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Ragone, Francesco, Monica Mariotti, Antonio Parodi, Jost von Hardenberg, and Claudia Pasquero. "A Climatological Study of Western Mediterranean Medicanes in Numerical Simulations with Explicit and Parameterized Convection." Atmosphere 9, no. 10 (October 11, 2018): 397. http://dx.doi.org/10.3390/atmos9100397.

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The semi-enclosed Mediterranean basin, surrounded by high mountains, is placed in a favorable location for cyclonic storms development. Most of these are extratropical cyclones of baroclinic and orographic origin, but occasionally, some low pressure systems may develop to assume features characteristic of tropical cyclones. Medicanes (MEDIterranean hurriCANES) are infrequent and small-sized tropical-like cyclones. They originate and develop over sea, and are associated with strong winds and heavy precipitations. Proper definitions and classifications for Medicanes are still partially lacking, and systematic climatic studies have appeared only in recent years. In this work, we provide climatologies of Medicanes in the Western Mediterranean basin based on multidecadal runs performed with the Weather Research and Forecasting regional model with different resolutions and setups. The detection of Medicanes is based on a cyclone tracking algorithm and on the methodology of Hart cyclone phase space diagrams. We compare the statistics of Medicanes in the historical period 1979–1998 between runs at a resolution of 11 km with different convective parameterizations and microphysics schemes and one run at a resolution of 4 km with explicitly resolved convection. We show how different convective parameterization schemes lead to different statistics of Medicanes, while the use of different microphysical schemes impacts the length of the cyclone trajectories.
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Pfahl, Stephan, Paul A. O’Gorman, and Martin S. Singh. "Extratropical Cyclones in Idealized Simulations of Changed Climates." Journal of Climate 28, no. 23 (December 1, 2015): 9373–92. http://dx.doi.org/10.1175/jcli-d-14-00816.1.

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Abstract Cyclones are a key element of extratropical weather and frequently lead to extreme events like wind storms and heavy precipitation. Understanding potential changes of cyclone frequency and intensity is thus essential for a proper assessment of climate change impacts. Here the behavior of extratropical cyclones under strongly varying climate conditions is investigated using idealized climate model simulations in an aquaplanet setup. A cyclone tracking algorithm is applied to assess various statistics of cyclone properties such as intensity, size, lifetime, displacement velocity, and deepening rates. In addition, a composite analysis of intense cyclones is performed. In general, the structure of extratropical cyclones in the idealized simulations is very robust, and changes in major cyclone characteristics are relatively small. Median cyclone intensity, measured in terms of minimum sea level pressure and lower-tropospheric relative vorticity, has a maximum in simulations with global mean temperature slightly warmer than present-day Earth, broadly consistent with the behavior of the eddy kinetic energy analyzed in previous studies. Maximum deepening rates along cyclone tracks behave similarly and are in agreement with linear quasigeostrophic growth rates if the effect of latent heat release on the stratification is taken into account. In contrast to moderate cyclones, the relative vorticity of intense cyclones continues to increase with warming to substantially higher temperatures, and this is associated with enhanced lower-tropospheric potential vorticity anomalies likely caused by increased diabatic heating. Moist processes may, therefore, lead to the further strengthening of intense cyclones in warmer climates even if cyclones weaken on average.
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Dissertations / Theses on the topic "Cyclones Tracking"

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Marriage, Benjamin P. "Automatic detection and tracking of Southern Hemisphere cyclones." Thesis, University of Edinburgh, 2002. http://hdl.handle.net/1842/15271.

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The work contained in this thesis is toward producing an objective cyclone climatology of the extra-tropical regions of the Southern Hemisphere using observational data. The data identified as being the most appropriate for this task was the high resolution multi-spectral imagery produced by the Advanced Very High Resolution Radiometer (AVHRR) on board the National Oceanographic and Atmospheric Administration (NOAA) series of polar-orbiting satellites. A series of algorithms are presented to perform the automatic detection and tracking of cyclones in the Southern Hemisphere. Cloud detection was performed using a number of spectral and textural measures. Individual cloud objects were segmented using thresholding techniques. These cloud objects were pre-processed using an image normalisation algorithm to create an image (feature vector) which was invariant to rotation, translation, scaling and skew. Identification and tracking of cyclones was performed by finding the maximum cross-correlation between the normalised target images and a set of pre-defined normalised templates. Problems with automatically distinguishing between cloud and the surface near Antarctica still remain, and subsequently segmentation of the imagery into individual cloud objects was limited to certain cases. Identification of cyclones by matching with the pre-defined normalised templates was also shown to have only very limited ability to distinguish between cyclone cloud objects and non-cloud objects. Tracking of the cyclones once they have been manually identified and measured was shown to be promising, with the algorithm successfully tracking the cyclone in 16 out of 22 pairs of satellite images taken from 4 case studies of real Southern Hemisphere cyclones. Limitations of the tracking scheme were identified and improvements have been suggested.
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Halterman, R. Ryan. "Observation and tracking of tropical cyclones using resolution enhanced scatterometry /." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1667.pdf.

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Halterman, Richard Ryan. "Observation and Tracking of Tropical Cyclones Using Resolution Enhanced Scatterometry." BYU ScholarsArchive, 2006. https://scholarsarchive.byu.edu/etd/1062.

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The QuikSCAT scatterometer provides global daily coverage of oceanic near-surface vector winds. Recently, algorithms have been developed to enhance the spatial resolution of QuikSCAT winds from 25~km to 2.5~km posting. These ultra-high resolution winds are used, in comparison with standard L2B data product winds, to observe and track tropical cyclones. Resolution enhanced winds are found to provide additional storm structure such as inner core size and structure and the presence of multiple eyewalls compared with standard resolution winds. The 2.5~km winds are also able to observe storms nearer to the shore than 25~km winds. An analysis of circulation center locatability with each resolution wind field is performed. Center fixes with enhanced resolution winds are nearer the National Hurricane Center best-track positions than are standard resolution center fixes. A data and image set of every tropical cyclone worldwide observed by Seawinds on QuikSCAT or SeaWinds on ADEOS II from 1999 through 2005 is generated and made available to the scientific community at http://scp.byu.edu.
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Ryerson, William R. "Evaluation of the AFWA WRF 4-km moving nest model predictions for Western North Pacific tropical cyclones." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Mar%5FRyerson.pdf.

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Fenlason, Joel W. "Accuracy of tropical cyclone induced winds using TYDET at Kadena AB." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Mar%5FFenlason.pdf.

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Knowland, Katherine Emma. "Linking mid-latitude storms, atmospheric composition and climate variability." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/15975.

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In this thesis, the role of mid-latitude cyclones in air pollution transport in the Northern Hemisphere is quantified. The storm tracking model, TRACK, is used to study the mechanisms through which pollution, specifically ozone (O3) and carbon monoxide (CO), are vented from the boundary layer to the free troposphere and thus transported over large distances, as well as the introduction of O3 from the stratosphere into the troposphere. The relationship between mid-latitude cyclones and air pollution transport of O3 and CO is explored for the first time using the Monitoring Atmospheric Composition and Climate (MACC) reanalysis, a combined meteorology and composition reanalysis dataset. A comparison between springtime surface ozone measurements at rural background sites on the west coast of Europe and cyclone track frequency in the surrounding regions was used to first establish the correlation between cyclone location and surface air quality. The focus is on spring as it tends to be the season of maximum intercontinental transport of O3. The surface observations were compared to the MACC O3 values at the same locations and case studies of how cyclones can influence surface O3 measurements are described. When cyclones track north of 53°N, there is a significant probability that the surface O3 will be high (> the 75th percentile), due to the close proximity to stratospheric intrusions and the transport at low levels across the North Atlantic Ocean. The most intense spring cyclones (95th percentile) were selected for two regions, the North Atlantic and the North Pacific, for further investigation into the mechanisms which impact O3 and CO concentrations near cyclones. These intense cyclones ( 60 over each region) often tracked over the major emission sources of eastern North America and East Asia. The distributions of MACC O3 and CO within a "typical" intense cyclone are examined by compositing the cyclones together. The cyclone-centered composites were compared to background composites of "average conditions" created by sampling the reanalysis data of the previous year to the cyclone locations. Mid-latitude cyclones are found to redistribute concentrations of O3 and CO horizontally and vertically throughout the cyclone. This is clearly shown to occur through two main mechanisms: (1) vertical lifting of CO-rich and O3-poor air isentropically from near the surface to the mid- to upper-troposphere in the region of the warm conveyor belt; and (2) descent of O3-rich and CO-poor air isentropically in the vicinity of the dry intrusion, from the stratosphere toward the mid-troposphere. This work was expanded to identify the links between teleconnection patterns, mainly the North Atlantic Oscillation (NAO), that affect the major storm track pathways in the North Atlantic sector and the distribution of MACC O3 and CO throughout the troposphere and lower stratosphere. For this analysis, TRACK was used to calculate seasonal weighted-average O3 and CO distribution maps based on the monthly NAO index. During positive NAO phase, the persistence of low pressures over the North Atlantic coupled with the Azores High promotes transport across the North Atlantic throughout the troposphere. During negative NAO phase, blocking high pressure in the eastern North Atlantic are known to occur, which shifts transport pathways to a more southerly zonal flow. This work demonstrates the complex relationship between the horizontal and vertical distribution of pollution, including surface concentrations, and synoptic-scale systems.
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Kehoe, Ryan M. "Characteristic errors in 120-H tropical cyclone track forecasts in the western North Pacific." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://handle.dtic.mil/100.2/ADA432822.

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Hanafy, Shalaby Hemdan. "ON THE POTENTIAL OF LARGE EDDY SIMULATION TO SIMULATE CYCLONE SEPARATORS." Doctoral thesis, Universitätsbibliothek Chemnitz, 2007. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200700133.

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This study was concerned with the most common reverse flow type of cyclones where the flow enters the cyclone through a tangential inlet and leaves via an axial outlet pipe at the top of the cyclone. Numerical computations of two different cyclones were based on the so-called Stairmand cyclone. The difference in geometry between these two cyclones was basically characterized by the geometrical swirl number Sg of 3.5 and 4. Turbulent secondary flows inside a straight square channel have been studied numerically by using Large Eddy Simulation (LES) in order to verify the implementation process. Prandtl’s secondary motion calculated by LES shows satisfying agreement with both, Direct Numerical Simulation (DNS) and experimental results. Numerical calculations were carried out at various axial positions and at the apex cone of a gas cyclone separator. Two different NS-solvers (a commercial one, and a research code), based on a pressure correction algorithm of the SIMPLE method have been applied to predict the flow behavior. The flow was assumed as unsteady, incompressible and isothermal. A k − epsilon turbulence model has been applied first using the commercial code to investigate the gas flow. Due to the nature of cyclone flows, which exhibit highly curved streamlines and anisotropic turbulence, advanced turbulence models such as RSM (Reynolds Stress Model) and LES (Large Eddy Simulation) have been used as well. The RSM simulation was performed using the commercial package CFX4.4, while for the LES calculations the research code MISTRAL/PartFlow-3D code developed in our multiphase research group has been applied utilizing the Smagorinsky model. It was found that the k − epsilon model cannot predict flow phenomena inside the cyclone properly due to the strong curvature of the streamlines. The RSM results are comparable with LES results in the area of the apex cone plane. However, the application of the LES reveals qualitative agreement with the experimental data, but requires higher computer capacity and longer running times than RSM. These calculations of the continuous phase flow were the basis for modeling the behavior of the solid particles in the cyclone separator. Particle trajectories, pressure drop and the cyclone separation efficiency have been studied in some detail. This thesis is organized into five chapters. After an introduction and overview, chapter 2 deals with continuous phase flow turbulence modeling including the governing equations. The emphasis will be based on LES modelling. Furthermore, the disperse phase motion is treated in chapter 3. In chapter 4, the validation process of LES implementation with channel flow is presented. Moreover, prediction profiles of the gas flow are presented and discussed. In addition, disperse phase flow results are presented and discussed such as particle trajectories; pressure drop and cyclone separation efficiency are also discussed. Chapter 5 summarizes and concludes the thesis.
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Dutra, Lívia Márcia Mosso. "Ciclones subtropicais sobre o Atlântico Sul: análise da estrutura dinâmica de eventos." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/14/14133/tde-14052012-132233/.

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Neste trabalho, o objetivo geral é investigar os processos sinóticos, dinâmicos e termodinâmicos de dois ciclones subtropicais ocorridos no Atlântico Sul. Utilizou-se um algoritmo de rastreamento de máximos de vorticidade ciclônica e o algoritmo Cyclone Phase Space (CPS), que permite classificar o ciclo de vida dos ciclones. Desenvolveu-se um processo de automatização destes algoritmos, que possibilitou a análise dos diagramas de fase de todos os ciclones ocorridos no Atlântico Subtropical durante 2008, 2009 e março de 2010. As condições sinóticas para dois eventos foram analisadas desde o período prévio à formação até o decaimento dos sistemas, e as equações do balanço de vorticidade e de calor foram utilizadas para investigar os processos dinâmicos e termodinâmicos. Embora com fraca intensidade em termos de pressão central, os ciclones tiveram impacto importante nas condições de tempo sobre suas regiões de atuação, e os ventos máximos superaram 15 m/s em 925 hPa por várias horas. Ambos os ciclones apresentaram, ao menos em algum tempo de sua fase subtropical, um pico de advecção horizontal quente em altos níveis, enquanto a advecção horizontal quente em baixos níveis apresentou fraca intensidade. Nos estágios de fase híbrida, o termo diabático foi responsável pelas tendências de aquecimento em baixos níveis. Já durante a fase de transição extratropical ocorrida em um dos ciclones, o sentido dos fluxos turbulentos em superfície se inverteu e o termo diabático passou a contribuir para tendências de resfriamento em baixos níveis. Em altos níveis, foram encontradas regiões em que altos valores positivos do termo diabático da equação da termodinâmica correspondem a regiões de intenso resíduo negativo da equação da vorticidade. Nestas regiões, os processos convectivos podem explicar os imbalanços de vorticidade. Nas demais regiões e níveis em que esta relação não ocorreu, sugere-se que a convecção influencia as variações locais de vorticidade de uma forma mais distribuída na coluna atmosférica, assim como a divergência associada aos movimentos verticais pode ocorrer de forma distribuída ao longo da troposfera.
This work aims to investigate the synoptic and dynamic processes of a sample of subtropical cyclones that occurred near the east coast of South America. A cyclonic vorticity maximum tracking algorithm and the Cyclone Phase Space (CPS) algorithm are used to track and to classify the life cycle evolution of the cyclones. By automating these algorithms, it was possible to perform the analysis of the phase diagrams of all the cyclones occurred in the Subtropical Atlantic during 2008, 2009 and March 2010. The synoptic conditions for two events were analyzed from the period prior to the genesis until the decay of the systems, and the heat and vorticity balance equations were used to investigate the thermodynamic and dynamic processes. Although with low intensity in terms of central pressure, the cyclones had a major impact on the weather conditions in their regions of occurrence, and the 925 hPa maximum sustained winds exceeded 15 m/s for several hours. Both selected cyclones, at least at a time of its subtropical phase, had a peak of warm horizontal advection at higher levels, whilst the warm horizontal advection at lower levels showed weak intensity. In the hybrid stages of both cyclones, the diabatic term was responsible for warming trends at low levels. However, during the extratropical transition in one of the cyclones, the direction of the near-surface turbulent fluxes reversed and the diabatic term began to contribute to cooling trends at low levels. In the upper troposphere, it was found that in some regions that featured large positive values of the thermodynamic equation diabatic term, there was also a significant negative residual of the vorticity equation. In these regions, the convective processes can explain the observed vorticity imbalances. For other regions and levels, at which there was no direct relationship between the residual fields, it is suggested here that convection influences the local variations of vorticity in a more distributed way in the atmospheric column, as well as the divergence associated with the vertical velocities can be more distributed throughout the troposphere, without being concentrated at only some levels.
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Martins, Varino Filipa Catarina. "Typologie des tempêtes du XXe siècle." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30389/document.

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L'étude de la variabilité des cyclones extra-tropicaux (ETC) est non seulement un sujet d'intérêt pour la communauté scientifique mais aussi d'une grande importance en raison de ses impacts socio-économiques. Toutefois, l'étude continué de la variabilité des ETC et de leurs impacts est encore rare, en particulier a l'échelle de temps du Xeme siècle. Cette thèse vise a étudier la variabilité des trajectoires de tempêtes et de leurs dégâts associés du début du Xxeme siècle a 2010. Pour ce faire, le travail est divisé en deux sections principales, l'une dédiée a la climatologie des ETCs au cours du siècle dernier a partir de données de réanalyse, et la seconde centrée sur le calcul d'indices de pertes et l'évaluation des risques induits par les tempêtes. On s'intéresse en premier lieu a l'étude de la variabilité des ETCs par l'application d'un algorithme de suivi de cyclone, sur la réanalyse de long terme du Centre Européen (ECMWF) ERA-20C. Le nombre annuel d'ETC modérées a intenses fait ressortir trois périodes historiques distinctes. Deux périodes, l'une au début et la seconde à la fin du Xeme siècle (1900-1935 et 1980-2010) ne présentent aucune tendance tandis qu'au milieu du siècle (1930-1980) une tendance significative à l'augmentation apparait. Cette dernière peut toutefois être interrogée en raison de l'inhomogénéité temporelle des réanalyses de long terme. Pour cette raison, un ensemble de paramètres physiques sont analysés en vue d'interpréter physiquement les trois périodes. Durant la période 1930-1980, un refroidissement général de l'atmosphère est observé, en particulier aux hautes latitudes, qui augmente le gradient méridien de température et en conséquence la baroclinicité et la conversion barocline. Par ailleurs, cette augmentation de la fréquence d'ETC est observée spécifiquement sur le Pacifique (Atlantique) au cours de la première (seconde) moitié de la période en lien avec une inversion de l'indice Oscillation Décennale du Pacifique (Oscillation Multidecennale Atlantique). La seconde partie de la thèse s'intéresse à l'analyse des tempête scausant les plus forts dégâts du Xeme siècle. Tout d'abord, on calcule un champ d'indices de dégâts de vents forts pour plus de vingt pays. On développe ensuite une Méthode de Suivi de Tempêtes de Forts Dégâts et les résultats de l'algorithme de suivi sont combinés avec les indices de dégâts de vents forts pour chaque pays. [...]
Extratropical cyclones (ETCs) variability is not only a subject that raises interest among the scientific community, but also extremely important in terms of social-economical impacts. Nevertheless, the study of both the extratropical cyclones variability and windstorms impacts is still scarce, particularly at time-scales that cover the twentieth century. This thesis aims to study, both storms track variability and associated losses from the beginning of the 20th century until 2010. In order to do so, the work was separated in two main parts, one witch focus on ETCs climatology during the last century using reanalysis data and another focused on loss indexes calculations and risk assessment of windstorms. The first part of this PhD concerns the study of ETCs variability after applying a tracking algorithm on the long-term ECMWF reanalysis ERA-20C. The number of ETCs per year shows three distinct periods for the moderate and deep cyclones. Two periods, one at the beginning and another at end of the century (1900-1935 and 1980-2010) for which no significant e trends are observed and a middle-century period between 1935-1980 which presents a significant positive trend. This last trend, however, a deeper analysis on this period should be done due to time-inhomogeneity of long-term reanalysis datasets. For this reason, a set of physical parameters are analysed and a physical interpretation made for each one of the periods. During the middle period, a general cooling of the atmosphere is observed, particularly at high-latitudes, which increases the meridional gradients of temperature and consequently baroclinicity and baroclinic conversion. Besides that, this increase is also observed more specifically in the Pacific (Atlantic) in the first (second) half of this period and linked with a Pacific Decadal Oscillation (Atlantic Multidecadal Oscillation) change in signs. On the opposite, the first and third periods are related with warmer polar temperatures that are more intense in the third period but never reach the upper levels of the troposphere. This creates differential changes in baroclinicity. On the one hand, baroclinicity decreases at lower levels and, on the other hand increases at upper levels. The second part of this thesis is focused on the analysis of the most damaging windstorms of the century. First, Loss and Meteorological indexes Pinto et al 2012 are computed for more than twenty countries. Then, a High-Loss Tracking Method is developed and the tracking algorithm trajectories are matched with the LI and MI information for each country. [...]
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Books on the topic "Cyclones Tracking"

1

Talukder, Jyotirmoy. Living with cyclone: Study on storm surge prediction and disaster preparedness. Dhaka, Bangladesh: Community Development Library, 1992.

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International Familiarisation Course on Cyclone Tracking, Disaster Assessment, and Management (1987 Madras, India). International Familiarisation Course on Cyclone Tracking, Disaster Assessment, and Management, 16-28 November 1987. Madras, India: The Institute, 1987.

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Monitoring and Prediction of Tropical Cyclones in the Indian Ocean and Climate Change. Springer, 2013.

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Rathore, L. S., U. C. Mohanty, M. Mohapatra, B. K. Bandyopadhyay, and O. P. Singh. Monitoring and Prediction of Tropical Cyclones in the Indian Ocean and Climate Change. Springer London, Limited, 2013.

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Collett, Anne, Russell McDougall, and Sue Thomas. Tracking the Literature of Tropical Weather: Typhoons, Hurricanes, and Cyclones. Palgrave Macmillan, 2016.

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Collett, Anne, Russell McDougall, and Sue Thomas. Tracking the Literature of Tropical Weather: Typhoons, Hurricanes, and Cyclones. Palgrave Macmillan, 2018.

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Tracking the literature of tropical weather: Typhoons, hurricanes, and cyclones. New York, NY: Springer Science+Business Media, 2016.

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Bangladesh University of Engineering and Technology., Bangladesh Institute of Development Studies., Bangladesh Parikalpanā Kamiśana, United Nations Development Programme, World Bank, and UNDP/World Bank/GOB Project BGD/91/025, eds. Multipurpose Cyclone Shelter Programme: Final report. [Dhaka]: Bangladesh University of Engineering & Technology, 1993.

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Tacking, Weather. Hurricane Tracking and Preparedness Journal 8 X 10 Notebook for the 2020 Cyclone Tornado Season: Tracking Forms and Maps for the Atlantic, Pacific, the Gulf and Caribbean Areas Plus Detailed Instructions on What Documents Are Needed to Be Prepared. Independently Published, 2020.

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Book chapters on the topic "Cyclones Tracking"

1

Ravi, Srilata. "Tropical Cyclones in Mauritian Literature." In Tracking the Literature of Tropical Weather, 25–44. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-41516-1_2.

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McDougall, Russell. "Cyclones, Indigenous and Invasive, in Northern Australia." In Tracking the Literature of Tropical Weather, 129–49. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-41516-1_7.

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Sherratt-Bado, Dawn Miranda. "Cycles and Cyclones: Structural and Cultural Displacement in Gisèle Pineau’s Macadam Dreams." In Tracking the Literature of Tropical Weather, 199–225. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-41516-1_10.

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Engelke, Wito, Talha Bin Masood, Jakob Beran, Rodrigo Caballero, and Ingrid Hotz. "Topology-Based Feature Design and Tracking for Multi-center Cyclones." In Mathematics and Visualization, 71–85. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-83500-2_5.

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Huang, Cheng, Sixian Chan, Cong Bai, Weilong Ding, and Jinglin Zhang. "Tropical Cyclones Tracking Based on Satellite Cloud Images: Database and Comprehensive Study." In MultiMedia Modeling, 13–25. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-67835-7_2.

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Suzuki-Parker, Asuka. "Tropical Cyclone Detection and Tracking Method." In An assessment of uncertainties and limitations in simulating tropical cyclone climatology and future, 9–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-25029-3_2.

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Thomas, Sue. "Catastrophic History, Cyclonic Wreckage and Repair in William Gilbert’s The Hurricane and Diana McCaulay’s Huracan." In Tracking the Literature of Tropical Weather, 227–50. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-41516-1_11.

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Thanh, Cong, Dao Nguyen Quynh Hoa, and Tran Tan Tien. "Application of Kalman Filter and Breeding Ensemble Technique to Forecast the Tropical Cyclone Activity." In Weather Forecasting [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97783.

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Tropical cyclone (TC) is one of the major meteorology disasters, as they lead to deaths, destroy the infrastructure and the environment. Therefore, how to improve the predictability of TC’s activities, such as formation, track, and intensity, is very important and is considered an important task for current operational predicting TC centers in many countries. However, predicting TC’s activities has remained a big challenge for meteorologists due to our incomplete understanding of the multiscale interaction of TCs with the ambient environment and the limitation of numerical weather forecast tools. Hence, this chapter will exhibit some techniques to improve the ability to predict the formation and track of TCs using an ensemble prediction system. Particularly, the Local Ensemble Transform Kalman Filter (LETKF) scheme and its implementation in the WRF Model, as well as the Vortex tracking method that has been applied for the forecast of TCs formation, will be presented in subSection 1. Application of Breeding Ensemble to Tropical Cyclone Track Forecasts using the Regional Atmospheric Modeling System (RAMS) model will be introduced in subSection 2.
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Conference papers on the topic "Cyclones Tracking"

1

ILIE, Vlad-Alexandru, Adina-Eliza CROITORU, and Titus-Cristian MAN. "NORD ATLANTIC CYCLONES TRACKS IN EUROPE AND THEIR INFLUENCE OVER AMOUNT OF PRECIPITATION RECORDED IN ROMANIA (1985-2015)." In SCIENTIFIC RESEARCH AND EDUCATION IN THE AIR FORCE. Publishing House of "Henri Coanda" Air Force Academy, 2022. http://dx.doi.org/10.19062/2247-3173.2022.23.27.

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The region of Romania is characterized in terms of continental temperate climate with oceanic influences. Thus, the precipitation regime and the thermal regime in this part of Europe are strongly influenced by the frequency of cyclones whose trajectories cross Europe from west to east coming from the Atlantic Ocean. The present study analyzes the variation of the amount of precipitation in Romania depending on the frequency and variation of the geographical position of the trajectories of the North Atlantic cyclones in the area of the European continent. Using the classic method of identification and tracking, 1189 cyclones were found that crossed Europe north of the Alps in a period of 30 years between December 1, 1985 - November 30, 2015, of which 71% generated precipitation in Romania. Their influence on the amount recorded at meteorological stations in Romania varies between 43% in the northwest of the country to 13% in the southern regions.
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Panangadan, Anand, Shen-Shyang Ho, and Ashit Talukder. "Cyclone tracking using multiple satellite image sources." In the 17th ACM SIGSPATIAL International Conference. New York, New York, USA: ACM Press, 2009. http://dx.doi.org/10.1145/1653771.1653836.

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Cristea, Eugen-Dan, and Pierangelo Conti. "Hybrid Eulerian Multiphase-Dense Discrete Phase Model Approach for Numerical Simulation of Dense Particle-Laden Turbulent Flows Within Vertical Multi-Stage Cyclone Heat Exchanger." In ASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/fedsm2018-83058.

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This article describes a CFD engineering application developed to investigate numerically the multiphase, non-isothermal, turbulent flow physics within the suspension preheater of a dry-process rotary cement kiln. The multi–stage cyclone preheater is a counter-current heat exchanger. We used the CFD flow solver ANSYS-Fluent R18.1. to accomplish this task. The hybrid Eulerian multiphase-dense discrete phase model is a coupled Eulerian-Lagrangian technique. The primary carrier-phase is treated as a continuum by solving the Navier-Stokes equations, while the secondary discrete dispersed-phase is solved by tracking the particle parcels through the calculated flow field. The multiphase turbulence of the carrier-phase is modeled using the Reynolds stress transport model. The dispersed-phase interactions are modeled through the specific collisions models provided by the kinetic theory of granular flow and/or discrete element method. The Eulerian multiphase-DDPM method provided a quiet stable solution for a medium/high mass loading (solid to gas mass ratio 0.89:1). The four-stage cyclone suspension preheater is analyzed for its operating performance i.e. overall pressure drop and global collection efficiency of cyclone stages, calcination degree at bottom cyclone stage, flue gas temperature at 1st. cyclone stage and availability to get more insight of very complex multi-phase flow patterns within this equipment. The set of industrial measurements, collected during a heat and mass balance of a dry process rotary cement kiln, were used to verify and to validate part of the simulation results.
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Ho, Shen-Shyang, and Ashit Talukder. "Automated cyclone tracking using multiple remote satellite data via knowledge transfer." In 2009 IEEE Aerospace conference. IEEE, 2009. http://dx.doi.org/10.1109/aero.2009.4839579.

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de Chiara, Giovanna, Raffaele Crapolicchio, Maurizio Migliaccio, and Pascal Lecomte. "Tracking a tropical cyclone with ERS-SCAT: a CMOD4 model review." In International Symposium on Remote Sensing, edited by Charles R. Bostater, Jr. and Rosalia Santoleri. SPIE, 2003. http://dx.doi.org/10.1117/12.463156.

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Ho, Shen-Shyang, and Ashit Talukder. "Automated cyclone discovery and tracking using knowledge sharing in multiple heterogeneous satellite data." In the 14th ACM SIGKDD international conference. New York, New York, USA: ACM Press, 2008. http://dx.doi.org/10.1145/1401890.1402001.

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Hyuk Park, Adriano Camps, Daniel Pascual, Alberto Alonso-Arroyo, Francisco Martin, Hugo Carreno-Luengo, and Raul Onrubia. "Simulation study on tropicial cyclone tracking from the ISS using GNSS-R measurements." In IGARSS 2014 - 2014 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2014. http://dx.doi.org/10.1109/igarss.2014.6947378.

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