气象与环境学报Issue(3)：81-88,8.DOI:10.3969/j.issn.1673-503X.2015.03.013
南大洋淡水强迫对南半球环状模的影响分析
Impacts of freshwater forcing over the Southern Ocean on Southern Annular Mode
摘要
Abstract
Southern Annular Mode (SAM)is a dominant mode of the southern extra-tropical circulation,which can exert a strong influence on the ocean-atmosphere-sea ice coupled system in the Southern Ocean (SO).Fresh-water forcing induced by ice-melting is important for the SO.In historical climate records,SO freshwater flux a-nomaly used to trigger several global climate abnormal events.Based on the ocean-atmosphere fully coupled model FOAM,the response of SAM to idealized freshwater forcing was investigated with 1 .0 Sv freshwater flux anomaly imposed uniformly to the south of 60°S in the SO in order to study the change of SAM induced by the local forc-ing.The results indicate that local westerly wind is significantly strengthened,which can be seen from lower layers to upper layers.Change of westerly wind intensity increases baroclinicity in the troposphere and decreases barocli-nicity in the stratosphere.Moreover,the interannual variability of SAM remarkably weakens,while the interdecadal variability strengthens.Change of spectrum energy is consistent at all vertical layers.Variation of external forcing such as sea surface temperature and sea ice largely contributes to the enhancement of decadal variability of SAM.关键词
南半球环状模/南大洋/淡水强迫/海-气耦合模式Key words
Southern Annular Mode (SAM)/Southern Ocean (SO)/Freshwater forcing/Ocean-atmosphere cou-pled model分类
天文与地球科学引用本文复制引用
马浩,李正泉,冯涛,刘成彦..南大洋淡水强迫对南半球环状模的影响分析[J].气象与环境学报,2015,(3):81-88,8.基金项目
国家自然科学基金项目“中全新世北太平洋年代际振荡及其机制研究”（41106009）、国家自然科学基金项目“登陆台风风场三维高分辨率结构模拟与分析研究”（90815028）和浙江省气象科技计划项目“热带印度洋海温变异对浙江省短期气候预测的指示意义及应用研究”（2012QN04）共同资助。 （）
