Changes in vertical stability of the Laptev Sea upper layer under the ice cover shrinkage
Abstract
The main criteria of the vertical stability of water in the upper 100-meter layer of the Laptev Sea are calculated from the reconstructed spatial-temporal variability of the three-dimensional structure of temperature and salinity, obtained on the basis of numerical experiments using the regional configuration of the NEMO mathematical model adapted to the conditions of the Arctic Ocean. The modeling results are presented on a vertical section crossing both shallow and deep-water parts of the sea. The structural changes in the distribution of vertical water stability were revealed for warm periods in the beginning of the XXI century with the ice cover shrinkage. During these periods the situations favoring the development of a full vertical stability of waters are more frequent. The range of changes of the Brunt-Väisälä frequency in the «warm» years decreases against the «cold» year of 2004. The depth of the layer with maximum values of the Brunt-Väisälä frequency increases during the periods of ice melting. At the same time the negative thermohaline stability is more intensive in spring in shallow areas of the sea, extending into a deeper surface layer. During winter period of «warm» years the area of the section with a positive criterion of thermohaline stability decreases both for the deep-water and the shallow-water parts of the section. The depth of the layer with negative values of the density ratio reaches the highest values during summer periods of the «warm» years.
Supporting agencies: The study was financially supported by the Ministry of Science and Higher Education of the Russian Federation (the project no. ID RFMEFI61617X0076).
About the Authors
A. V. Danshina
Arctic and Antarctic Research Institute
Russian Federation
Department of Oceanology, Scientific Researcher, PhD in Physics and Mathematics
Russian Federation
Department of Oceanology, Scientific Researcher, PhD in Physics and Mathematics
V. V. Ivanov
Lomonosov Moscow State University
Russian Federation
Russian Federation
Faculty of Geography, Department of Oceanology, Leading Scientific Researcher, D.Sc. in Physics and Mathematics
V. Yu. Chantsev
Russian State Hydrometeorological University
Russian Federation
Russian Federation
Department of Applied Oceanography and Integrated Coastal Zone Management, Associate Professor, PhD in Geography
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For citations:
Danshina A.V., Ivanov V.V., Chantsev V.Yu. Changes in vertical stability of the Laptev Sea upper layer under the ice cover shrinkage. Vestnik Moskovskogo universiteta. Seriya 5, Geografiya. 2020;(6):110-120. (In Russ.)
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