自然资源学报 ›› 2014, Vol. 29 ›› Issue (1): 117-128.doi: 10.11849/zrzyxb.2014.01.011

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青藏高原夏季500hPa纬向风昼夜差异及其影响

朱丽华, 范广洲, 周定文   

  1. 成都信息工程学院大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225
  • 收稿日期:2012-05-22 修回日期:2013-08-22 出版日期:2014-01-20 发布日期:2014-01-09
  • 作者简介:朱丽华(1981- ),女,山东聊城人,助教,硕士,主要从事气候变化及其数值模拟研究。E-mail:zhulh@cuit.edu.cn
  • 基金资助:
    国家自然科学基金面上项目(41275079);四川省青年科技基金项目(2012JQ0062);成都信息工程学院校选项目(CRF201201)

Diurnal Variation of 500 hPa Zonal Wind in Summer over the Tibetan Plateau and Analysis of Its Impact

ZHU Li-hua, FAN Guang-zhou, ZHOU Ding-wen   

  1. Academy of Atmospheric Sciences, Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu University of Information Technology, Chengdu 610225, China
  • Received:2012-05-22 Revised:2013-08-22 Online:2014-01-20 Published:2014-01-09

摘要: 论文利用NCEP/NCAR再分析资料及中国142 个测站12 小时降水资料,采用线性倾向估计、合成分析、相关分析等方法,对青藏高原夏季500 hPa 纬向风的昼夜变化特征及其影响进行了分析。结果表明:自1950 年以来,高原夏季500 hPa 昼、夜纬向风均呈现整体减弱趋势,且减弱趋势夜间比白天明显,纬向风日较差呈增大趋势。高原昼、夜纬向风在1967 年均存在减弱突变,纬向风日较差存在1965 年的减小突变和1975 年的增大突变,纬向风日较差具有4~6 a 及16~23 a 的显著周期。高原昼夜纬向风异常,使得高原东侧及其以东地区出现异常的上升或下沉气流,且高原纬向风减弱时,长江以北的我国大部分地区降水偏少,长江以南地区降水偏多,降水对高原纬向风异常响应的昼夜差异主要表现在四川盆地东西部降水异常的昼夜差异上。

关键词: 气候变化, 青藏高原, 降水, 纬向风, 昼夜差异, 环流

Abstract: Using the linear-trend estimate, composition and correlation analysis, the diurnal variability of the 500 hPa zonal wind in summer over the Tibetan Plateau and its impact are examined, based on the NCAR/NCEP reanalysis and the twice-daily precipitation data from 142 stations in China. The results reveal that: 500 hPa zonal wind at day and night in summer over the Tibetan Plateau overall show a decreasing trend since 1950, and it is more notable at night. The daily range of zonal wind show a decreasing trend. Zonal winds at day and night over the Tibetan Plateau all have a pronounced abrupt weakening occuring in 1967. The diurnal changes of zonal wind over the Tibetan Plateau have pronounced abrupt reduction occuring in 1965 and greater occuring in 1975. The diurnal change of zonal wind presents the periods about 4-6 years and 16-23 years. When the zonal wind is abnormal, anomalous ascending or descending flow are found at the east flank of the plateau and areas east of it. When the zonal wind decreases, less precipitation happens in areas north of the Yangtze River, while more precipitation happens in areas south of it. The diurnal variation of response of precipitation to anomalous zonal wind over the Tibetan Plateau is mainly in diurnal variation of the anomalous precipitation over the eastern and the western Sichuan Basin.

Key words: zonal wind, Tibetan Plateau, precipitation, climatic variation, diurnal variation, circulation

中图分类号: 

  • P467