Mechanism of the Greenland-Scotland Ridge overflow variation under different atmospheric CO_2 scenarios  

作　　者：MU Lin SONG Jun ZHONG LinHao WANG LanNing LI Huan LI Yan 

机构地区：[1]National Marine Data and Information Service, Tianjin 300171, China [2]Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China [3]Beifing Normal University, Beifing 100875, China [4]Max-Planck Institute for Meteorology, Hamburg 20146, Germany

出　　处：《Chinese Science Bulletin》2011年第24期2635-2643,共9页

基　　金：supported by the National Natural Science Foundation of China (40940025 and 41006002);the Public science and technology research funds projects of ocean (200905001, 201005019 and 2012418018);the Tianjin Municipal Science and Technology Commission project (09JCYBJC07400), and DAAD fund

摘　　要：Baroclinic transport and the barotropic effect are two different viewpoints for understanding the mechanism of the Greenland-Scotland Ridge overflow. The mechanism of this overflow, being an important deep branch of thermohaline circulation, deserves research discussion, especially against the background of global warming. Using the newly developed ECHAM5/MPI-OM, of the Max Planck Institute for Meteorology, which is an advanced atmospheresea iceocean coupled climate model, the mechanism of the Greenland-Scotland Ridge overflow variation under different atmospheric CO2 scenarios is studied. First, a control experiment is forced by a fixed CO2 concentration of 280 ppmv, which is the pre-industrial level before 1860. Three sensitive experiments are carried out under different scenarios of increased atmospheric CO2 concentrations, which are listed in the Intergovernmental Panel on Climate Change (IPCC) assessment report (B1, A1B and A2). In the control run, more water with higher salinity intruding into the Greenland-Icelandic-Norwegian Seas results in greater barotropic transport and greater overflow because of the baroclinic effect. Therefore, the barotropic effect and baroclinic effect on the overflow are unified. Under the atmospheric CO2 scenarios, the strength of overflow across the Faro-Bank Channel is controlled by the baroclinic effect and the increase in Denmark Strait overflow is attributed to the barotropic effect.Baroclinic transport and the barotropic effect are two different viewpoints for understanding the mechanism of the Greenland- Scotland Ridge overflow. The mechanism of this overflow, being an important deep branch of thermohaline circulation, deserves research discussion, especially against the background of global warming. Using the newly developed ECHAM5/MPI-OM, of the Max Planck Institute for Meteorology, which is an advanced atmosphere-sea ice-ocean coupled climate model, the mechanism of the Greenland-Scotland Ridge overflow variation under different atmospheric CO2 scenarios is studied. First, a control experiment is forced by a fixed CO2 concentration of 280 ppmv, which is the pre-industrial level before 1860. Three sensitive experiments are carded out under different scenarios of increased atmospheric CO2 concentrations, which are listed in the Intergovernmental Panel on Climate Change （IPCC） assessment report （B1, A1B and A2）. In the control run, more water with higher salinity intruding into the Greenland-Icelandic-Norwegian Seas results in greater barotropic transport and greater overflow because of the baroclinic effect. Therefore, the barotropic effect and baroclinic effect on the overflow are unified. Under the atmospheric CO2 scenarios, the strength of overflow across the Faro-Bank Channel is controlled by the baroclinic effect and the increase in Denmark Strait overflow is attributed to the barotropic effect.

关 键 词：二氧化碳浓度 格陵兰 苏格兰 溢出 大气 机制 政府间气候变化专门委员会 斜压效应 

分 类 号：P734.22[天文地球—海洋化学]