Journal of Arid Meteorology

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Effects of South Asia High and Western Pacific Subtropical High on the Summer Precipitation Anomalies over Southwest China  

ZHANG Yu1LI Yaohui1WEI Linbo2LIU Kang3   

  1. 1. Key Laboratory of Arid Climate Change and Disaster Reducing of Gansu Province/Key Open Laboratory of Arid Climate Change and Disaster Reduction of CMA,Institute of Arid Meteorology,China Meteorological Administration,Lanzhou 730020,China;
    2. Key Laboratory for Semi - Arid Climate Change of the Ministry of Education,Lanzhou University,Lanzhou 730000,China;
    3. Gansu Provincial Meteorological Service Center,Lanzhou 730020,China
  • Received:2013-01-17 Revised:2013-06-13 Online:2013-09-30 Published:2013-09-30

南亚高压与西太平洋副热带高压对我国西南地区夏季降水异常的影响

张 宇1李耀辉1魏林波2刘 抗3   

  1. 1. 中国气象局兰州干旱气象研究所,甘肃省干旱气候变化与减灾重点实验室,中国气象局干旱气候变化与减灾重点开放实验室,甘肃 兰州 730020;
    2. 半干旱气候变化教育部重点实验室,兰州大学,甘肃 兰州730000;
    3. 甘肃省气象局气象服务中心,甘肃 兰州 730020
  • 作者简介:张宇(1983 - ),女,内蒙古乌兰察布人,博士,助研,主要从事大气环流与气候变化研究. E - mail:zhangyu198303@163. com
  • 基金资助:

    科研启动金(KYS2012BSKY01)与半干旱气候变化教育部重点实验室(兰州大学)开放基金资助共同资助

Abstract:

The effects of South Asia high and Western Pacific subtropical high on the summer precipitation anomalies over southwest
China were analyzed in this study using the NCEP/NCAR reanalysis data and observation data from 1961 to 2010. Results indicated
that the South Asia high and West Pacific subtropical high were main impacting factors for summer precipitation anomalies in southwest China from 1961 to 2010. The meridional distance between the east ridge of South Asia high and the western ridge of Western Pacific subtropical high presented obvious abnormal feature in three periods which were 31 pentad,36 -37 pentad and 45 -46 pentad,espe-cially in drough and flood years,there was significant difference between them in three periods. Compared the meridional distance be-tween the east ridge of South Asia high and western ridge of Western Pacific subtropical high in 31 pentad in this year with that in last year,the larger of the difference was,the more rainfall would be in summer in southwest China,especially in the middle and east re-gion of southwest China.

 

Key words: South Asia high, Western Pacific subtropical high, summer precipitation anomalies  

摘要:

利用 1961 ~2010 年全国台站观测资料中逐日平均降水资料,及同期 NCEP/NCAR 再分析资料,通过统计方法,研究分析了南亚高压东脊点和西太平洋副热带高压西脊点对我国西南地区夏季区域降水的影响。分析得到:对于 1961 ~2010 年我国西南地区夏季降水异常,南亚高压与西太平洋副热带高压其东西脊点之间的经距,在 31 候、36 ~37 候以及 45 ~46 候,体现出明显异常特征。特别是涝年和旱年对比中,在这 3 个时段上存在明显差异。并且发现,31 候时南亚高压东脊点与西太平洋副热带高压西脊点之间经距,与前一年的差距越大,我国西南地区该年夏季降水偏多,特别是中部与东部,效果更为显著。

关键词: 南亚高压, 西太平阳副热带高压, 夏季降水异常

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