“7.17”西北夏季沙尘暴数值模拟

摘要/Abstract

摘要： 对2005年7月17日发生在西北地区近20 a来夏季最强的沙尘暴过程进行了数值模拟研究,结果得到:①沙尘暴发生前,沙源处于高温控制下;②起沙是水平低涡和垂直涡叠加而成的一种类似于Benard对流泡的系统扫掠沙源的结果;③起沙主要发生在水平低涡移动方向的右部。

关键词: 沙尘暴, 起沙, 涡叠加

Abstract: A sand-dust storm which occurred over northwest China on Jul 17, 2005 was known as the severest one in summer of the recent 20 years. It was simulated by dust model-GRAPES_SDM with purpose of finding out its potential starting mechanism. The results show that ①the dust source area was dominated by high temperature before the sand-dust storm occurrence; ②dust emission was resulted from the sediments being swept by the superposed flow of horizontal low vortex and vertical vortex which coupled into a cell resembling to well-known Benard convective cell; ③dust emission mainly occurred at the right of the moving orientations of the horizontal low vortex.

Key words: dust storm, dust emissions, superposition of vortices

中图分类号:

P445.4

赵建华;张强;李耀辉;刘世祥;隆霄. “7.17”西北夏季沙尘暴数值模拟[J]. 中国沙漠, 2009, 29(6): 1221-1228.

ZHAO Jian-hua;ZHANG Qiang;LI Yao-hui;LIU Shi-xiang;LONG Xiao. Numerical Simulation of “7.17” Sand-dust Storm in Northwest China[J]. JOURNAL OF DESERT RESEARCH, 2009, 29(6): 1221-1228.

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