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Analysis and Comparison of Mesoscale Convective Systems over the Qinghai-Xizang (Tibetan) Plateau


doi: 10.1007/BF02690789

  • A series of mesoscale convective systems (MCSs) occurred daily over the Qinghai-Xizang Plateau during25-28 July 1995. In this paper, their physical characteristics and evolutions based on infrared satelliteimagery, their largescale meteorological conditions, and convective available potential energy (CAPE) areanalyzed. It is found that similar diurnal evolution is present in all these MCSs. Their initial convectiveactivities became active at noon LST by solar heating, and then built up rapidly. They formed andreached a peak in the early evening hours around 1800 LST and then abated gradually. Among them, thestrongest and largest is the MCS on 26 July, which developed under the conditions of the great upper-levelnearly-circular Qinghai-Xizang anticyclonic high and driven by the strong low-level thermal forcing andconditional instability. All these conditions are intimately linked with the thermal effects of the plateauitself. So its development was mainly associated with the relatively pure thermal effects peculiar to theQinghai-Xizang Plateau. The next strongest one is the MCS on 28 July, which was affected notably by thebaroclinic zone linked with the westerly trough. There are different features and development mechanismsbetween these two strongest MCSs.
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    [2] Anjing HUANG, Gaopeng LU, Hongbo ZHANG, Feifan LIU, Yanfeng FAN, Baoyou ZHU, Jing YANG, Zhichao WANG, 2018: Locating Parent Lightning Strokes of Sprites Observed over a Mesoscale Convective System in Shandong Province, China, ADVANCES IN ATMOSPHERIC SCIENCES, 35, 1396-1414.  doi: 10.1007/s00376-018-7306-4
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    [6] Jing YANG, Gaopeng LU, Ningyu LIU, Haihua CUI, Yu WANG, Morris COHEN, 2017: Analysis of a Mesoscale Convective System that Produced a Single Sprite, ADVANCES IN ATMOSPHERIC SCIENCES, 34, 258-271.  doi: 10.1007/s00376-016-6092-0
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Manuscript History

Manuscript received: 10 May 2003
Manuscript revised: 10 May 2003
通讯作者: 陈斌, bchen63@163.com
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Analysis and Comparison of Mesoscale Convective Systems over the Qinghai-Xizang (Tibetan) Plateau

  • 1. Chinese Academy of Meteorological Sciences, Beijing 100081,National Key Laboratory for the Severe Storm Research LSSR, Peking University, Beijing 100871

Abstract: A series of mesoscale convective systems (MCSs) occurred daily over the Qinghai-Xizang Plateau during25-28 July 1995. In this paper, their physical characteristics and evolutions based on infrared satelliteimagery, their largescale meteorological conditions, and convective available potential energy (CAPE) areanalyzed. It is found that similar diurnal evolution is present in all these MCSs. Their initial convectiveactivities became active at noon LST by solar heating, and then built up rapidly. They formed andreached a peak in the early evening hours around 1800 LST and then abated gradually. Among them, thestrongest and largest is the MCS on 26 July, which developed under the conditions of the great upper-levelnearly-circular Qinghai-Xizang anticyclonic high and driven by the strong low-level thermal forcing andconditional instability. All these conditions are intimately linked with the thermal effects of the plateauitself. So its development was mainly associated with the relatively pure thermal effects peculiar to theQinghai-Xizang Plateau. The next strongest one is the MCS on 28 July, which was affected notably by thebaroclinic zone linked with the westerly trough. There are different features and development mechanismsbetween these two strongest MCSs.

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