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A Diagnostic Study of Record Heavy Rain in Twin Cities Islāmābad-Rāwalpindi

Advances in Atmospheric Sciences 2004年第6期21卷 976-988页

作者： Ghulam RASUL Qamar-uz-Zaman CHAUDHRY 赵思雄曾庆存 Meteorological Service of Pakistan P. O. Box 1214 Islāamāabad-Pakistan Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 Graduate School Chinese Academy of Sciences Beijing 100039

Using surface and NCEP reanalysis data along with radar and satellite images, diagnosis has been carried out to probe the reasons for the very heavy rainfall that occurred in Islāmābad-Rāwalpindi on 23 July 2001. It has been revealed that the sudden evolution of this meso-scale severe weather system was the direct result of strong surface convection in moist and unstable lower layers of the atmosphere. The subsequent rapid development was the combined effect of the presence of the mid latitude westerly’s trough in the north and moisture feeding through monsoon flow along the Himalayas and also the direct south-westerly current from the Arabian Sea. After the westward shifting of the Sub-Tropical High (STH) from the north of India, the strong divergence zone on its eastern edge contributed positively to the development of upward motion. Initially the convective systems moved towards the south and then southeastward following the steering current in the middle troposphere. Based on these analyses, the physical model of the sudden record heavy rainfall has been proposed and a comparison between the heavy rainfall in this case and one in China has been conducted.

关键词： monsoon circulation mesoscale systems heavy rainfall

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A Study of Influencing systems and Moisture Budget in a Heavy Rainfall in Low Latitude Plateau in China during Early Summer

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Advances in Atmospheric Sciences 2007年第3期24卷 485-502页

作者：董海萍赵思雄曾庆存 Institute of Atmospheric Physics Chinese Academy of Sciences

Analysis of a heavy rainfall in a lower latitude plateau and characteristics of water vapor transportation have been conducted by using conventional data and denser surface data. The results show：（1） the heavy rainfall was caused by a series of mesoscale systems under favorable large-scale conditions when the warm moister air and cold air interacted with each other. At the same time, the coupling between the upper- and lower-level jets was revealed. It is also found that there exists some different characteristics among the main influencing systems of heavy rainfalls in Yunnan, such as the Indian-Myanmar trough and the path of the cold air, compared with those in East and South China. （2） The interaction between mesoscale convergence lines near the ground may be a possible triggering mechanism for the occurrence of mesoscale systems, and the dynamical and thermal dynamical structure of the mesoscale systems was very obvious. The convergence lines may relate closely to the terrain of Yunnan, China. （3） The computation of the water vapor budget reveals that the primary source of water vapor supply for heavy rainfall was in the Bay of Bengal. In this case, the water vapor could be transported into Yunnan even though the amount of water vapor was less than that in the lower troposphere in East and South China. In addition, the analysis for three-dimensional air parcel trajectories better revealed and described the source location and the transportation of water vapor to Yunnan.

关键词： heavy rainfall mesoscale systems moisture budget Yunnan-Guizhou Plateau

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A Study of Influencing systems and Moisture Budget in a Heavy Rainfall in Low Latitude Plateau in China during Early Summer

A Study of Influencing Systems and Moisture Budget in a Heav...

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作者：董海萍赵思雄曾庆存 Institute of Atmospheric Physics Chinese Academy of Sciences Craduate University of the Chinese Academy of Scienees Air Force Meteorological Center

Analysis of a heavy rainfall in a lower latitude plateau and characteristics of water vapor transportation have been conducted by using conventional data and denser surface *** results show:(1) the heavy rainfall was caused by a series of mesoscale systems under favorable large-scale conditions when the warm moister air and cold air interacted with each *** the same time,the coupling between the upper- and lower-level jets was *** is also found that there exists some different characteristics among the main influencing systems of heavy rainfalls in Yunnan,such as the Indian-Myanmar trough and the path of the cold air,compared with those in East and South China.(2) The interaction between niesoscale convergence lines near the ground may be a possible triggering mechanism for the occurrence of mesoscale systems,and the dynamical and thermal dynamical structure of the mesoscale systems was very *** convergence lines may relate closely to the terrain of Yunnan,China.(3) The computation of the water vapor budget reveals that the primary source of water vapor supply for heavy rainfall was in the Bay of *** this case,the water vapor could be transported into Yunnan even though the amount of water vapor was less than that in the lower troposphere in East and South *** addition,the analysis for three-dimensional air parcel trajectories better revealed and described the source location and the transportation of water vapor to Yunnan.

关键词： heavy rainfall mesoscale systems moisture budget Yunnan-Guizhou Plateau

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A Study of Influencing systems and Moisture Budget in a Heavy Rainfall in Low Latitude Plateau in China during Early Summer

A Study of Influencing Systems and Moisture Budget in a Heav...

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作者：董海萍赵思雄曾庆存 Institute of Atmospheric Physics Chinese Academy of Sciences Graduate University of the Chinese Academy of Sciences Air Force Meteorological Center

Analysis of a heavy rainfall in a lower latitude plateau and characteristics of water vapor transportation have been conducted by using conventional data and denser surface *** results show:(1) the heavy rainfall was caused by a series of mesoscale systems under favorable large-scale conditions when the warm moister air and cold air interacted with each *** the same time,the coupling between the upper- and lower-level jets was *** is also found that there exists some different characteristics among the main influencing systems of heavy rainfalls in Yunnan,such as the Indian-Myanmar trough and the path of the cold air,compared with those in East and South China.(2) The interaction between mesoscale convergence lines near the ground may be a possible triggering mechanism for the occurrence of mesoscale systems,and the dynamical and thermal dynamical structure of the mesoscale systems was very *** convergence lines may relate closely to the terrain of Yunnan,China.(3) The computation of the water vapor budget reveals that the primary source of water vapor supply for heavy rainfall was in the Bay of *** this case,the water vapor could be transported into Yunnan even though the amount of water vapor was less than that in the lower troposphere in East and South *** addition,the analysis for three-dimensional air parcel trajectories better revealed and described the source location and the transportation of water vapor to Yunnan.

关键词： heavy rainfall mesoscale systems moisture budget Yunnan-Guizhou Plateau

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