Seasonal and long-term changes of turbulent heat fluxes between sea and atmosphere in western sector of the Russian Arctic
Abstract
The current regime of turbulent heat exchange with the atmosphere over the Barents and Kara Seas was investigated, and its spatial, seasonal and temporal variability during 1979–2018 was estimated by the root-mean-square deviation values. It is shown that in recent decades the localization of the centers of maximum energy exchange between the sea surface and the atmosphere was practically the same as in the middle and second half of the 20th century. The highest seasonal and synoptic variability of heat fluxes is typical for the central and western parts of the Barents Sea. In the cold season both indicators of variability are 2–5 and more times higher than in the warm season, and the spatial heterogeneity of variability indicators in winter is about twice that in summer. Quantitative estimates have shown that winter spatial variability of fluxes within the Barents Sea may exceed summer values 5 to 10 times or more. The most pronounced heterogeneity of fluxes field over the Kara Sea is typical for autumn and early winter seasons.
Calculated annual amounts of sensible and latent heat fluxes from the surface of the Barents Sea exceed the values for the Kara Sea by an average of 3–4 and 5–6 times, respectively; and in some years they may differ by tens of times. For the period under study no single trend of the annual magnitude of integral sensible and latent heat fluxes over the water area was recorded, although there are multi-years decadal fluctuations. It is shown that, despite the significant difference in thermal regime of the Barents and Kara seas and lower atmosphere above them, the inter-annual changes in the total turbulent flows are quite well synchronized. This indicates the common character of large-scale hydrometeorological processes, influencing the energy exchange between the seas and the atmosphere.
Supporting agencies: This work was financially supported by the Russian Foundation for Basic Research (project no. 18-05-60083), State Assignment (CITIS number: AAAA-A16-116032810086-4), and the Development Program of the Interdisciplinary Scientific and Educational School of Moscow State University "The Future of the Planet and the Development of the Environment". We thank A.A. Krylov for assistance in preparing the initial data.
About the Authors
G. V. Surkova
Lomonosov Moscow State University
Russian Federation
Russian Federation
Faculty of Geography, Department of Meteorology and Climatology, Professor, D.Sc. in Geography
V. A. Romanenko
Lomonosov Moscow Sta te University
Russian Federation
Russian Federation
Faculty of Geography, Department of Meteorology and Climatology, student
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For citations:
Surkova G.V., Romanenko V.A. Seasonal and long-term changes of turbulent heat fluxes between sea and atmosphere in western sector of the Russian Arctic. Vestnik Moskovskogo universiteta. Seriya 5, Geografiya. 2021;(4):74-82. (In Russ.)
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