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Upwelling or differential cooling? Analysis of satellite SST images of the Southeastern Baltic Sea

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Abstract

The results of comparative analysis of sea surface temperature variations along horizontal sections in the coastal zone are given. The data used had been taken by MODIS spectroradiometers (Aqua, Terra) in the Southeastern Baltic, in periods of coastal upwelling—in the periods of autumn differential cooling over coastal continental slopes (facilitating water subsidence along these slopes). Studying 135 SST images of coastal upwelling events in May–October 2000–2014 and four cooling events in October–November 2002, 2004, 2005, and 2009 revealed the specific features of the shape of horizontal temperature profiles on sea surface along sections over coastal continental slopes. In addition to the higher differences between water surface temperatures in the deep and coastal parts of the sea (up to 14°C), upwelling features an appreciable distance from the cold-water core to the coast (up to 3–15 km) and a variable shape of horizontal profiles of water temperature on the sea surface along the sections. Conversely, during autumn differential cooling, water temperature difference on the surface is relatively small, the shape of the dependence of surface water temperature on the distance to the shore does not change over time, varies only slightly with the alongshore displacement of the section, and shows low sensitivity to bathymetry and even to wind effect. Thus, the analysis of the shape of the temperature on the sea surface along horizontal sections over coastal continental slopes enables the diagnostics of the regime of vertical water exchange in the coastal zone.

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Authors and Affiliations

  1. Shirshov Institute of Oceanology, Russian Academy of Sciences, Atlantic Branch, Kaliningrad, 236022, Russia

    E. E. Esiukova, I. P. Chubarenko & Zh. I. Stont

  2. Immanuel Kant Baltic Federal University, Kaliningrad, 236014, Russia

    Zh. I. Stont

Authors
  1. E. E. Esiukova
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  2. I. P. Chubarenko
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  3. Zh. I. Stont
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Correspondence to E. E. Esiukova.

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Original Russian Text © E.E. Esiukova, I.P. Chubarenko, Zh.I. Stont, 2017, published in Vodnye Resursy, 2017, Vol. 44, No. 1, pp. 28–37.

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Esiukova, E.E., Chubarenko, I.P. & Stont, Z.I. Upwelling or differential cooling? Analysis of satellite SST images of the Southeastern Baltic Sea. Water Resour 44, 69–77 (2017). https://doi.org/10.1134/S0097807817010043

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  • DOI: https://doi.org/10.1134/S0097807817010043

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