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热带印度洋夏季水汽输送特征及对南亚季风区降水的影响
投稿时间:2020-05-12    点此下载全文
引用本文:陈红.热带印度洋夏季水汽输送特征及对南亚季风区降水的影响[J].南京信息工程大学学报,2020,12(4):442~449
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作者单位
陈红 中国科学院大气物理研究所, 北京, 100029 
基金项目:中国科学院战略性先导科技专项(XDA20060501)
中文摘要:利用NCEP/NCAR再分析环流资料、CMAP降水量和NOAA海温资料研究了热带印度洋夏季水汽输送的时空变化特征,并考察其对南亚季风区夏季降水的影响.热带印度洋夏季异常水汽输送第一模态表现为异常水汽从南海向西到达孟加拉湾后分成两支,其中一支继续往西到达印度次大陆和阿拉伯海,对应印度半岛南端和中南半岛的西风水汽输送减弱,导致这些区域降水减少;第二模态表现为异常水汽从赤道东印度洋沿赤道西印度洋、阿拉伯海、印度半岛、中南半岛的反气旋输送,印度和孟加拉湾南部为反气旋异常水汽输送,水汽辐散、降水减少,而印度东北部为气旋性水汽输送,水汽辐合、降水增多.就水汽输送与局地海温的关系而言,水汽输送第一模态与热带印度洋海温整体增暖关系密切,而第二模态与同期印度洋偶极子关系密切.
中文关键词:热带印度洋  水汽输送  南亚  降水
 
Characteristics of summer water vapor transport over tropical Indian Ocean and its effect on precipitation over South Asia
Abstract:The temporal-spatial distribution characteristics of summer water vapor transport over Tropical Indian Ocean (TIO) and its impact on precipitation over South Asia were investigated using monthly datasets of NCEP/NCAR,CMAP precipitation,and NOAA SST datasets.The first leading mode (EOF1) shows that anomalous water vapor transports from South China Sea to the Bay of Bengal,then separates into two branches.Anomalous water vapor in one branch transports westward to Indian Peninsula and the Arabian Sea,and weakens the westerly water vapor transport in the southern tip of the Indian Peninsula and the Indochina Peninsula,resulting in the decrease of precipitation in these regions.The second leading mode (EOF2) shows anomalous anticyclonic water vapor transport from tropical eastern Indian Ocean across western Indian Ocean,Arabian Sea,Indian Peninsula,and Indochina Peninsula.The southern part of the Bay of Bengal and India were controlled by anticyclonic anomalous water vapor transportation with anomalous water vapor divergence,which leads to less precipitation.Meanwhile,the cyclonic water varpor transport over northeast India leads to anomalous water vapor convergence.As a result,more precipitation occurred in northeast India.Furthermore,possible causes for these two modes were discussed.The EOF1 is closely associated with SST warming in the whole tropical Indian Ocean,and the EOF2 is linked with the tropical Indian Ocean Dipole (IOD).
keywords:tropical Indian Ocean  water vapor transport  South Asia  precipitation
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