ON WIND STRESS CURL SEASON VARIABILITY OVER THE BLACK SEA

E.A. Averyanova, A.V. Gubarev, A.B. Polonsky

 Institute of Natural and Technical Systems, RF, Sevastopol, Lenin St., 28

E-mail: eisal@mail.ru, alexgub@inbox.ru, apolonsky5@mail.ru

DOI: 10.33075/2220-5861-2019-4-81-90

UDC 551.553.11, 551.553.2, 551.465.7

Abstract:

     Features of the season variability of wind stress curl over the Black Sea based on the data on meridional and zonal components of wind speed vector over the period 1980–2018 from the reanalyzes of NCEP-DOE, ERA-Interim, MERRA2, JRA-55 are revealed.

     In general, the spatial structures of the wind stress curl, constructed according to the reanalyzes of MERRA2, JRA-55, and ERA-Interim, are in good agreement with each other. The structure of the wind stress curl, constructed by reanalysis of NCEP-DOE, is much smoother due to a worse spatial resolution of the data array. Average annual cyclonic wind stress curl predominates in most areas of the Black Sea during the studied period.

     Seasonal cycle of the wind stress curl calculated from all reanalyzes and averaged over the Black Sea area, shows that the lowest sea-averaged values ​​of wind stress curl are registered for June and July, and the highest – for February. The largest seasonal wind stress curl variations are obtained from the reanalysis of NCEP-DOE, and the smallest – from the reanalysis of JRA-55.

     The highest amplitude of wind stress curl seasonal variation is obtained for the southeastern part of the sea near the Turkish coast (between 30° E and 35° E), over the waters of the Bosphorus, Caucasus, Batumi anticyclonic quasistationary sea eddies. The spatial distribution of areas of the maximum seasonal variation fits well ERA-Interim and MERRA2 data.

     Cyclonic vorticity prevails in most of the sea in period from November to April according to results of wind stress curl calculated from all reanalysis data. However, the values ​​of the maxima of cyclonic vorticity according to various reanalyzes can differ by ((10 ÷ 20) ⋅10-8 Pa/m). The area of ​​regions with anticyclonic vorticity is the largest in summer period, according to all reanalysis data. The maximum values of monthly average ​​anticyclonic wind stress curl for all reanalyzes are shown for August in western part of the sea.

Keywords: Black Sea, wind stress curl, atmospheric reanalyses, season variability.

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[IEEE] E. A. Averyanova, A. V. Gubarev, and A. B. Polonsky, “ON WIND STRESS CURL SEASON VARIABLITY OVER THE BLACK SEA,” Monitoring systems of environment, vol. 4, pp. 81–90, Dec. 2019.

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