Weak response of the Atlantic thermohaline circulation to an increase of atmospheric car-bon dioxide in IAP/LASG Climate System Model  

作　　者：ZHOUTianjun YURucong LIUXiying GUOYufu YUYongqiang ZHANGXuehong 

机构地区：[1]LASG,InstituteofAtmosphericPhysics,ChineseAcademyofSciences,Beijing100029,China

出　　处：《Chinese Science Bulletin》2005年第6期592-598,共7页

基　　金：supported by the Knowledge Innovation Program of Chinese Academy of Sciences(Grant No.ZKCX2-SW-210);the National Natural Science Foundation of China(Grant Nos.40005004,40375029 and 40233031);the Major State Basic Research Development Program of China(973 Program)(Grant No.G200007850-2).

摘　　要：Response of the Atlantic thermohaline circula- tion (THC) to global warming is examined by using the cli- mate system model developed at IAP/LASG. The evidence indicates that the gradually warming climate associated with the increased atmospheric carbon dioxide leads to a warmer and fresher sea surface water at the high latitudes of the North Atlantic Ocean, which prevents the down-welling of the surface water. The succedent reduction of the pole-to- equator meridional potential density gradient finally results in the decrease of the THC in intensity. When the atmos- pheric carbon dioxide is doubled, the maximum value of the Atlantic THC decreases approximately by 8%. The associ- ated poleward oceanic heat transport also becomes weaker. This kind of THC weakening centralizes mainly in the northern part of the North Atlantic basin, indicating briefly a local scale adjustment rather than a loop oscillation with the whole Atlantic “conveyor belt” decelerating.Response of the Atlantic thermohaline circulation (THC) to global warming is examined by using the climate system model developed at IAP/LASG. The evidence indicates that the gradually warming climate associated with the increased atmospheric carbon dioxide leads to a warmer and fresher sea surface water at the high latitudes of the North Atlantic Ocean, which prevents the down-welling of the surface water. The succedent reduction of the pole-to-equator meridional potential density gradient finally results in the decrease of the THC in intensity. When the atmospheric carbon dioxide is doubled, the maximum value of the Atlantic THC decreases approximately by 8%. The associated poleward oceanic heat transport also becomes weaker. This kind of THC weakening centralizes mainly in the northern part of the North Atlantic basin, indicating briefly a local scale adjustment rather than a loop oscillation with the whole Atlantic 'conveyor belt' decelerating.

关 键 词：大西洋 热盐 大气 二氧化碳 IAP/LASG 气候 

分 类 号：P732[天文地球—海洋科学]