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Heat Loss from the Atlantic Water Layer in the St. Anna Trough (Northern Kara Sea): Causes and Consequences : Volume 11, Issue 1 (20/02/2014)

By Dmitrenko, I. A.

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Book Id: WPLBN0004020836
Format Type: PDF Article :
File Size: Pages 31
Reproduction Date: 2015

Title: Heat Loss from the Atlantic Water Layer in the St. Anna Trough (Northern Kara Sea): Causes and Consequences : Volume 11, Issue 1 (20/02/2014)  
Author: Dmitrenko, I. A.
Volume: Vol. 11, Issue 1
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Kirillov, S. A., Koldunov, N. V., Serra, N., Makhotin, M., Aksenov, Y., Dmitrenko, I. A.,...Barber, D. (2014). Heat Loss from the Atlantic Water Layer in the St. Anna Trough (Northern Kara Sea): Causes and Consequences : Volume 11, Issue 1 (20/02/2014). Retrieved from

Description: Centre for Earth Observation Science, University of Manitoba, Winnipeg, Canada. A distinct, subsurface density front along the eastern St. Anna Trough in the northern Kara Sea is inferred from hydrographic observations in 1996 and 2008–2010. Direct velocity measurements show a persistent northward subsurface current (~ 20 cm s−1) along the St. Anna Trough eastern flank. This sheared flow, carrying the outflow from the Barents and Kara Seas to the Arctic Ocean, is also evident from shipboard observations as well as from geostrophic velocities and numerical model simulations. Although no clear evidence for the occurrence of shear instabilities could be obtained, we speculate that the enhanced vertical mixing along the St. Anna Trough eastern flank promoted by a vertical velocity shear favors the upward heat loss from the intermediate warm Atlantic water layer. The associated upward heat flux is inferred to 50–100 W m−2 using hydrographic data and model simulations. The zone of lowered sea ice thickness and concentration essentially marks the Atlantic water pathway in the St. Anna Trough and adjacent Nansen Basin continental margin from both sea-ice remote sensing observations and model simulations. In fact, the seaice shows a consistently delayed freeze-up onset during fall and a reduction in the seaice thickness during winter. This is consistent with our results on the enhanced Atlantic water heat loss along the Atlantic water pathway in the St. Anna Trough.1

1Dedicated to the memory of our colleague Klaus Hochheim who tragically lost his life in the Arctic expedition in September 2013

Heat loss from the Atlantic water layer in the St. Anna Trough (northern Kara Sea): causes and consequences

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