doi:  10.3878/j.issn.1006-9895.1706.16290
东北亚地区初夏、盛夏和传统夏季降水特征及环流型的异同性研究

A study on the characteristics of precipitation and circulation pattern in the early summer, middle summer and traditional summer in the Northeast Asian region
摘要点击 2961  全文点击 245  投稿时间:2016-12-21  修订日期:2017-03-07
查看HTML全文  查看全文  查看/发表评论  下载PDF阅读器
基金:  国家自然科学基金
中文关键词:  降水异常 东北亚地区 遥相关型 环流
英文关键词:  Precipitation anomaly Northern Asia region Teleconnection pattern Circulation
           
作者中文名作者英文名单位
胡泊Hu Po兰州大学
申红艳Shen Hongyan兰州大学
王晓娟Wang Xiaojuan常熟理工学院
封国林Feng Guolin中国气象局国家气候中心开放实验室和预测室
引用:胡泊,申红艳,王晓娟,封国林.2018.东北亚地区初夏、盛夏和传统夏季降水特征及环流型的异同性研究[J].大气科学
Citation:Hu Po,Shen Hongyan,Wang Xiaojuan,Feng Guolin.2018.A study on the characteristics of precipitation and circulation pattern in the early summer, middle summer and traditional summer in the Northeast Asian region[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      本文利用1979~2015年GPCP逐月降水资料,采用经验正交函数(EOF)分解和Morlet小波分析方法,对东北亚地区初夏、盛夏和传统夏季降水的时空分布特征以及环流型开展了系统性的研究,揭示了东北亚地区传统夏季降水表现为盛夏降水贡献占主导,其年际和年代际特征以及环流特征同盛夏降水特征相一致,而初夏降水和盛夏降水特征及形成机制则具有显著差异。空间分布上,初夏的降水EOF第一模态表现为“ - ”的三极型分布,而盛夏和传统夏季则表现为南北相反的偶极型特征;时间演变方面,初夏降水表现为5-6a振荡周期,盛夏为2-3a为主的振荡周期,传统夏季则兼具上述两类振荡周期;在年代际调整方面,在1990s末,盛夏降水和传统夏季降水在华北和东北地区发生了显著的年代际转折。此外,分析降水与环流的联系发现:初夏,由于西太平洋上空异常反气旋将西太平洋等地的水汽向北方地区输送,且受欧亚II型(EUII)遥相关的作用,东北亚地区初夏降水异常具有明显纬向特征。盛夏,东北亚地区降水主要受到西太平洋副热带高压西伸北进、孟加拉湾和南海等地水汽加强的影响。欧亚I型(EUI)遥相关和亚洲太平洋型(EAP)遥相关与我国东北以西和沿海地区的降水具有显著相关性。EU型遥相关的作用使东北亚夏季降水的异常中心存在西北-东南向的波列特征,EAP型遥相关的作用则使夏季降水存在经向三极型或偶极型特征。
Abstract:
      Based on the GPCP monthly precipitation data from 1079 to 2015, and used empirical orthogonal function (EOF) analysis and Morlet wavelet methods, systematic researching the temporal and spatial characteristics and circulation patterns of early summer, midsummer and traditional summer precipitation in the Northern Asia. It is shows that the traditional summer precipitation is occupied the dominant by the midsummer precipitation. The interannual and interdecadal features and circulation characteristics consistent with the characteristics of midsummer precipitation, and the early summer and midsummer precipitation characteristics and formation mechanism have significant difference. In spatial distribution, The first leading mode exhibits a “ - ” meridional tripole pattern in the early summer rainfall, and the first leading mode in the midsummer precipitation and traditional summer precipitation shows the reverse features. In time evolution, the time scale cycle was 5-6a in the early summer and 2-3a in the midsummer, and midsummer precipitation have 2-3a and 5-6a period of oscillation. In the late 1990s, only the midsummer precipitation and the traditional summer precipitation have undergo significant interdecadal in North China and Northeast China. In addition, the anomalous anticyclone over the Western Pacific transport the water vapor to the northern part. And by the Eurasian II teleconnection (EUII) effect caused by early summer precipitation anomalies, which has obvious zonal characteristics. In midsummer, the rainfall is mainly affected by the West Pacific subtropical high extending northward and the strengthen water vapor of the bay of Bengal and the South China Sea. Eurasia I (EUI) teleconnection pattern and East Asia-Pacific (EAP) teleconnection pattern have significant correlation with the midsummer precipitation in the west of China and the coastal areas. The role of EUII teleconnection pattern caused the features of the summer precipitation anomaly center form northwest to southeast. And the EAP teleconnection pattern made the summer precipitation by triode or dipole type to the characteristics.
主办单位:中国科学院大气物理研究所 单位地址:北京市9804信箱
联系电话: 010-82995051,010-82995052传真:010-82995052 邮编:100029 Email:dqkx@mail.iap.ac.cn
本系统由北京勤云科技发展有限公司设计
京ICP备09060247号