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中国沙漠 ›› 2004, Vol. 24 ›› Issue (6): 701-705.

• 研究论文 • 上一篇    下一篇

宁夏中北部地区沙尘暴天气发生过程中的不稳定条件分析

郑广芬, 赵光平, 李艳春, 林莉, 陈豫英   

  1. 宁夏气象防灾减灾重点实验室, 宁夏 银川 750002
  • 收稿日期:2003-05-06 修回日期:2003-09-11 出版日期:2004-12-20 发布日期:2004-12-20
  • 作者简介:郑广芬(1964-),女(汉族),河北献县人,高级工程师,南京气象学院在读研究生,主要从事气候及短期气候预测研究。E-mail:ych_zgf@163.com
  • 基金资助:
    宁夏自然科学基金项目(A1017); 国家自然科学基金项目(40065002)共同资助

Analysis on Unstable Condition in Sandstorm Processes in Middle and North Area of Ningxia

ZHENG Guang-fen, ZHAO Guang-ping, LI Yan-chun, LIN Li, CHUN Yu-ying   

  1. The Key Meteorological Laboratory for Disaster Prevention and Alleviation in Ningxia, Yinchuan 750002, China
  • Received:2003-05-06 Revised:2003-09-11 Online:2004-12-20 Published:2004-12-20

摘要: 从沙尘暴的形成条件入手, 对宁夏中北部地区近30a来沙尘暴天气发生过程中的不稳定条件进行了较为详尽的分析。结果表明: 沙尘暴发生前, 大气的不稳定性明显增强; 沙尘暴天气发生时不稳定性主要发生在700hPa以下, 最为突出的是850hPa以下; 沙尘暴发生过程中不稳定性达到最强。

关键词: 宁夏中北部, 沙尘暴天气, 不稳定条件

Abstract: The atmospheric stability in the processes of sandstorm taking place in the middle and north area of Ningxia was classified by using the P-T method and based on the general weather data for 30 years. Meantime the Richardson parameters of each altitude were computed. The atmospheric instability became more obvious just before sandstorm, and it mainly took place at altitude below 700 hPa, especially below 850 hPa. The atmospheric instability has already occurred at least one day before sandstorm taking place, and the long time accumulative process the long persisting time of strong sandstorm. The abruptly happened sandstorm rapidly accumulated its unstable energy before its happening. When the energy became the strongest, sandstorm took place. The atmospheric instability will gradually disappear after sandstorm ending.

Key words: the middle and north area of Ningxia, sand-storm weather, unstable condition

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