Impact of flaw polynyas on the hydrography of the Laptev Sea.

Dmitrenko, Igor A., Tyshko, Konstantin N., Kirillov, Sergey A., Eicken, Hajo, Hölemann, Jens A. and Kassens, Heidemarie (2005) Impact of flaw polynyas on the hydrography of the Laptev Sea. Global and Planetary Change, 48 (1-3). pp. 9-27. DOI 10.1016/j.gloplacha.2004.12.016.

[img] Text
2005_Dmitrenko-etal-Impact_GBC-48.pdf - Published Version
Restricted to Registered users only

Download (1531Kb) | Contact

Supplementary data:

Abstract

Based on hydrological data from 1979 to 1999 the average long-term salinity of the flaw polynya in the Eastern Laptev Sea is estimated. A new method to evaluate ice production based on hydrological rather than sea-ice observations is proposed. Average annual ice production in the polynya ranges between 3 and 4 m. The probability of convective mixing penetrating down to the seafloor is highest in the regions of the flaw polynya, but does not exceed 20% in the Eastern and 70% in the Western Laptev Sea. Conductivity-temperature-depth (CTD) measurements and observations of currents carried out in April-May 1999 allowed us to investigate the surface circulation along the margins of the Laptev Sea flaw polynya. The convective nature of the surface currents, with velocities measured as high as 62 cm/s, is discussed. Currents are most likely part of circulation cells, which arise as a result of brine rejection due to intensive ice formation in the polynya. It is shown that the spatial alignment of sea ice crystals in the marginal part of the polynya is most likely a consequence of the quasi-stationary cellular circulation

Document Type: Article
Additional Information: WOS:000232013000002
Keywords: Hydrography; Polynya; Ice production; Salinity variance; Convection; Arctic Ocean; Fast ice; Export; Leads; Convection
Research affiliation: AWI
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.gloplacha.2004.12.016
ISSN: 0921-8181
Projects: Laptev Sea System, Permafrost
Date Deposited: 03 Dec 2008 16:50
Last Modified: 13 Sep 2017 09:01
URI: http://oceanrep.geomar.de/id/eprint/4776

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...