Modified halocline water over the Laptev Sea continental margin : historical data analysis

Historical hydrographic data (1940s–2010) show a distinct cross-slope difference of the lower halocline water (LHW) over the Laptev Sea continental margins. Over the slope, the LHW is on average warmer and saltier by 0.2°C and 0.5 psu, respectively, relative to the off-slope LHW. The LHW temperature...

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Bibliographic Details
Published in:Journal of Climate
Main Authors: Dmitrenko, Igor A., Kirillov, Sergey A., Ivanov, Vladimir V., Rudels, Bert, Nuno, Serra, Koldunov, Nikolay V.
Format: Article in Journal/Newspaper
Language:English
Published: AMS (American Meteorological Society) 2012
Subjects:
Laptev Sea
laptev
North Atlantic
Sea ice
Online Access:https://oceanrep.geomar.de/id/eprint/25989/
https://oceanrep.geomar.de/id/eprint/25989/7/2012_Dmitrenko.pdf
https://doi.org/10.1175/JCLI-D-11-00336.1
Description
Summary:Historical hydrographic data (1940s–2010) show a distinct cross-slope difference of the lower halocline water (LHW) over the Laptev Sea continental margins. Over the slope, the LHW is on average warmer and saltier by 0.2°C and 0.5 psu, respectively, relative to the off-slope LHW. The LHW temperature time series constructed from the on-slope historical records are related to the temperature of the Atlantic Water (AW) boundary current transporting warm water from the North Atlantic Ocean. In contrast, the on-slope LHW salinity is linked to the sea ice and wind forcing over the potential upstream source region in the Barents and northern Kara Seas, as also indicated by hydrodynamic model results. Over the Laptev Sea continental margin, saltier LHW favors weaker salinity stratification that, in turn, contributes to enhanced vertical mixing with underlying AW.

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