大气科学学报2012，Vol.35Issue(6)：712-719,8.
不同热盐环流平均强度下北大西洋气候响应的差异
North Atlantic climate response to different average intensity of thermohaline circulation
摘要
Abstract
The CCSM3 (Community Climate System Model version 3 ) developed by US National Cen ter for Atmospheric Research is used to study the characteristics of thermohaline circulation (THC) in the freshwater disturbance experiments with different mean THC intensities, and the influences of THC on the climate in North Atlantic. Results show that: 1 ) In different THC average intensities, the climatol ogy of marine, atmospheric elements over North Atlantic are significantly different. Compared to the high average intensity, in the low average intensity, SST( sea surface temperature), SSS (sea surface sa linity), SSD ( sea surface density ), SAT ( surface air temperature ) over North Atlantic are weakened, and the largest negative anomaly locates in GIN (Greenland seaIceland seaNorwegian sea). With the elevation of SLP( sea level pressure) and the cooling of SST and SAT,there is an abnormal cold high pressure over North Atlantic. Sea ice distribution area expands southward. The precipitation in thewestern tropical Atlantic decreases, leading to ITCZ (intertropical convergence zone) moving south ward. 2) In different THC average intensities, the most notable areas of interannual SST, SSS and SSD anomalies are different. The most significant area locates in GIN in the high average intensity, while in the Labrador waters in the low average intensity. 3 ) In the high average intensity, the maximum of dom inant variability mode of SST over North Atlantic locates in GIN, while it does not exit in GIN in the low average intensity. The dominant variability mode of SLP over North Atlantic is NAOlike mode, but the NAOlike mode is more significant in high average intensity.关键词
热盐环流/北大西洋/气候态/气候变率/主导模态Key words
thermohline circulation/North Atlantic/climatology/climate variability/dominant mode分类
天文与地球科学引用本文复制引用
张福颖,郭品文,程军,倪东鸿,张春莹..不同热盐环流平均强度下北大西洋气候响应的差异[J].大气科学学报,2012,35(6):712-719,8.基金项目
国家重大基础研究计划项目 （）
国家自然科学基金资助项目 （）
南京信息工程大学科研基金资助项目 （）
