热带气象学报2011，Vol.27Issue(5)：609-618,10.DOI:10.3969/j.issn.1004-4965.2011.05.001
不同海域SSTA对东半球越赤道气流年代际变化影响的数值模拟研究
NUMERICAL SIMULATION OF SSTA IMPACTS UPON THE INTERDECADAL VARIATION OF THE CROSS-EQUATOR FLOWS IN EASTERN HEMISPHERE
摘要
Abstract
Impacts of regional sea surface temperature anomaly(SSTA) on the interdecadal variation of the cross-equator flows(CEF) in eastern hemisphere are studied using numerical simulations with a global atmospheric circulation model(NCAR CAM3) driven with 1950-2000 monthly SSTs in different sea areas (global, extratropical, tropical, tropical Indian Ocean-Pacific, and tropical Pacific) and ERA-40 reanalysis data. Results show that all simulations except one driven with extratropical SSTs can simulate the interdecadal scale strengthening of CEFs around Somali, 120 °E, and 150 °E occurred in mid-late 1970s. Among those simulated CEFs, the interdecadal variability of simulated CEF in Somali and its interdecadeal relationship with East Asian summer monsoon are in better agreement with observations, suggesting that changes in SSTs of tropical oceans, especially the tropical Pacific plays a crucial role in the interdecadal variability of CEF in Somali. The interdacadal changes of CEF in Somali is highly associated with the interdecadal variation of tropical Pacific SST. As the interdecadal warmer(colder) SST happens in the tropical Pacific, a "sandwich" type SSTA pattern " + 、-、+"(" - 、+、-") will occur in the eastern tropical Pacific from north to south with a pair of anomaly anticyclone(cyclone) at the lower troposphere; the anticyclone(cyclone) pair links to another pair cyclone(anticyclone) in tropical Indian Ocean through atmosphere bridge, and thus strengthen(weaken) CEF in Somali.关键词
气候学/东半球越赤道气流/数值模拟/年代际变化/海表温度异常Key words
climatology/ cross-equator Flow in Eastern Hemisphere/ numerical simulation/ interdecadal variation/ SSTA分类
海洋科学引用本文复制引用
曾刚,孙照渤,邓伟涛,林朝晖,李春晖..不同海域SSTA对东半球越赤道气流年代际变化影响的数值模拟研究[J].热带气象学报,2011,27(5):609-618,10.基金项目
国家自然科学基金项目(40775059 （）
41071029) （）
广州热带海洋气象研究所热带基金项目(200806) （200806）
中国科学院知识创新工程领域前沿项目(IAP09312)共同资助 （IAP09312）
