Changes in Atlantic Thermohaline Circulation under Different Atmospheric CO_2 Scenarios in a Climate Model

作     者：牟林 吴德星 陈学恩 

作者机构：Institute of Physical Oceanography Ocean University of China Qingdao 266003 China Max-Planck Institute for Meteorology Hamburg 20146 Germany 

出 版 物：《Journal of China University of Geosciences》 (中国地质大学学报（英文版）)

年 卷 期：2006年第17卷第4期

页      面：326-331页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：This paper is supported by the National Natural Science Foundation ofChina(No.90411010) the German Academic Exchange Service(DAAD)and the German Cli mate Center 

主　　题：thermohaline circulation (THC) greenhouse gases deepwater. 

摘      要：The changes in the thermohaline circulation （THC） because of the increased CO2 in the atmosphere play an important role in future climate regimes. In this article, a new climate model developed at the Max-Planck Institute for Meteorology is used to study the variation in THC strength, the changes of North Atlantic deep-water （NADW） formation, and the regional responses of the THC in the North Atlantic to increasing atmospheric CO2. From 2000 to 2100, under increased CO2 scenarios （B1, AIB, and A2）, the strength of THC decreases by 4 Sv （106 m^3/s）, 5.1 Sv, and 5.2 Sv, respectively, equivalent to a reduction of 20%, 25%, and 25.1% of the present THC strength. The analyses show that the oceanic deep convective activity significantly strengthens in the Greenland-leeland-Norway （GIN） Seas owing to saltier （denser） upper oceans, whereas weakens in the Labrador Sea and in the south of the Denmark Strait region （SDSR） because of surface warming and freshening due to global warming. The saltiness of the GIN Seas is mainly caused by the increase of the saline North Atlantic inflow through the Faro-Bank （FB） Channel. Under the scenario A1B, the deep-water formation rate in the North Atlantic decreases from 16.2 Sv to 12.9 Sv with increasing CO2.