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

ZHU Guofu; CHEN Shoujun

doi:10.1007/BF02690789

Impact Factor: 5.8

Volume 20 Issue 3

May 2003

Article Contents

Article > ADVANCES IN ATMOSPHERIC SCIENCES > 2003 > 20(3): 311-322

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

doi: 10.1007/BF02690789

Abstract
References
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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.
- Qinghai-Xizang (Tibetan) Plateau,
- mesoscale convective system (MCS),
- convective availablepotential energy (CAPE)
References

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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

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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

Manuscript received: 2003-05-10
Manuscript revised: 2003-05-10

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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