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Halocline Water Modification and Along Slope Advection at the Laptev Sea Continental Margin : Volume 10, Issue 5 (12/09/2013)

By Bauch, D.

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Book Id: WPLBN0004020717
Format Type: PDF Article :
File Size: Pages 37
Reproduction Date: 2015

Title: Halocline Water Modification and Along Slope Advection at the Laptev Sea Continental Margin : Volume 10, Issue 5 (12/09/2013)  
Author: Bauch, D.
Volume: Vol. 10, Issue 5
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Polyakov, I., Torres-Valdes, S., Novikhin, A., Bauch, D., Mix, A., Mckay, J., & Dmitrenko, I. (2013). Halocline Water Modification and Along Slope Advection at the Laptev Sea Continental Margin : Volume 10, Issue 5 (12/09/2013). Retrieved from http://worldlibrary.net/


Description
Description: GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1–3, 24148 Kiel, Germany. A general pattern in water mass distribution and potential shelf-basin exchanges is revealed at the Laptev Sea continental slope based on hydrochemical and stable oxygen isotope data from 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 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. Extremely high silicate concentrations in Laptev Sea bottom waters may lead to speculation on 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. But brine signatures and nutrient ratios from the central Laptev Sea differ from those 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 upwind locations play a significant role in the halocline formation in the northern Laptev Sea.


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

Excerpt
Anderson, L. G., Andersson, P. S., Björk, G., Peter Jones, E., Jutterström, S., and Wåhlström, I.: Source and formation of the upper halocline of the Arctic Ocean, J. Geophys. Res.-Oceans, 118, 410–421, doi:10.1029/2012JC008291, 2013.; Bareiss, J. and Görgen, K.: Spatial and temporal variability of sea ice in the Laptev Sea: Analyses and review of satellite passive-microwave data and model results, 1979 to 2002, Global Planet. Change, 48, 28–54. doi:10.1016/j.gloplacha.2004.12.004, 2005.; Bareiss, J., Eicken, H., Helbig, A., and Martin, T.: Impact of river discharge and regional climatology on the decay of sea ice in the Laptev Sea during spring and early summer, Arct. Antarct. Alp. Res., 31, 214–229, 1999.; Bauch, D., Schlosser, P., and Fairbanks, R. F.: Freshwater balance and the sources of deep and bottom waters in the Arctic Ocean inferred from the distribution of H218O, Prog. Oceanogr., 35, 53–80, 1995.; Bauch, D., Erlenkeuser, H., and Andersen, N.: Water mass processes on Arctic shelves as revealed from 18O of H2O, Global Planet. Change, 48, 165–174, doi:10.1016/j.gloplacha.2004.12.011, 2005.; Bauch, D., Dmitrenko, I. A., Wegner, C., Hölemann, J., Kirillov, S. A., Timokhov, L. A., and Kassens, H.: Exchange of Laptev Sea and Arctic Ocean halocline waters in response to atmospheric forcing, J. Geophys. Res.-Oceans, 114, C05008, doi:10.1029/2008JC005062, 2009.; Bauch, D., Hölemann, J., Andersen, N., Dobrotina, E., Nikulina, A., and Kassens, H.: The Arctic shelf regions as a source of freshwater and brine-enriched waters as revealed from stable oxygen isotopes, Polarforschung, 80, 127–140, 2010.; Aagaard, K., Coachman, L., and Carmack, E.: On the halocline of the Arctic Ocean, Deep-Sea Res., 28, 529–545, 1981.; Abrahamsen, E. P., Meredith, M. P., Falkner, K. K., Torres-Valdes, S., Leng, M. J., Alkire, M. B., Bacon, S., Laxon, S., Polyakov, I., Ivanov, V., and Kirillov, S.: Tracer-derived freshwater budget of the Siberian Continental Shelf following the extreme Arctic summer of 2007, Geophys. Res. Lett., 36, L07602, doi:10.1029/2009GL037341, 2009.; Aksenov, Y., Ivanov, V. V., Nurser, A. J. G., Bacon, S., Polyakov, I. V., Coward, A. C., Naveira-Garabato, A. C., and Beszczynska-Moeller, A.: The Arctic Circumpolar Boundary Current, J. Geophys. Res.-Oceans, 116, C09017, doi:10.1029/2010JC006637, 2011.; Bauch, D., Gröger, M., Dmitrenko, I., Hölemann, J., Kirillov, S., Mackensen, A., Taldenkova, E., and Andersen, N.: Atmospheric controlled freshwater water release at the Laptev Sea Continental margin, Polar Res., 30, 5858, doi:10.3402/polar.v30i0.5858, 2011a.; Bauch, D., Rutgers van der Loeff, M., Andersen, N., Torres-Valdes, S., Bakker, K., and Abrahamsen, E. P.: Origin of freshwater and polynya water in the Arctic Ocean halocline in summer 2007, Prog. Oceanogr., 91, 482–495, doi:10.1016/j.pocean.2011.07.017, 2011b.; Bauch, D., Hölemann, J. A., Dmitrenko, I. A., Janout, M. A., Nikulina, A., Kirillov, S. A., Krumpen, T., Kassens, H., and Timokhov, L.: The impact of Siberian coastal polynyas on shelf-derived Arctic Ocean halocline waters, J. Geophys. Res.-Oceans, 117, C00G12, doi:10.1029/2011JC007282, 2012.; Bauch, D., Hölemann, J. A., Nikulina, A., Wegner, C., Janout, M. A., Timokhov, L. A., and Kassens, H.: Correlation of river water and local sea-ic

 

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