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Halocline water modification and along-slope advection at the Laptev Sea continental margin

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  • A general pattern in water mass distribution and potential shelf–basin exchange is revealed at the Laptev Sea continental slope based on hydrochemical and stable oxygen isotope data from the summers 2005–2009. Despite considerable interannual variations, a frontal system can be inferred between shelf, continental slope and central Eurasian Basin waters in the upper 100 m of the water column along the continental slope. Net sea-ice melt is consistently found at the continental slope. However, the sea-ice meltwater signal is independent from the local retreat of the ice cover and appears to be advected from upwind locations. In addition to the along-slope frontal system at the continental shelf break, a strong gradient is identified on the Laptev Sea shelf between 122° E and 126° E with an eastward increase of riverine and sea-ice related brine water contents. These waters cross the shelf break at ~140° E and feed the low-salinity halocline water (LSHW, salinity S < 33) in the upper 50 m of the water column. High silicate concentrations in Laptev Sea bottom waters may lead to speculation about a link to the local silicate maximum found within the salinity range of ~33 to 34.5, typical for the Lower Halocline Water (LHW) at the continental slope. However brine signatures and nutrient ratios from the central Laptev Sea differ from those observed at the continental slope. Thus a significant contribution of Laptev Sea bottom waters to the LHW at the continental slope can be excluded. The silicate maximum within the LHW at the continental slope may be formed locally or at the outer Laptev Sea shelf. Similar to the advection of the sea-ice melt signal along the Laptev Sea continental slope, the nutrient signal at 50–70 m water depth within the LHW might also be fed by advection parallel to the slope. Thus, our analyses suggest that advective processes from upstream locations play a significant role in the halocline formation in the northern Laptev Sea.
  • This is the publisher’s final pdf. The published article is copyrighted by the author(s) and published by Copernicus Publications on behalf of the European Geosciences Union. The published article can be found at: http://www.ocean-science.net/.
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  • Bauch, D., Torres-Valdes, S., Polyakov, I., Novikhin, A., Dmitrenko, I., McKay, J., and Mix, A.: Halocline water modification and along-slope advection at the Laptev Sea continental margin, Ocean Science, 10, 141-154. doi:10.5194/os-10-141-2014, 2014.
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  • 10
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  • 1
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  • Nutrient data in 2007 and 2008 were taken as part of the Natural Environment Research Council (UK) funded Arctic Synoptic Basin-wide Oceanography (ASBO) IPY consortium grant. D. Bauch acknowledges funds from the German Research Foundation grants SP 526/3 and BA 1689/2-1 as well as grant 03G0639D funded by the BMBF within the German–Russian cooperation “Laptev Sea System”. A. Novikhin acknowledges funding through the Federal Ministry of Education and Research project Otto-Schmidt-Laboratory for Polar and Marine Sciences. I. Polyakov thanks NSF, CIFAR, JAXA and JAMSTERC for support. I. Dmitrenko received financial support from the Canadian Excellence Research Chair (CERC) program and also by the BMBF within the German–Russian cooperation “Laptev Sea System” under grant 03G0639A.
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