Dissertations / Theses on the topic 'Large-scale atmospheric circulation'
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Larson, Kristin Ann. "Tropical climate sensitivities : clouds, water vapor, radiation and large-scale circulation /." Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/10015.
Full textPeters, Matthew E. "Moist convection and the large scale tropical circulation /." Thesis, Connect to this title online; UW restricted, 2005. http://hdl.handle.net/1773/6773.
Full textBrandefelt, Jenny. "Atmospheric circulation regimes and climate change." Doctoral thesis, Stockholm : Dept. of Meteorology, Stockholm University, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-530.
Full textZhou, Guidi [Verfasser]. "Extratropical Sea Surface Temperature Impacts on Large-Scale Atmospheric Circulation / Guidi Zhou." Kiel : Universitätsbibliothek Kiel, 2016. http://d-nb.info/1081659904/34.
Full textSmolinski, Kelly Katherine. "Interrelationships Among Large-Scale Atmospheric Circulation Regimes and Surface Temperature Anomalies in the North American Arctic." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5026.
Full textHuff, Russell. "Melt anomalies on the Greenland Ice Sheet and large scale modes of atmospheric circulation." Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3256466.
Full textAlbuquerque, Cavalcanti Iracema Fonseca de. "Large scale disturbances in the southern hemisphere tropospheric circulation-model experiments and analyses of observed data." Thesis, University of Reading, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305030.
Full textKerimoglu, Onur. "Influence Of Large Scale Atmospheric Systems On Hydorology And Ecology Of Turkish Lakes." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609272/index.pdf.
Full textGanachaud, Alexandre Similien 1970. "Large scale oceanic circulation and fluxes of freshwater, heat, nutrients and oxygen." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/58541.
Full textIncludes bibliographical references (p. 250-266).
A new, global inversion is used to estimate the large scale oceanic circulation based on the World Ocean Circulation Experiment and Java Australia Dynamic Experiment hydrographic data. A linear inverse "box" model is used to combine consistently the transoceanic sections. The circulation is geostrophic with an Ekman layer at the surface and oceanic layers defined by neutral surfaces. Near-conservation of mass, salt and top-to-bottom silica is required and, in addition, heat and the phosphate-oxygen combination (170[PO 4]+[0 2]) are conserved in layers that are not in contact with the surface. A globally-consistent solution is obtained for a depth-independent adjustment to the thermal wind field, freshwater flux divergences, the Ekman transport, and the advective and diffusive dianeutral fluxes between layers. A detailed error budget permits calculation of statistical uncertainties, taking into account both the non-resolved part of the solution and the systematic errors due to the temporal oceanic variability. The estimated water mass transports during the WOCE period (1985-1996) are generally similar to previous published estimates. However, important differences are found. In particular, the inflow of bottom waters into the Pacific Ocean is smaller than in most previous estimates. Utilization of property anomaly conservation constraints allows the estimation of significant dianeutral diffusivities in deep layers, with a global average of 3 ± 1cm 2 s-1 north of 30'S. Dianeutral transfers indicate that about 20 Sv of bottom water is formed in the Southern Ocean. Significant oceanatmosphere heat fluxes are found, with a global heating of 2.3 ± 0.4 PW in the tropical band and a corresponding cooling at high latitudes. The signature of a large-scale average export production is found for nutrients in several temperate regions. Despite the large uncertainties, the production magnitudes are consistent with independent measurements from sediment traps and isotopic data. Net nutrient sources or sinks are found in several regions, suggesting either transport of dissolved organic matter or a seasonal alias. Oxygen indicates large exchanges with the atmosphere, with intake at high latitudes and outgassing/remineralization at low latitudes.
by Alexandre Similien Ganachaud.
Sc.D.
Wetterhall, Fredrik. "Statistical Downscaling of Precipitation from Large-scale Atmospheric Circulation : Comparison of Methods and Climate Regions." Doctoral thesis, Uppsala University, Department of Earth Sciences, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-5937.
Full textA global climate change may have large impacts on water resources on regional and global scales. General circulation models (GCMs) are the most used tools to evaluate climate-change scenarios on a global scale. They are, however, insufficiently describing the effects at the local scale. This thesis evaluates different approaches of statistical downscaling of precipitation from large-scale circulation variables, both concerning the method performance and the optimum choice of predictor variables.
The analogue downscaling method (AM) was found to work well as “benchmark” method in comparison to more complicated methods. AM was implemented using principal component analysis (PCA) and Teweles-Wobus Scores (TWS). Statistical properties of daily and monthly precipitation on a catchment in south-central Sweden, as well as daily precipitation in three catchments in China were acceptably downscaled.
A regression method conditioning a weather generator (SDSM) as well as a fuzzy-rule based circulation-pattern classification method conditioning a stochastical precipitation model (MOFRBC) gave good results when applied on Swedish and Chinese catchments. Statistical downscaling with MOFRBC from GMC (HADAM3P) output improved the statistical properties as well as the intra-annual variation of precipitation.
The studies show that temporal and areal settings of the predictor are important factors concerning the success of precipitation modelling. The MOFRCB and SDSM are generally performing better than the AM, and the best choice of method is depending on the purpose of the study. MOFRBC applied on output from a GCM future scenario indicates that the large-scale circulation will not be significantly affected. Adding humidity flux as predictor indicated an increased intensity both in extreme events and daily amounts in central and northern Sweden.
Dambul, Ramzah. "The relationships between large-scale atmospheric circulation and surface climate : a case study for Borneo." Thesis, University of East Anglia, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.435307.
Full textLöfverström, Marcus. "On the interaction between ice sheets and the large-scale atmospheric circulation over the last glacial cycle." Doctoral thesis, Stockholms universitet, Meteorologiska institutionen (MISU), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-107925.
Full textAt the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Manuscript. Paper 4: Manuscript.
Yulaeva, Elena Valentinovna. "On the mechanism of the large-scale seasonally varying upwelling in the region of the tropical tropopause /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/10092.
Full textLee, Cameron C. "The Relationship of Large-Scale Atmospheric Circulation Patterns to Tornadoes and the Impacts of Climate Change." Kent State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=kent1274371690.
Full textWang, Jinbo Ph D. Massachusetts Institute of Technology. "Instabilities of an eastern boundary current with and without Large-scale Flow Influence." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68890.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (p. 221-227).
Eastern oceanic boundary currents are subject to hydrodynamic instability, generate small scale features that are visible in satellite images and may radiate westward into the interior, where they can be modified by the large-scale circulations. This thesis studies the stability of an eastern boundary current with and without the large-scale flow influence in an idealized framework represented by barotropic quasi-geostrophic dynamics. The linear stability analysis of a meridional current with a continuous velocity profile shows that meridional eastern and western boundary currents support a limited number of radiating modes with long meridional and zonal wavelengths and small growth rates. However, the linearly stable, long radiating modes of an eastern boundary current can become nonlinearly unstable by resonating with short trapped unstable modes. This phenomenon is clearly demonstrated in the weakly nonlinear simulations. Results suggest that linearly stable longwave modes deserve more attention when the radiating instability of a meridional boundary current is considered. A large-scale flow affects the short trapped unstable mode and long radiating mode through different mechanisms. The large-scale flow modifies the structure of the boundary current to stabilize or destabilize the unstable modes, leading to a meridionally localized maximum in the perturbation kinetic energy field. The shortwave mode is accelerated or decelerated by the meridional velocity adjustment of the large-scale flow to have an elongated or a squeezed meridional structure, which is confirmed both in a linear WKB analysis and in nonlinear simulations. The squeezed or elongated unstable mode detunes the nonlinear resonance with the longwave modes, which then become less energetic. These two modes show different meridional structures in kinetic energy field because of the different mechanisms. In spite of the model simplicity, these results can potentially explain the formation of the zonal jets observed in altimeter data, and indicate the influence of the large-scale wind-driven circulation on eastern boundary upwelling systems in the real ocean. Studies with more realistic configurations remain future challenges.
by Jinbo Wang.
Ph.D.
Mauritzen, Cecilie. "A study of the large scale circulation and water mass formation in the Nordic seas and Arctic ocean." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/59864.
Full textIncludes bibliographical references (leaves 205-212).
by Cecilie Mauritzen.
Ph.D.
Valdés, Rodrigo. "Analysis of Long-Term Changes in Annual and Seasonal Precipitation in Chile and Related Large-Scale Atmospheric Circulation Patterns." Thesis, The University of Arizona, 2014. http://hdl.handle.net/10150/323414.
Full textWang, Liping. "The dynamic role of ridges in a β-plane channel : towards understanding the dynamics of large scale circulation in the Southern Ocean." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/57741.
Full textHristova, Hristina G. "Stability of large-scale oceanic flows and the importance of non-local effects." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/52761.
Full textThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 207-211).
My thesis covers two general circulation problems that involve the stability of largescale oceanic flows and the importance of non-local effects. The first problem examines the stability of meridional boundary currents, which are found on both sides of most ocean basins because of the presence of continents. A linear stability analysis of a meridional boundary current on the beta-plane is performed using a quasi-geostrophic model in order to determine the existence of radiating instabilities, a type of instability that propagates energy away from its origin region by exciting Rossby waves and can thus act as a source of eddy energy for the ocean interior. It is found that radiating instabilities are commonly found in both eastern and western boundary currents. However, there are some significant dierences that make eastern boundary currents more interesting from a radiation point of view. They possess a larger number of radiating modes, characterized by horizontal wavenumbers which would make them appear like zonal jets as they propagate into the ocean interior. The second problem examines the circulation in a nonlinear thermally-forced twolayer quasi-geostrophic ocean. The only driving force for the circulation in the model is a cross-isopycnal flux parameterized as interface relaxation. This forcing is similar to the radiative damping used commonly in atmospheric models, except that it is applied to the ocean circulation in a closed basin and is meant to represent the large-scale thermal forcing acting on the oceans.
(cont.) It is found that in the strongly nonlinear regime a substantial, not directly thermally-driven barotropic circulation is generated. Its variability in the limit of weak bottom drag is dominated by highfrequency barotropic basin modes. It is demonstrated that the excitation of basin normal modes has significant consequences for the mean state of the system and its variability, conclusions that are likely to apply for any other system whose variability is dominated by basin modes, no matter the forcing. A linear stability analysis performed on a wind- and a thermally-forced double-gyre circulation reveals that under certain conditions the basin modes can arise from local instabilities of the flow.
by Hristina G. Hristova.
Ph.D.
Vieira, Agudelo Sara C. "Temporal variations of monsoon systems." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37224.
Full textBurton, Kenneth R. "Influence of Antarctic oscillation on intraseasonal variability of large-scale circulations over the Western North Pacific /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Mar%5FBurton.pdf.
Full textSotiropoulou, Georgia. "The Arctic Atmosphere : Interactions between clouds, boundary-layer turbulence and large-scale circulation." Doctoral thesis, Stockholms universitet, Meteorologiska institutionen (MISU), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-134525.
Full textAt the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 4: Manuscript.
Selkirk, Henry Box. "An investigation of 40-50 day large scale divergent circulations in the tropical troposphere." Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/58331.
Full textMicrofiche copy available in Archives and Science.
Bibliography: leaves 273-281.
by Henry Box Selkirk.
Ph.D.
Burton, Kenneth R. Jr. "Influence of Antarctic oscillation on intraseasonal variability of large-scale circulations over the Western North Pacific." Thesis, Monterey California. Naval Postgraduate School, 2005. http://hdl.handle.net/10945/2310.
Full textThis study examines Southern Hemisphere mid-latitude wave variations connected to the Antarctic Oscillation (AAO) to establish connections with the 15- to 25-day wave activity in the western North Pacific monsoon trough region. The AAO index defined from the leading empirical orthogonal functions of 700 hPa height anomalies led to seven distinct circulation patterns that vary in conjunction with the 15- to 25-day monsoon trough mode. For nearly one half of the significant events the onset of 15- to 25-day monsoon trough convective activity coincided with a peak negative AAO index and the peak in monsoon trough convection coincided with a peak positive index. The remaining events either occur when the AAO is not significantly varying or when the AAO-related Southern Hemisphere mid-latitude circulations do not match 15- to 25-day transitions. When a significant connection occurs between the Southern Hemisphere mid-latitude circulations related to the AAO and the 15- to 25-day wave activity in the western North Pacific monsoon trough, the mechanism is via equatorward Rossby-wave dispersion. When wave energy flux in the Southern Hemisphere is directed zonally, no connection is established between the AAO and the alternating periods of enhanced and reduced convection in the western North Pacific monsoon trough.
Captain, United States Air Force
Lücke, Karsten [Verfasser]. "On the Influence of Mixing on the Performance of Large-Scale Atmospheric Circulating Fluidized Bed Combustors / Karsten Lücke." Aachen : Shaker, 2003. http://d-nb.info/1179023390/34.
Full textMaity, Rajib. "Impact Of Large-Scale Coupled Atmospheric-Oceanic Circulation On Hydrologic Variability And Uncertainty Through Hydroclimatic Teleconnection." Thesis, 2007. http://hdl.handle.net/2005/721.
Full textDe, Silva Sirilath J. "Statistical relationships between the mesoscale organization of convection, precipitation and the large-scale wind fields during the GATE." Thesis, 1990. http://hdl.handle.net/1957/28794.
Full textGraduation date: 1991
Elston, Susan Anne. "The "flickering switch" of calcium concentration in the Greenland ice core as an indicator of changes in large scale atmospheric circulation patterns." 1995. http://catalog.hathitrust.org/api/volumes/oclc/35098416.html.
Full textTypescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 105-164).