South Atlantic interbasin exchanges of mass, heat, salt and anthropogenic carbon
South Atlantic interbasin exchanges of mass, heat, salt and anthropogenic carbon
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DOI：
10.1016/j.pocean.2016.11.005
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发表时间：
2017-02-01
影响因子：
4.1
通讯作者：
van Heuven, S. M. A. C.
中科院分区：
文献类型：
--
作者：
Evans, G. R.;McDonagh, E. L.;van Heuven, S. M. A. C.
南大西洋南纬24度以南与邻近海洋盆地之间的物质、热量、盐分和人为碳（Cant）交换是根据2008-2009年期间使用逆方法获得的水文数据估算的。计算了西部（德雷克海峡）、东部（东经30度）和北方（南纬24度）边界的人为碳输送量。0.09 Sv的淡水翻转输送是向南的，与从北大西洋输出淡水的翻转环流相一致，并且在过量淡水扰动的条件下，与经向翻转环流（MOC）相一致。在30度E，净东南极绕极流（ACC）的运输，南部的副热带锋，是由一个15.9 +/- 2.3西弗向西流沿着南极边界补偿。整个区域是大气人为碳的一个重要汇，为0.5 +/- 0.37 Pg C yr（-1），其中0.18 +/- 0.12 Pg C yr（-1）积累并储存在水柱中。在24 ° S时，20.2 Sv角的倾覆与0.11 Pg C yr（-1）Cant倾覆有关。其余的被输送到24 ° S以北的大西洋（0.28 +/- 0.16 Pg C yr（-1））和南大洋的印度部分（1.12 0.43 Pg C yr（-1）），通过德雷克海峡（1.07 0.44 Pg C yr-1）流入增强。这突出表明南大西洋作为全球海洋人为碳汇的一个关键因素的重要性。(C)2016爱思唯尔有限公司版权所有
The exchange of mass, heat, salt and anthropogenic carbon (Cant) between the South Atlantic, south of 24 degrees S, and adjacent ocean basins is estimated from hydrographic data obtained during 2008-2009 using an inverse method. Transports of anthropogenic carbon are calculated across the western (Drake Passage), eastern (30 degrees E) and northern (24 degrees S) boundaries. The freshwater overturning transport of 0.09 Sv is southward, consistent with an overturning circulation that exports freshwater from the North Atlantic, and consistent with a bistable Meridional Overturning Circulation (MOC), under conditions of excess freshwater perturbation. At 30 degrees E, net eastward Antarctic Circumpolar Current (ACC) transport, south of the Subtropical Front, is compensated by a 15.9 +/- 2.3 Sv westward flow along the Antarctic boundary. The region as a whole is a substantial sink for atmospheric anthropogenic carbon of 0.5 +/- 0.37 Pg C yr(-1), of which 0.18 +/- 0.12 Pg C yr(-1) accumulates and is stored within the water column. At 24 degrees S, a 20.2 Sv meridional overturning is associated with a 0.11 Pg C yr(-1) Cant overturning. The remainder is transported into the Atlantic Ocean north of 24 degrees S (0.28 +/- 0.16 Pg C yr(-1)) and Indian sector of Southern Ocean (1.12 0.43 Pg C yr(-1)), having been enhanced by inflow through Drake Passage (1.07 0.44 Pg C yr-1). This underlines the importance of the South Atlantic as a crucial element of the anthropogenic carbon sink in the global oceans. (C) 2016 Elsevier Ltd. All rights reserved.