Response of North Pacific Eastern Subtropical Mode Water to Greenhouse Gas Versus Aerosol Forcing  

作　　者：Xiang LI Yiyong LUO 

机构地区：[1]Physical Oceanography Laboratory, Ocean University of China

出　　处：《Advances in Atmospheric Sciences》2016年第4期522-532,共11页大气科学进展（英文版）

基　　金：supported by the National Basic Research Program of China (Grant No. 2012CB955600);National Natural Science Foundation of China (Grant Nos. 41376009 and 41176006);Strategic Priority Research Program of the Chinese Academy of Sciences (Grant Nos. XDA11010302 and XDA11010201);the Joint Program of Shandong Province and National Natural Science Foundation of China (Grant No.U1406401)

摘　　要：Mode water is a distinct water mass characterized by a near vertical homogeneous layer or low potential vorticity, and is considered essential for understanding ocean climate variability. Based on the output of GFDL CM3, this study investigates the response of eastern subtropical mode water （ESTMW） in the North Pacific to two different single forcings： greenhouse gases （GHGs） and aerosol. Under GHG forcing, ESTMW is produced on lighter isopycnal surfaces and is decreased in volume. Under aerosol forcing, in sharp contrast, it is produced on denser isopycnal surfaces and is increased in volume. The main reason for the opposite response is because surface ocean-to-atmosphere latent heat flux change over the ESTMW formation region shoals the mixed layer and thus weakens the lateral induction under GHG forcing, but deepens the mixed layer and thus strengthens the lateral induction under aerosol forcing. In addition, local wind changes are also favorable to the opposite response of ESTMW production to GHG versus aerosol.Mode water is a distinct water mass characterized by a near vertical homogeneous layer or low potential vorticity, and is considered essential for understanding ocean climate variability. Based on the output of GFDL CM3, this study investigates the response of eastern subtropical mode water （ESTMW） in the North Pacific to two different single forcings： greenhouse gases （GHGs） and aerosol. Under GHG forcing, ESTMW is produced on lighter isopycnal surfaces and is decreased in volume. Under aerosol forcing, in sharp contrast, it is produced on denser isopycnal surfaces and is increased in volume. The main reason for the opposite response is because surface ocean-to-atmosphere latent heat flux change over the ESTMW formation region shoals the mixed layer and thus weakens the lateral induction under GHG forcing, but deepens the mixed layer and thus strengthens the lateral induction under aerosol forcing. In addition, local wind changes are also favorable to the opposite response of ESTMW production to GHG versus aerosol.

关 键 词：greenhouse gases AEROSOL mode water lateral induction North Pacific 

分 类 号：P732.6[天文地球—海洋科学] X16[环境科学与工程—环境科学]