Based on an eddy permitting ocean general circulation model, the response of water masses to two distinct climate scenarios in the South Pacific is assessed in this paper. Under annually repeating atmospheric forcing ...Based on an eddy permitting ocean general circulation model, the response of water masses to two distinct climate scenarios in the South Pacific is assessed in this paper. Under annually repeating atmospheric forcing that is characterized by different westerlies and associated heat flux, the response of Subantarctic Mode Water（SAMW） and Antarctic Intermediate Water（AAIW） is quantitatively estimated. Both SAMW and AAIW are found to be warmer, saltier and denser under intensified westerlies and increased heat loss. The increase in the subduction volume of SAMW and AAIW is about 19.8 Sv（1 Sv =10-6m-3s-（-1））. The lateral induction term plays a dominant role in the changes in the subduction volume due to the deepening of the mixed layer depth（MLD）. Furthermore, analysis of the buoyancy budget is used to quantitatively diagnose the reason for the changes in the MLD. The deepening of the MLD is found to be primarily caused by the strengthening of heat loss from the ocean to the atmosphere in the formation region of SAMW and AAIW.展开更多
基金supported by the Major State Basic Research Development Program of China(Grant No.2016YFA0601804)the National Natural Science Foundation of China(Grant Nos.41306208,41276200,41406214,41376190 and 41606217)+4 种基金the scientific Research Foundation of Nanjing University of Information Science and Technology(Grant No.2015r043)the open project of the Polar Research Institute of China(Grant No.KP201301)the Priority Academic Program Development of Jiangsu Higher Education Institutionsthe Jiangsu Government Scholarship for Overseas Studiesthe China Scholarship Council
文摘Based on an eddy permitting ocean general circulation model, the response of water masses to two distinct climate scenarios in the South Pacific is assessed in this paper. Under annually repeating atmospheric forcing that is characterized by different westerlies and associated heat flux, the response of Subantarctic Mode Water（SAMW） and Antarctic Intermediate Water（AAIW） is quantitatively estimated. Both SAMW and AAIW are found to be warmer, saltier and denser under intensified westerlies and increased heat loss. The increase in the subduction volume of SAMW and AAIW is about 19.8 Sv（1 Sv =10-6m-3s-（-1））. The lateral induction term plays a dominant role in the changes in the subduction volume due to the deepening of the mixed layer depth（MLD）. Furthermore, analysis of the buoyancy budget is used to quantitatively diagnose the reason for the changes in the MLD. The deepening of the MLD is found to be primarily caused by the strengthening of heat loss from the ocean to the atmosphere in the formation region of SAMW and AAIW.
