干旱气象

• 论文 • 上一篇    下一篇

河西走廊一次强沙尘暴天气的螺旋度诊断

程鹏1,2王宝鉴2孔祥伟2张静2伏晓红2宋秀玲2   

  1. 1. 甘肃省庆阳市气象局,甘肃西峰745000; 2. 兰州中心气象台,甘肃兰州730020
  • 收稿日期:2012-03-12 修回日期:2012-10-15 出版日期:2013-03-30 发布日期:2013-03-01
  • 作者简介: 程鹏( 1981 - ) ,男,工程师,主要从事灾害性天气及短临预报研究. E - mail: tfreefish@163. com
  • 基金资助:

    中国气象局预报员专项( CMAYBY2012 - 064) 资助

Diagnostic Analysis of the Helicity During a Heavy Dust Storm Weather Process in Hexi Corridor

CHENG Peng1,2WANG Baojian2KONG Xiangwei2ZHANG Jing2FU Xiaohong2SONG Xiulin2   

  1. 1. Qingyang Meteorological Bureau of Gansu Province,Xifeng 745000,China;
    2. Lanzhou Central Meteorological Observatory,Lanzhou 730020,China
  • Received:2012-03-12 Revised:2012-10-15 Online:2013-03-30 Published:2013-03-01

摘要:

应用NCEP 再分析资料计算了螺旋度,通过总螺旋度、螺旋度的水平和垂直分布特征对河西走廊一次区域性强沙尘暴天气进行了诊断分析。结果表明: 沙尘区位于总螺旋度负值区或零线附近;沙尘暴爆发区水平螺旋度高层300 hPa 为负螺旋度控制,低层700 hPa 为正螺旋度控制; 在沙尘暴发生时,高层负螺旋度中心有一个明显增大的过程,沙尘暴爆发区对应高空低层螺旋度强梯度区内; 沙尘暴爆发区的垂直螺旋度分布特征是上负下正; 螺旋度对沙尘暴爆发区有较好的指示意义。

关键词: 沙尘暴, 总螺旋度, 螺旋度, 河西走廊

Abstract:

Based on the reanalysis data of NCEP,a regional storng dust storm in Hexi corridor was analyzed from the horizontal and vertical distribution characteristics of the total helicity and helicity. The results showed that the dust storm occurred in the intensive isoline or the zeroline of the negative helicity area. There was the negative helicity at 300 hPa and the positive helicity at 700 hPa over duststorm area. The negative center of the helicity was growing obviously with the outbreak of the duststorm. The vertical helicity distribution characteristic was negative at the high level and positive at the low level. The helicity indicated the outbreak area of dust storm very
well.

Key words: dust storm, total helicity, helicity, Hexi Corridor

中图分类号: