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中国沙漠 ›› 2004, Vol. 24 ›› Issue (1): 83-87.

• 研究论文 • 上一篇    下一篇

螺旋度在一次强沙尘暴天气分析中的应用

陶健红1, 王劲松2, 冯建英2   

  1. 1. 南京气象学院, 江苏 南京 210044;
    2. 中国气象局 兰州干旱气象研究所, 甘肃 兰州 730020
  • 收稿日期:2003-05-08 修回日期:2003-06-11 出版日期:2004-02-20 发布日期:2004-02-20
  • 作者简介:陶健红(1968-),男(汉族),甘肃临夏人,高级工程师,主要从事中尺度天气和干旱气候研究。E-mail:taojh@gsma.gov.cn
  • 基金资助:
    中国科技部项目"西北干旱区沙尘暴预警、服务系统研究"之子专题 沙尘暴短期综合预报方法及业务化研究

Applying of Helicity in Analysis of a Severe Sandstorm

TAO Jian-hong1, WANG Jin-song2, FENG Jian-ying2   

  1. 1. Nanjing College of Meteorology, Nanjing 210044, China;
    2. Institute of Arid Meteorology, China Meteorology Administration, Lanzhou 730020, China
  • Received:2003-05-08 Revised:2003-06-11 Online:2004-02-20 Published:2004-02-20

摘要: 利用NCEP/NCAR每日4次全球再分析网格点资料, 对发生在中国西北的一次强沙尘暴进行了螺旋度的诊断分析。结果表明: 螺旋度作为强对流天气分析预报中的一个重要物理量, 在沙尘暴的预报中同样具有很好的指示意义。沙尘暴区上空螺旋度垂直分布为高层负值, 低层正值。高层螺旋度负值的演变与沙尘暴的出现有一定的对应关系。

关键词: 螺旋度, 西北地区, 沙尘暴

Abstract: The helicity of a severe sandstorm happened in Northwest China was analyzed by using global reanalysis grid data of NCEP/NCAR for 4 times a day. As an important physical parameter in analyzing and predicting strong convective weather, the helicity also has good indication in the forecasting of sandstorm. The distribution of helicity over the sandstorm area was negative at higher levels and positive at lower levels. There was definite relationship between the evolvement of helicity's negative value at higher levels and the occurrence of sandstorm.

Key words: helicity, Northwest China, sandstorm

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