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The Impact of Overturning and Horizontal Circulation in Pine Island Trough on Ice Shelf Melt in the Eastern Amundsen Sea

Artikel i vetenskaplig tidskrift
Författare B. G. M. Webber
K. J. Heywood
D. P. Stevens
Karen Assmann
Publicerad i Journal of Physical Oceanography
Volym 49
Nummer/häfte 1
Sidor 63-83
ISSN 0022-3670
Publiceringsår 2019
Publicerad vid Institutionen för marina vetenskaper
Sidor 63-83
Språk en
Länkar dx.doi.org/10.1175/jpo-d-17-0213.1
Ämnesord Antarctica, Baroclinic flows, Barotropic flows, Meridional overturning circulation, Decadal variability, circumpolar deep-water, glacial meltwater, ocean circulation, continental-shelf, variability, embayment, inflow, sensitivity, antarctica, transport, Oceanography
Ämneskategorier Marin ekologi

Sammanfattning

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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