The Impact of Overturning and Horizontal Circulation in Pine Island Trough on Ice Shelf Melt in the Eastern Amundsen Sea
The Impact of Overturning and Horizontal Circulation in Pine Island Trough on Ice Shelf Melt in the Eastern Amundsen Sea
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松岛海槽翻转和水平环流对东阿蒙森海冰架融化的影响
DOI：
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发表时间：
2019
影响因子：
3.5
通讯作者：
K. Assmann
中科院分区：
文献类型：
--
作者：
B. Webber;K. Heywood;D. Stevens;K. Assmann
阿蒙森海周围的冰架正在迅速融化，这是由于相对温暖的海水循环进入它们的洞穴。然而，很少有人知道的过程，确定这种循环的变化。在这里，我们使用的海洋环流模式来诊断的相对重要性，水平和垂直（翻转）流通内松岛槽，导致松岛和思韦茨冰架。我们发现，融化率和向南绕极深水（CDW）运输协变大陆架的大部分地区在年际到十年的时间尺度。这种变化的主要外部强迫机制是大陆架和大陆架断裂处的埃克曼抽吸作用，这与以前的研究一致。在陆架坡折处，CDW和热量的向南输送以正压为主。在松岛海槽的更南部，向北和向南的正压热量输送大部分被抵消，大部分向南的净温度输送是由斜压和翻转环流促成的。翻转环流是有关的水质量转换和浮力增益的货架上，主要是由淡水输入从基底融化。
The ice shelves around the Amundsen Sea are rapidly melting as a result of the circulation of relatively warm ocean water into their cavities. However, little is known about the processes that determine the variability of this circulation. Here we use an ocean circulation model to diagnose the relative importance of horizontal and vertical (overturning) circulation within Pine Island Trough, leading to Pine Island and Thwaites ice shelves. We show that melt rates and southward Circumpolar Deep Water (CDW) transports covary over large parts of the continental shelf at interannual to decadal time scales. The dominant external forcing mechanism for this variability is Ekman pumping and suction on the continental shelf and at the shelf break, in agreement with previous studies. At the continental shelf break, the southward transport of CDW and heat is predominantly barotropic. Farther south within Pine Island Trough, northward and southward barotropic heat transports largely cancel, and the majority of the net southward temperature transport is facilitated by baroclinic and overturning circulations. The overturning circulation is related to water mass transformation and buoyancy gain on the shelf that is primarily facilitated by freshwater input from basal melting.
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影响因子：
30.7
作者：
Favier, L.;Durand, G.;Le Brocq, A. M.
通讯作者：
Le Brocq, A. M.
影响因子：
3.2
作者：
Losch, Martin;Menemenlis, Dimitris;Hill, Chris
通讯作者：
Hill, Chris
影响因子：
4.4
作者：
Jones, R. W.;Renfrew, I. A.;Lazzara, M. A.
通讯作者：
Lazzara, M. A.
影响因子：
5.2
作者：
Christianson, Knut;Bushuk, Mitchell;Holland, David M.
通讯作者：
Holland, David M.
影响因子：
5.2
作者：
Snow K
通讯作者：
Snow K