索马里急流与印度夏季降水关系的年代际变化
投稿时间: 2018-01-06  最后修改时间: 2018-03-26  点此下载全文
引用本文:
摘要点击次数: 200
全文下载次数: 
作者单位E-mail
郭品文 南京信息工程大学 guo@nuist.edu.cn 
吴冰菁 南京信息工程大学  
中文摘要:本文利用1958-2014年印度热带气象研究所的全印度降水量和欧洲中期预报中心(ECMWF)、日本气象厅(JRA-55)及美国环境预报中心与国家大气预报中心(NCEP/NCAR)的再分析资料,研究了索马里急流(SMJ)与印度夏季降水的相关关系。结果表明:在1983年之前,SMJ与印度夏季降水有显著的正相关关系,这跟以往的认识一致,但在1983年之后两者的正相关关系显著减弱。研究进一步发现,在1983年之前,南印度洋及索马里沿岸有越赤道气流正异常,阿拉伯海、印度西北地区存在西南风正异常,异常强的SMJ对应着异常强的阿拉伯海西南季风,从而增加印度夏季的水汽输送,进而加强季风降水,且SMJ与南亚高压联系密切;但在1983年后,阿拉伯海北部及印度西北地区的西南风关系正异常减弱了,特别是在印度西海岸的西南风正异常显著减弱了,而且其与南亚高压的关系也显著减弱了,从而导致SMJ与印度夏季降水的正相关关系显著减弱。另外,在印度夏季降水与ENSO、SMJ相关关系减弱的同时,初步显示它与东亚/太平洋遥相关型(EAP)的相关关系却有所加强。
中文关键词:索马里急流  印度夏季降水  相关关系  减弱
 
Interdecadal changes of the relations between the Somali jet and the India summer rainfall
Abstract:The whole India summer rainfall data set from The Indian Institute of Tropical Meteorology, monthly Reanalysis data set from European Center for Medium-Range Weather Forecasts(ECMWF), Japan Meteorological Agency/Japan(JRA-55) and National Center for Environment Prediction/National Center for Atmospheric Research(NCEP/NCAR) during 1958-2014 are used to study the relations between Somali jet and Indian summer rainfall. It is indicated that before 1983, SMJ have significant positive correlation with the Indian summer rainfall, which accorded with the understanding of the past, but after 1983, the nice positive correlation is significantly weakening. Further study indicated that before 1983, the South India ocean and the Somali coast have a positive anomaly of the Somali equatorial airflow, and there is a positive anomalous southwest wind in the Arabia sea and the northwest of India, then increasing the summer water vapor transport to India, further strengthening Indian monsoon precipitation, and SMJ is closely links to the South Asia high; However, after 1983, The south-west wind positive anomaly in the north of the Arabia sea and the northwest of India are weakened, particularly in the west coast of India, and the correlation between SMJ and the South Asia high is also weakened, resulting in the weakening relationship between SMJ and Indian summer rainfall. In addition, while the relations between Indian summer rainfall and ENSO, SMJ are weakening,there preliminary display the correlation of Indian summer rainfall with East Asia/Pacific Teleconnection (EAP) is significant strengthened.
keywords:Somali jet  India summer rainfall  relations  weakening
查看全文  查看/发表评论  下载PDF阅读器