论文

青藏高原冬春雪深年代际变化与南亚高压可能联系

  • 周利敏 ,
  • 陈海山 ,
  • 彭丽霞 ,
  • 许蓓
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  • 山西省大同市气象局, 大同 037010;2. 南京信息工程大学气象灾害预报预警与评估协同创新中心, 气象灾害教育部重点实验室, 南京 210044;3. 南京信息工程大学大气科学学院, 南京 210044

收稿日期: 2014-05-05

  网络出版日期: 2016-02-28

基金资助

科技部公益性行业(气象)科研专项(GYHY201206017,GYHY201306028);国家自然科学基金项目(41230422,41105059);江苏省自然科学基金杰出青年项目(BK20130047);新世纪优秀人才支持计划;江苏省高校自然科学研究项目(11KJB170006)

Possible Connection between Interdecadal Variations of Snow Depth in Winter and Spring over Qinghai-Xizang Plateau and South Asia High in Summer

  • ZHOU Limin ,
  • CHEN Haishan ,
  • PENG Lixia ,
  • XU Bei
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  • Datong Meteorological Bureau, Datong 037010, China;2. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory of Meteorological Disaster, Nanjing University of Information Science & Technology, Nanjing 210044, China;3. School of Atmospheric Sciences, Nanjing University of Information Science & Technology, Nanjing 210044, China

Received date: 2014-05-05

  Online published: 2016-02-28

摘要

利用1978-2006年SSMR和SSM/I卫星遥感雪深反演资料和同期NCEP/NCAR再分析月平均值资料,采用经验正交函数分解EOF、合成分析和相关分析等方法,分析了青藏高原冬、春季积雪深度(下称雪深)的时空分布演变特征,并在此基础上研究了青藏高原冬、春季雪深的年代际变化与夏季南亚高压的可能联系。结果表明,青藏高原冬、春季雪深EOF分析第一模态呈现出全区冬春一致性的年代际变化特征,即:1987(1988)年之前青藏高原冬(春)季大部分地区少雪,1987(1988)年之后则多雪。青藏高原冬、春季雪深EOF分析第一模态时间系数与南亚高压东伸指数、强度指数相关显著。进一步分析表明,高原冬、春季积雪少(多)主要增强(减弱)了夏季高原南部对大气的加热作用,从而引起高原上空对流层的上升运动明显加强(减弱),有(不)利于热量向高空输送,致使高原对上空对流层加热作用增强(减弱),从而造成了南亚高压较强(弱),东脊点偏东(西)。

本文引用格式

周利敏 , 陈海山 , 彭丽霞 , 许蓓 . 青藏高原冬春雪深年代际变化与南亚高压可能联系[J]. 高原气象, 2016 , 35(1) : 13 -23 . DOI: 10.7522/j.issn.1000-0534.2014.00152

Abstract

By using monthly SSMR and SSM/I satellite retrieved snow depth as well as NCEP/NCAR reanalysis data during 1978-2006,the spatial and temporal variations of snow depth anomalies in winter and spring over the Qinghai-Xizang Plateau were investigated with statistical methods such as EOF,correlation and composite analysis.And the connection between interdecadal variations of snow depth in winter and spring over the Qinghai-Xizang Plateau and summer South Asia High are further explored.Results show that the leading EOF modes of winter and spring snow depths exhibt consistent spatial and temporal variations and significant inter-decadal variations.Less winter(spring) snow appears in most areas before 1987(1988),while more snow exists after that.There are evident correlation between the time coefficients of the first EOF mode of snow depth and the characteristic index of the South Asia High.Further analysis suggests that light(thick) snow in winter and spring tends to enhance(reduce) the surface heating,especially in the south part of the Qinghai-Xizang Plateau and intensify(weaken) the vertical motion over the Qinghai-Xizang Plateau,resulting stronger(weaker) and eastward(westward) summer South Asia High.

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