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Relevant bibliographies by topics / Atmospheric circulation Vietnam Charts

Academic literature on the topic 'Atmospheric circulation Vietnam Charts'

Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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Journal articles on the topic "Atmospheric circulation Vietnam Charts"

1

RAJEEVAN, M., and P. P. BUTALA. "A preliminary study on the variability of post monsoon Tropical cyclone activity over the north Indian Ocean." MAUSAM 41, no. 3 (February 24, 2022): 71–76. http://dx.doi.org/10.54302/mausam.v41i3.2724.

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By the composite method, the long period seasonal mean charts of flow features at 850 hPa and 200 hPa, vertical wind shear and monthly (September) mean charts of SST anomaly for periods with large term activity and small storm activity were constructed to examine the circulation features associated with inter-annual variability of post monsoon (October-December) tropical cyclone activity over the north Indian Ocean. It was found that the prominent circulation features for the periods with small storm activity are: Absence of ITCZ at 850 hPa north of 5°N, weaker upper level subtropical westerlies, southward shift of 200 hPa ridge and relatively larger vertical wind shear over most of the oceanic area. Negative SST anomalies during the month of September also tend to be unfavorable for the formation of storms. A hypothesis is made for the causes of these circulation changes and SST anomalies. Changes in intensity of monsoon circulation. Cause to develop SST anomalies. These SST anomalies affect the atmosphere by large scale ocean-atmospheric interaction and thus creates an environment favorable or unfavorable for storm development.

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2

Phan-Van, Tan, Thanh Nguyen-Xuan, Hiep Van Nguyen, Patrick Laux, Ha Pham-Thanh, and Thanh Ngo-Duc. "Evaluation of the NCEP Climate Forecast System and Its Downscaling for Seasonal Rainfall Prediction over Vietnam." Weather and Forecasting 33, no. 3 (April 25, 2018): 615–40. http://dx.doi.org/10.1175/waf-d-17-0098.1.

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Abstract This study investigates the ability to apply National Centers for Environmental Prediction (NCEP) Climate Forecast System (CFS) products and their downscaling by using the Regional Climate Model version 4.2 (RegCM4.2) on seasonal rainfall forecasts over Vietnam. First, the CFS hindcasts (CFS_Rfc) from 1982 to 2009 are used to assess the ability of the CFS to predict the overall circulation and precipitation patterns at forecast lead times of up to 6 months. Second, the operational CFS forecasts (CFS_Ope) and its RegCM4.2 downscaling (RegCM_CFS) for the period 2012–14 are used to derive seasonal rainfall forecasts over Vietnam. The CFS_Rfc and CFS_Ope are validated against the ECMWF interim reanalysis, the Global Precipitation Climatology Centre (GPCC) analyzed rainfall, and observations from 150 meteorological stations across Vietnam. The results show that the CFS_Rfc can capture the seasonal variability of the Asian monsoon circulation and rainfall distribution. The higher-resolution RegCM_CFS product is advantageous over the raw CFS in specific climatic subregions during the transitional, dry, and rainy seasons, particularly in the northern part of Vietnam in January and in the country’s central highlands during July.

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3

SINGH, M. S. "Upper Air Circulation associated with a Western Disturbance." MAUSAM 14, no. 2 (March 4, 2022): 156–72. http://dx.doi.org/10.54302/mausam.v14i2.5320.

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Upper tropospheric circulation associated with the development of a western disturbance, which was active over India and Pakistan from 28 to 31, December 1960 has been studied with the help of the Asian charts. It was observed that between 26th and 28th a meridional type circulation developed at 300-mb level in the Middle-East and the South-Russian Region. As a result, the upper air trough in the westerlies extended deep into the north, Arabian Sea and a strong northwesterly Jet developed upstream of this trough by the 28th. It was on this day that a feeble western disturbance aolng Makran coast intensified. On the 29th the meridional circulation at 360-mb level was destroyed. Probable causes of these developments in the upper air as well as at the surface have been discussed.

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4

SASTRY, J. S., and R. S. D'SOUZA. "Oceanography of the Arabian Sea during the southwest monsoon season Part II: Stratification and circulation." MAUSAM 22, no. 1 (November 17, 2021): 23–32. http://dx.doi.org/10.54302/mausam.v22i1.3980.

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The distribution of mass in the Arabian Sea during the southwest monsoon season, 1963 is presented through several vertical sections and spatial distribution charts of the thermosteric anomaly. The circulation patterns in the upper 200 m are derived. The basic feature of circulation is found to be the formation of several cyclonic and anti-cyclonic cells. Upwelling off the southwest coast of India has been explained on a more rational basis than has been assumed hitherto. It is now attributed partly due to the divergence in the current field and partly due to the cyclonic motion around Laccadive and Maldive Island.

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5

DE, US. "An objective method for forecasting five-day rainfall over Delhi during July and August." MAUSAM 18, no. 3 (April 30, 2022): 355–62. http://dx.doi.org/10.54302/mausam.v18i3.4620.

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The present study is an attempt to evolve a technique for forecasting pentad rainfall over Delhi for the month of July and August. Composite charts for conditions antecedent to excessive and deficient rainfall, during the pentad under consideration, are prepared. The contrasting features of the circulation patterns revealed in these composite charts are taken as guides to picking up crucial station pairs whose relative heights could be taken as representative of the contrasting features. From dot diagrams of rainfall character (as A,' N and S) and pairs of pressure-height co-ordinates the relationship between the predictor and predictant are worked out on the basis of contingency technique. The forecast scheme gives a skill score of. 55.

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6

ROY, A. K., and N. C. RAI SIRCAR. "On the utility of plotting vectorial changes of upper winds in forecasting developments and progress of Important pressure systems." MAUSAM 6, no. 2 (December 3, 2021): 97–118. http://dx.doi.org/10.54302/mausam.v6i2.4429.

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A study has been made to find the usefulness, for forecasting purposes, of a critical examination of the 24-hour variations in the flow pattern of winds by plotting systematically vectorial changes of upper winds. It is seen that such charts by providing a more definite picture of changes in the circulation pattern of winds, give an insight into the future trend of events in relation to developments of Important synoptic situation, such as, the origin and movements of depressions or of storms in the sea areas, formation of secondaries of western disturbances etc more readily and clearly than what IS possible from a study of two consecutive wind charts.

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7

DE, U. S., R. N. KESHAVAMURTY, K. S. JOSHI, D. V. VAIDYA, P. V. PILLAI, R. CHELLAPA, and S. K. DAS. "An objective method of weekly rainfall anomaly over central India." MAUSAM 29, no. 1 (February 26, 2022): 397–402. http://dx.doi.org/10.54302/mausam.v29i1.2905.

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The present investigation is an attempt to evolve a technique for forecasting weekly rainfall anomaly over central India (east and west Madhya Pradesh and Vidarbha). Composite circulation anomaly charts for conditions antecedent to active and weak monsoon spells were used as guides to pick up parameters of predictive value, like the zonal wind shear over Peninsula in the lower and middle tropospheres. A relationship using contingency technique has been used to prepare a forecast scheme. Testing of the scheme on independent data yields encouraging results.

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8

Chen, Tsing-Chang, Shih-Yu Wang, Ming-Cheng Yen, and Adam J. Clark. "Impact of the Intraseasonal Variability of the Western North Pacific Large-Scale Circulation on Tropical Cyclone Tracks." Weather and Forecasting 24, no. 3 (June 1, 2009): 646–66. http://dx.doi.org/10.1175/2008waf2222186.1.

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Abstract The life cycle of the Southeast Asian–western North Pacific monsoon circulation is established by the northward migrations of the monsoon trough and the western Pacific subtropical anticyclone, and is reflected by the intraseasonal variations of monsoon westerlies and trade easterlies in the form of an east–west seesaw oscillation. In this paper, an effort is made to disclose the influence of this monsoon circulation on tropical cyclone tracks during its different phases using composite charts of large-scale circulation for certain types of tracks. A majority of straight-moving (recurving) tropical cyclones appear during weak (strong) monsoon westerlies and strong (weak) trade easterlies. The monsoon conditions associated with straight-moving tropical cyclones are linked to the intensified subtropical anticyclone, while that associated with recurving tropical cyclones is coupled with the deepened monsoon trough. The relationship between genesis locations and track characteristics is evolved from the intraseasonal variation of the monsoon circulation reflected by the east–west oscillation of monsoon westerlies and trade easterlies. Composite circulation differences between the flows associated with the two types of tropical cyclone tracks show a vertically uniform short wave train along the North Pacific rim, as portrayed by the Pacific–Japan oscillation. During the extreme phases of the monsoon life cycle, the anomalous circulation pattern east of Taiwan resembles this anomalous short wave train. A vorticity budget analysis of the strong monsoon condition reveals a vorticity tendency dipole with a positive zone to the north and a negative zone to the south of the deepened monsoon trough. This meridional juxtaposition of vorticity tendency propagates the monsoon trough northward. The interaction of a tropical cyclone with the monsoon trough intensifies the north–south juxtaposition of the vorticity tendency and deflects the tropical cyclone northward. In contrast, during weak monsoon conditions, the interaction between a tropical cyclone and the subtropical high results in a northwestward motion steered by the intensified trade easterlies. The accurate prediction of the monsoon trough and the subtropical anticyclone variations coupled with the monsoon life cycle may help to improve the forecasting of tropical cyclone tracks.

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9

Tam, Chi-Yung, and Ngar-Cheung Lau. "The Impact of ENSO on Atmospheric Intraseasonal Variability as Inferred from Observations and GCM Simulations." Journal of Climate 18, no. 12 (June 15, 2005): 1902–24. http://dx.doi.org/10.1175/jcli3399.1.

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Abstract The impact of the El Niño–Southern Oscillation (ENSO) on the atmospheric intraseasonal variability in the North Pacific is assessed, with emphasis on how ENSO modulates midlatitude circulation anomalies associated with the Madden–Julian oscillation (MJO) in the Tropics and the westward-traveling patterns (WTP) in high latitudes. The database for this study consists of the output of a general circulation model (GCM) experiment subjected to temporally varying sea surface temperature (SST) forcing in the tropical Pacific, and observational reanalysis products. Diagnosis of the GCM experiment indicates a key region in the North Pacific over which the year-to-year variation of intraseasonal activity is sensitive to the SST conditions in the Tropics. In both the simulated and observed atmospheres, the development phase of the dominant circulation anomaly in this region is characterized by incoming wave activity from northeast Asia and the subtropical western Pacific. Southeastward dispersion from the North Pacific to North America can be found in later phases of the life cycle of the anomaly. The spatial pattern of this recurrent extratropical anomaly contains regional features that are similar to those appearing in composite charts for prominent episodes of the MJO and the WTP. Both the GCM and reanalysis data indicate that the amplitude of intraseasonal variability near the key region, as well as incoming wave activity in the western Pacific and dispersion to the western United States, are enhanced in cold ENSO events as compared to warm events. Similar modulations of the MJO-related circulation patterns in the extratropics by ENSO forcing are discernible in the model simulation. It is inferred from these findings that ENSO can influence the North Pacific intraseasonal activity through its effects on the evolution of convective anomalies in the tropical western Pacific. On the other hand, there is little modification by ENSO of the circulation features associated with the WTP. The combined effect of the MJO and WTP on the intraseasonal circulation in the North Pacific is studied. Based on multiple regression analysis, it is found that the MJO and WTP make comparable contributions to the variability in the midlatitude North Pacific. These contributions may be treated as a linear combination of the anomalies attributed to the MJO and WTP separately.

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10

Yang, Yiya, Renguang Wu, and Chenghai Wang. "Individual and Combined Impacts of Tropical Indo-Pacific SST Anomalies on Interannual Variation of the Indochina Peninsular Precipitation." Journal of Climate 33, no. 3 (February 1, 2020): 1069–88. http://dx.doi.org/10.1175/jcli-d-19-0262.1.

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AbstractThis study documents interannual rainfall variations over the Indochina Peninsula (ICP) during the rainy season and individual and combined influences of tropical Indo-Pacific sea surface temperature (SST) anomalies. The rainfall variability is large along the west coast in May–June, along the west coast and over the eastern mountains in July–August, and along the central Vietnam coast in September–November. More rainfall in May–June, July–August, and October–November occurs in the La Niña decaying years, La Niña decaying years and/or El Niño developing years, and La Niña developing years, respectively. The May–June rainfall variation along the west coast is associated with equatorial central-eastern Pacific (EP), south Indian Ocean, and western North Pacific SST anomalies. The July–August rainfall variation along the west coast and over the eastern mountains is related to equatorial central Pacific and tropical southeastern Indian Ocean SST anomalies. The October–November rainfall variation along the central Vietnam coast is affected by EP and tropical western Indian Ocean SST anomalies. The EP and tropical western Indian Ocean SST influence is through anomalous Walker circulation. The south Indian Ocean SST influence is via cross-equatorial flows. The tropical southeastern Indian Ocean SST influence is via an anomalous cross-equatorial overturning circulation. The equatorial central Pacific and western North Pacific SST influence is via a Rossby wave–type response. The analysis illustrates the importance of combined effects of regional SST anomalies on the ICP precipitation variation in different stages of the rainy season. Numerical experiments with SST anomalies imposed in different regions confirm the combined effects of the Indo-Pacific SST anomalies on the ICP rainfall variation.

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Books on the topic "Atmospheric circulation Vietnam Charts"

1

Osuchowska-Klein, Blanka. Katalog typów cyrkulacji atmosferycznej, 1976-1990. Warszawa: Instytut Meteorologii i Gospodarki Wodnej, 1991.

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2

Stępniewska-Podrażka, Maria. Kalendarz typów cyrkulacji atmosferycznej, 1951-1990. Warszawa: Instytut Meteorologii Gospodarki Wodnej, 1991.

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3

Dubicka, Maria. Wpływ cyrkulacji atmosfery na kształtowanie warunków klimatu (na przykładzie Wrocławia). Wrocław: Wydawn. Uniwersytetu Wrocławskiego, 1994.

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4

N, Krenke A., and Akademii͡a︡ nauk SSSR. Mezhduvedomstvennyĭ geofizicheskiĭ komitet. Sekt͡s︡ii͡a︡ fiziki atmosfery i meteorologii., eds. Krupnomasshtabnye atmosfernye prot͡s︡essy na Severnom polusharii i klimaticheskie ėkstremumy na evropeĭskoĭ territorii SSSR: [otvetstvennyĭ redaktor A.N. Krenke] =. Moskva: Mezhduvedomstvennyĭ geofizicheskiĭ kom-t AN SSSR, 1987.

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5

Sinopticheskiĭ bi͡u︡lletenʹ: Severnoe polusharie. Obninsk: Gos. kom-t SSSR po gidrometeorologii, 1990.

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