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青藏高原春季500 hPa纬向风季节内振荡特征及其与我国南方降水的关系
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基金项目:

公益性行业(气象)科研专项(GYHY201006020);国家自然科学基金(41275094);江苏高校优势学科建设工程(PAPD)项目;江苏省高校"青蓝工程"项目


Oscillation characteristics of 500 hPa zonal winds over the Tibetan Plateau in spring and its association with precipitation in south China
Author:
  • YANG Yan

    YANG Yan

    Key Laboratory of Meteorological Disaster of ministry of Education, Nanjing University of information Science & Technology, Nanjing 210044;School of Atmospheric Science, Nanjing University of information Science & Technology, Nanjing 210044;Zhengjiang Meteorological Bureau, Zhengjing 212003
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  • XU Haiming

    XU Haiming

    Key Laboratory of Meteorological Disaster of ministry of Education, Nanjing University of information Science & Technology, Nanjing 210044;School of Atmospheric Science, Nanjing University of information Science & Technology, Nanjing 210044;1. Key Laboratory of Meteorological Disaster of ministry of Education, Nanjing University of information Science & Technology, Nanjing 210044
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    摘要:

    利用NCEP/NCAR日平均再分析资料及中国753个测站日降水资料,采用带通滤波、小波功率谱、合成分析等方法研究了青藏高原春季500 hPa纬向风季节内振荡特征及其与我国南方降水的关系.结果表明,青藏高原春季500 hPa纬向风存在明显的10~30 d季节内振荡特征,该低频振荡主要表现为自西向东和自北向南的传播特征.通过位相合成分析发现,这种季节内振荡对我国南方春季降水有重要影响.当高原500 hPa纬向风季节内振荡处于2~3位相时(即高原上盛行西风异常),对应于我国南方地区春季降水明显偏多;反之,当季节内振荡处于相反位相时(6~7位相,即高原上盛行东风异常),对应于我国南方春季降水明显偏少.南方春季最大正(负)异常降水的出现滞后于高原季节内振荡的峰值(谷值)位相,其滞后时间为2 d.分析结果还表明,高原上空纬向风的季节内振荡活动主要通过中纬度大尺度环流异常对我国南方春季降水产生影响.

    Abstract:

    Using the wavelet power spectrum and composite analysis,the intraseasonal oscillation of 500 hPa zonal winds in spring over the Tibetan Plateau and its relationship to the precipitation in south China is studied,based on the daily NCEP/NCAR reanalysis and the daily precipitation dataset from 753 stations in China.Results reveal that the 10-30 d oscillation is the dominate period of the 500 hPa zonal wind variations over the Tibetan Plateau in spring season,characterized by its eastward propagation in zonal and southward propagation in meridional direction.Results also indicate that this 10-30 d intraseasonal oscillation is closely related to the spring precipitation over the south China.As the low-frequency oscillation over the Tibetan Plateau reaches its peak phase (phase 2-3,i.e.,westerly anomalies over the plateau),there will be positive precipitation anomalies in south China,and vice versa.In addition,the occurrence of the maximum (minimum) precipitation anomalies over south China is about 2 days lagged behind the peak (valley) phase of the intraseasonal oscillation over the plateau.Results further show that the intraseasonal oscillations of 500 hPa zonal wind over the Tibetan Plateau is highly related to an eastward-propagating wave train in the mid-high latitudes and through which the oscillation thus affects spring precipitation over south China.

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杨严,徐海明.青藏高原春季500 hPa纬向风季节内振荡特征及其与我国南方降水的关系[J].南京信息工程大学学报(自然科学版),2015,7(1):58-67
YANG Yan, XU Haiming. Oscillation characteristics of 500 hPa zonal winds over the Tibetan Plateau in spring and its association with precipitation in south China[J]. Journal of Nanjing University of Information Science & Technology, 2015,7(1):58-67

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  • 收稿日期:2013-11-27
  • 在线发布日期: 2015-02-12

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