热带气象学报2018，Vol.34Issue(1)：1-11,11.DOI:10.16032/j.issn.1004-4965.2018.01.001
影响南海夏季风爆发年际变化的关键海区及机制初探
THE KEY OCEANIC REGIONS AFFECTING INTERANNUAL VARIATION OF ONSET DATE OF SCSSM AND THEIR PRELIMINARY MECHANISMS
摘要
Abstract
The origin of SSTA of key oceanic regions affecting the interannual variation of onset date of South China Sea summer monsoon and possible mechanisms are studied using Lanczos filter,correlation analysis,regression analysis,composite analysis and cross-validation with NCEP/NCAR reanalysis dataset and ERSST dataset from 1958 to 2011.The results show that the previous winter tropical southwest Indian Ocean and tropical northwest Pacific are key oceanic regions affecting the interannual variation of South China Sea summer monsoon onset date.The anomalous warming of winter tropical southwest Indian Ocean (tropical northwest Pacific) is triggered by E1 Ni(n)o early onset (planetary east-west circulation induced by heating of strong Indian summer monsoon),and maintained by local air-sea interaction positive feedback process in tropical Indian Ocean (tropical northwest Pacific) until the spring.The winter anticyclonic (cyclonic) circulation over tropical northwest Pacific and local air-sea interaction positive feedback process in tropical Indian Ocean (tropical northwest Pacific) make SSTA in tropical Indian Ocean (tropical northwest Pacific) maintain until the spring.The spring low-level easterly jet (anomalous westerly) responding to warm SSTA in north Indian Ocean (tropical northwest Pacific) gradually enhances and moves northward to 10 °N.The anomalous anticyclonic (cyclonic) circulation over South China Sea and tropical northwest Pacific induces late (early) onset of South China Sea summer monsoon.关键词
南海夏季风爆发/年际变化/关键海区/机制/热带西南印度洋/热带西北太平洋Key words
onset of South China Sea summer monsoon/interannual variation/key oceanic region/mechanism/tropical southwest Indian Ocean/tropical northwest Pacific分类
天文与地球科学引用本文复制引用
谷德军,纪忠萍,林爱兰..影响南海夏季风爆发年际变化的关键海区及机制初探[J].热带气象学报,2018,34(1):1-11,11.基金项目
国家自然科学基金项目(41375095) （41375095）
全球变化研究国家重大科学研究计划(2014CB953901) （2014CB953901）
中国科学院战略性先导科技专项(XDA11010403)共同资助 （XDA11010403）
