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Warming of Waters in an East Greenland Fjord Prior to Glacier Retreat: Mechanisms and Connection to Large-scale Atmospheric Conditions : Volume 5, Issue 3 (09/09/2011)

By Christoffersen, P.

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Book Id: WPLBN0004022507
Format Type: PDF Article :
File Size: Pages 14
Reproduction Date: 2015

Title: Warming of Waters in an East Greenland Fjord Prior to Glacier Retreat: Mechanisms and Connection to Large-scale Atmospheric Conditions : Volume 5, Issue 3 (09/09/2011)  
Author: Christoffersen, P.
Volume: Vol. 5, Issue 3
Language: English
Subject: Science, Cryosphere
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2011
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Mugford, R. I., Joughin, I., M. Syvitsk, J. P., Dowdeswell, J. A., Luckman, A., Christoffersen, P.,...Benham, T. J. (2011). Warming of Waters in an East Greenland Fjord Prior to Glacier Retreat: Mechanisms and Connection to Large-scale Atmospheric Conditions : Volume 5, Issue 3 (09/09/2011). Retrieved from http://www.ebooklibrary.org/


Description
Description: Scott Polar Research Institute, University of Cambridge, Cambridge, UK. Hydrographic data acquired in Kangerdlugssuaq Fjord and adjacent seas in 1993 and 2004 are used together with reanalysis from the NEMO ocean modelling framework to elucidate water-mass change and ice-ocean-atmosphere interactions in East Greenland. The hydrographic data show that the fjord contains warm subtropical waters and that fjord waters in 2004 were considerably warmer than in 1993. The ocean reanalysis shows that the warm properties of fjord waters in 2004 are related to a major peak in oceanic shoreward heat flux into a cross-shelf trough on the outer continental shelf. The heat flux into this trough varies according to seasonal exchanges with the atmosphere as well as from deep seasonal intrusions of subtropical waters. Both mechanisms contribute to high (low) shoreward heat flux when winds from the northeast are weak (strong). The combined effect of surface heating and inflow of subtropical waters is seen in the hydrographic data, which were collected after periods when along-shore coastal winds from the north were strong (1993) and weak (2004). The latter data were furthermore acquired during the early phase of a prolonged retreat of Kangerdlugssuaq Glacier. We show that coastal winds vary according to the pressure gradient defined by a semi-permanent atmospheric high-pressure system over Greenland and a persistent atmospheric low situated near Iceland. The magnitude of this pressure gradient is controlled by longitudinal variability in the position of the Icelandic Low.

Summary
Warming of waters in an East Greenland fjord prior to glacier retreat: mechanisms and connection to large-scale atmospheric conditions

Excerpt
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