The impacts of different surface boundary conditions for sea surface salinity on simulation in an OGCM  

作　　者：JIN Jiang-Bo ZENG Qing-Cun LIU Hai-Long WU Lin 

机构地区：[1]International Center for Climate and Environment Sciences(ICCES),Institute of Atmospheric Physics(IAP),Chinese Academy of Sciences(CAS) [2]College of Earth Science,University of Chinese Academy of Sciences [3]State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG),Institute of Atmospheric Physics,Chinese Academy of Sciences [4]State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry(LAPC),Institute of Atmospheric Physics,Chinese Academy of Sciences

出　　处：《Atmospheric and Oceanic Science Letters》2016年第6期465-470,共6页大气和海洋科学快报（英文版）

基　　金：partially supported by the National Basic Research Program of China[grant number 2013CB956204];the Strategic Priority Research Program of the Chinese Academy of Sciences[grant number XDA11010403],[grant number XDA11010304];the National Natural Science Foundation of China[grant number 41305028]

摘　　要：An OGCM, LICOM2.0, was used to investigate the effects of different surface boundary conditions for sea surface salinity （SSS） on simulations of global mean salinity, SSS, and the Atlantic Meridional Overturning Circulation （AMOC）. Four numerical experiments （CTRL, Expl, Exp2 and Exp3） were designed with the same forcing data-set, CORE.v2, and different surface boundary conditions for SSS~ A new surface salinity boundary condition that consists of both virtual and real salt fluxes was adopted in the fourth experiment （Exp3）. Compared with the other experiments, the new salinity boundary condition prohibited a monotonous increasing or decreasing global mean salinity trend. As a result, global salinity was approximately conserved in EXP3. In the default salinity boundary condition setting in LICOM2.0, a weak restoring salinity term plays an essential role in reducing the simulated SSS bias, tending to increase the global mean salinity. However, a strong restoring salinity term under the sea ice can reduce the global mean salinity. The authors also found that adopting simulated SSS in the virtual salt flux instead of constant reference salinity improved the simulation of AMOC, whose strength became closer to that observed.盐度是海洋的一个基本状态变量,在海洋环流中起着重要的作用。少量的盐通量扰动都会改变海洋的经向翻转环流和海表温盐场。因此,本文使用了海洋环流模式LICOM2.0研究了不同盐度边界条件对全球总盐量、海表盐度和大西洋经圈翻转环流模拟的影响。结果表明:洋面上的弱恢复项对合理地模拟海表盐度起着重要的作用,且对全球总盐量起着递增的作用;在虚盐通量中使用模拟的海表盐度而非定常的参考盐度能够更合理地模拟大西洋经圈翻转环流;除此之外,含有实盐通量的盐度边界条件能够更好地维持全球总盐量的守恒。

关 键 词：Surface salinity boundarycondition real salt flux Atlantic Meridional Overturning Circulation global mean salinity 

分 类 号：P731.12[天文地球—海洋科学] P731.27