Sea ice production and water mass modification in the eastern Laptev Sea
Krumpen, Thomas and Hölemann, Jens A. and Willmes, Sascha and Morales Maqueda, Miguel A. and Busche, Thomas and Dmitrenko, Igor A. and Gerdes, Rüdiger and Haas, Christian and Heinemann, Günther and Hendricks, Stefan and Kassens, Heidemarie and Rabenstein, Lasse and Schröder, David (2011) Sea ice production and water mass modification in the eastern Laptev Sea. Journal of Geophysical Research - Oceans, 116 (C05014), pp. 1-17. American Geophysical Union. DOI: 10.1029/2010JC006545. ISSN 0148-0227.
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Official URL: http://www.agu.org/journals/jc/jc1105/2010JC006545/
A simple polynya flux model driven by standard atmospheric forcing is used to investigate the ice formation that took place during an exceptionally strong and consistent western New Siberian (WNS) polynya event in 2004 in the Laptev Sea. Whether formation rates are high enough to erode the stratification of the water column beneath is examined by adding the brine released during the 2004 polynya event to the average winter density stratification of the water body, preconditioned by summers with a cyclonic atmospheric forcing (comparatively weakly stratified water column). Beforehand, the model performance is tested through a simulation of a well-documented event in April 2008. Neglecting the replenishment of water masses by advection into the polynya area, we find the probability for the occurrence of density-driven convection down to the bottom to be low. Our findings can be explained by the distinct vertical density gradient that characterizes the area of the WNS polynya and the apparent lack of extreme events in the eastern Laptev Sea. The simple approach is expected to be sufficiently rigorous, since the simulated event is exceptionally strong and consistent, the ice production and salt rejection rates are likely to be overestimated, and the amount of salt rejected is distrusted over a comparatively weakly stratified water column. We conclude that the observed erosion of the halocline and formation of vertically mixed water layers during a WNS polynya event is therefore predominantly related to wind- and tidally driven turbulent mixing processes.
|Additional Information:||Copyright 2011 by the American Geophysical Union.|
|Title:||Sea ice production and water mass modification in the eastern Laptev Sea|
|Date:||21 May 2011|
|Journal or Publication Title:||Journal of Geophysical Research - Oceans|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 1-17|
|Publisher:||American Geophysical Union|
|Keywords:||polynya, flux model, Laptev Sea, ice production|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W EO - Erdbeobachtung|
|DLR - Research area:||Space|
|DLR - Program:||W EO - Erdbeobachtung|
|DLR - Research theme (Project):||W - Vorhaben Geowissenschaftl. Fernerkundungs- und GIS-Verfahren (old)|
|Institutes and Institutions:||Microwaves and Radar Institute > Radar Concepts|
|Deposited By:||Thomas Edmund Busche|
|Deposited On:||07 Dec 2011 11:30|
|Last Modified:||07 Feb 2013 19:43|
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