Remotely induced warming of Antarctic Bottom Water in the eastern Weddell gyre
Remotely induced warming of Antarctic Bottom Water in the eastern Weddell gyre
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DOI：
10.1002/grl.50526
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发表时间：
2013-06-16
影响因子：
5.2
通讯作者：
Speer, Kevin L.
中科院分区：
文献类型：
--
作者：
Couldrey, Matthew P.;Jullion, Loic;Speer, Kevin L.
在东经30度的威德尔环流东部的四个重复水文剖面显示，在20世纪90年代中期和21世纪末，从南大洋的印度部分进入环流的南极底层水（AABW）的变暖（类似于0.1摄氏度）和减轻（类似于0.02-0.03千克米（-3））。该地区历史水文和测高测量表明，最可能的解释是增加夹带温暖的中深度绕极深水的级联陆架水羽靠近达恩利角，在那里印度来源的AABW进入威德尔环流从东部通风。夹带的这种变化与该地区南极绕极流（ACC）南部边界的同时向南移动有关。这种AABW变暖的机制可能会影响ACC靠近南极洲的任何地方。
Four repeat hydrographic sections across the eastern Weddell gyre at 30 degrees E reveal a warming (by similar to 0.1 degrees C) and lightening (by similar to 0.02-0.03 kg m(-3)) of the Antarctic Bottom Water (AABW) entering the gyre from the Indian sector of the Southern Ocean between the mid-1990s and late 2000s. Historical hydrographic and altimetric measurements in the region suggest that the most likely explanation for the change is increased entrainment of warmer mid-depth Circumpolar Deep Water by cascading shelf water plumes close to Cape Darnley, where the Indian-sourced AABW entering the Weddell gyre from the east is ventilated. This change in entrainment is associated with a concurrent southward shift of the Antarctic Circumpolar Current's (ACC) southern boundary in the region. This mechanism of AABW warming may affect wherever the ACC flows close to Antarctica.