地理科学 ›› 2015, Vol. 35 ›› Issue (1): 99-106.doi: 10.13249/j.cnki.sgs.2015.01.99

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青海地区冬季气温年际变化及其成因分析

王冀1(), 申红艳2, 张英娟1, 王振宇2   

  1. 1.北京市气候中心, 北京 100089
    2.青海省气候中心, 北京 810001
  • 收稿日期:2013-08-25 修回日期:2013-11-20 出版日期:2015-01-15 发布日期:2015-01-15
  • 作者简介:

    作者简介:王冀(1973-),男,河北武强人,博士,高级工程师,主要从事全球气候变化研究。E-mail: wangji_zl@163.com

  • 基金资助:
    国家科技支撑计划课题(2009BAC51B05)、中国气象局气候变化专项(CCSF2011-15)资助

Interannual Variability and Its Causes of Winter Temperature in Qinghai Region

Ji WANG1(), Hong-yan SHEN2, Ying-juan ZHANG1, Zhen-yu WANG2   

  1. 1.Beijing Regional Climate Center, Beijing 100089, China
    2.Qinghai Climate Center, Beijing 810001, China
  • Received:2013-08-25 Revised:2013-11-20 Online:2015-01-15 Published:2015-01-15

摘要:

利用青海地区38个台站(1961-2010年) 和Ncep再分析资料,分析了青海地区冬季气温年际变化特征及其形成机制。结果表明:青海地区冬季气温主要呈现出南北一致型和东西反相两种分布型。低温年时,中高纬呈“+ - +”波列,垂直方向呈准正压结构。WP与第一模态时间系数的相关最显著,其次是EU和PNA。冬季北大西洋南部地区海温通过激发欧亚波列影响欧亚大气环流;西风漂流区和黑潮区海温均对东亚冬季风有负反馈作用。在中部型El-Niño事件期间,青海地区易受偏西、偏北强冷气流影响,青海地区气温偏低。

关键词: 青海地区, 冬季气温, 遥相关, 年际变化

Abstract:

Interannual variation of temperature in winter over Qinghai and its mechanisms are analyzed using data(1961-2010) from 38 stations over the region as well as National Centers for Environmental Prediction(NCEP) reanalysis data. It unveiled that there exist two major temperature anomaly patterns in winter over Qinghai: unipole mode from north to south and dipole mode between east and west region. During cold winter a “+-+” wave train lay over mid-high latitude with a quasi-barotropic vertical structure. West Pacific index has the most prominent correlation with time coefficient of prime component 1, secondly, the Euro-Asian index and Pacific-North America index. Sea surface temperature anomalies (SSTA) over the south part of North Atlantic in winter may influence atmosphere circulations over Europe and Asian by setting off a Euro-Asian train. Besides, SSTA in both west wind drift and Kuroshio current region have a negative feedback to the East Asian winter monsoon. Also during an El Nino Modoki episode, moist warm air from low latitude transport northward no farther than East China, which make colder winter in Qinghai on account of strong westerly and boreal airflow.

Key words: Qinghai region, winter temperature, teleconnection, Interannual variation

中图分类号: 

  • P461