主办单位:中国气象局沈阳大气环境研究所
国际刊号:ISSN 1673-503X
国内刊号:CN 21-1531/P

气象与环境学报 ›› 2018, Vol. 34 ›› Issue (6): 84-90.doi: 10.3969/j.issn.1673-503X.2018.06.009

• 论文 • 上一篇    下一篇

大连盛夏旱涝典型年环流对比分析

王秀萍1, 陈希壮2, 程航1, 金巍3   

  1. 1. 大连市气象台, 辽宁 大连 116001;
    2. 大连市气象局, 辽宁 大连 116001;
    3. 鞍山市气象局, 辽宁 鞍山 114004
  • 收稿日期:2017-08-03 修回日期:2017-11-28 出版日期:2018-12-31 发布日期:2018-12-31
  • 作者简介:王秀萍,女,1970年生,高级工程师,主要从事天气与气候研究,E-mail:13998499463@163.com。
  • 基金资助:
    空间天气学国家重点实验室开放课题“地磁活动因子对气候要素的影响研究”(Y72612A28S)、2016年辽宁省气象部门认定项目成果“省市级短时临近预报业务系统(SWAN)的本地化应用”和渤海区域科技协同创新基金项目(QYXM21711)共同资助。

Comparison analysis of circulation anomalies in midsummer between drought and flood years in Dalian

WANG Xiu-ping1, CHEN Xi-zhuang2, CHENG Hang1, JIN Wei3   

  1. 1. Dalian Meteorological Observatory, Dalian 116001, China;
    2. Dalian Meteorological Service, Dalian 116001, China;
    3. Anshan Meteorological Service, Anshan 114004, China
  • Received:2017-08-03 Revised:2017-11-28 Online:2018-12-31 Published:2018-12-31

摘要: 利用1964-2016 年大连地区6个气象观测站逐月降水资料、NCEP/NCAR 再分析月平均资料和国家气候中心提供的西太平洋副热带高压环流特征量资料,采用相关分析和合成分析的方法,分析了大连地区盛夏(7-8月)旱涝的大气环流异常特征,并从大气环流异常的角度揭示了大连地区盛夏旱涝的成因。结果表明:大连地区盛夏涝(旱)年,200 hPa东北地区西风急流强(弱)、长江流域西风急流弱(强),500 hPa西太平洋副热带高压脊线偏北(南),东亚大槽偏西(东),850 hPa南风异常偏强(弱),大连地区所在经度上垂直速度的经圈环流在大连上空出现异常上升(下沉)运动,从而导致大连地区盛夏降水异常偏多(少)。

关键词: 旱涝, 环流异常, 西风急流

Abstract: Based on the observed monthly precipitation data at 6 stations in Dalian from 1964 to 2016,the NCEP/NCAR monthly mean reanalysis data during 1948-2016 and the circulation feature data of the western Pacific subtropical high (WPSH) given by the National Climate Center,the characteristics of the atmospheric circulation anomalies of the extremely drought/flood occurrences from July to August were studied using the methods of composite analysis and correlation analysis.Meanwhile,the causes of midsummer drought and waterlogging were revealed by considering atmospheric circulation anomalies.The results show that in midsummer waterlogging (drought) years in Dalian area,the northeast China westerly jet at 200 hPa is stronger (weaker) and the Yangtze River Valley westerly jet is weaker (stronger).At the same time,the location of the Western Pacific Subtropical high ridge line is more-northward (more-southward) and that of the East Asia trough is more-westward (more-eastward) at 500 hPa as well as the south wind anomalies at 850hPa is stronger (weaker).In addition,the anomalous ascending (descending) motions occur in the meridional circulation of vertical speed along the longitude of Dalian,which results in midsummer precipitation anomalously increasing (decreasing) over Dalian area.

Key words: Drought and flood, Atmospheric circulation anomaly, Westerly jet

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