“7．17”西北夏季沙尘暴数值模拟  

Numerical Simulation of "7.17" Sand-dust Storm in Northwest China

作　　者：赵建华[1,2] 张强[1,2] 李耀辉[1] 刘世祥[1] 隆霄[2] 

机构地区：[1]中国气象局兰州干旱气象研究所,甘肃省干旱气候变化与减灾重点实验室,甘肃兰州730020 [2]兰州大学大气科学学院,甘肃兰州730000

出　　处：《中国沙漠》2009年第6期1221-1228,共8页Journal of Desert Research

基　　金：国家重点基础研究发展计划“973”项目(2008CB417213);国家自然科学基金项目(40645027)资助

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。A sand-dust storm which occurred over northwest China on Jul 17, 2005 was known as me 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.

关 键 词：沙尘暴 起沙 涡叠加 

分 类 号：P445.4[天文地球—大气科学及气象学]