热带气象学报2018，Vol.34Issue(3)：339-346,8.DOI:10.16032/j.issn.1004-4965.2018.03.007
盛夏南海低空越赤道气流变化与东亚夏季风的联系
THE VARIATION OF THE LOW-LEVEL CROSS-EQUATORIAL FLOW OVER THE SOUTH CHINA SEA AND ITS ASSOCIATION WITH THE EAST ASIAN SUMMER MONSOON IN MIDSUMMER
摘要
Abstract
Based on the monthly European Center for Medium-Range Weather Forecasts (ECMWF) Re-Analysis (ERA) Interim data and the observed precipitation data of 160 stations in China for the period 1979—2014, the variation of the Cross-Equatorial Flow (CEF) over the South China Sea (SCS) and its connection with the East Asian summer monsoon in midsummer are investigated by regression analysis method. It is shown that the index of the intensity of the SCS low-level CEF (SCEF) has a significantly positive (negative) correlation with the SCS summer monsoon index (East Asian subtropical summer monsoon index). When the SCEF in midsummer is stronger (weaker), the intensity of Asia low pressure and Inter-tropical Convergence Zone (ITCZ) in the west Pacific increases(decreases), the west Pacific subtropical high becomes weaker (stronger) and moves eastward (westward), cyclonic (anti-cyclonic) circulation anomalies emerge in the northern area of SCS and Northwest Pacific, resulting in the strengthening (weakening) of the SCS summer monsoon and the weakening (strengthening) of the East Asian subtropical summer monsoon. Moreover, when the SCEF is stronger, there is northeast (southerly) wind anomaly in South China (North China) induced by the weakening of the East Asian subtropical summer monsoon. As a result, water vapor anomaly is converged (diverged) in South China (Central China), leading to more (less) precipitation in South China (Central China);and vice versa.关键词
气候学/东亚夏季风/回归分析/南海越赤道气流/盛夏/中国降水Key words
climatology/East Asian summer monsoon/Cross-Equatorial Flow over the South China Sea/midsummer/precipitation in China分类
天文与地球科学引用本文复制引用
李忠贤,范倩莹,曾刚,邓伟涛..盛夏南海低空越赤道气流变化与东亚夏季风的联系[J].热带气象学报,2018,34(3):339-346,8.基金项目
国家自然科学基金资助项目(41575102、41575085) （41575102、41575085）
国家重点基础研究发展计划(973 计划)项目(2013CB430202)共同资助 （973 计划）
