Turbulent heat fl uxes in the southern part of the Baltic Sea

The study deals with the analysis of turbulent heat flux for several sites in the Baltic Sea (D6 platform, Arkona station and Darss Sill station) using various calculation methods. Sensible and latent heat fluxes were calculated using the aerodynamic method, as well as the COARE algorithm with different parameterizations. The calculations were based on data from weather stations, reanalysis, modeling, and measurement of wind wave parameters, as well as measurements of the anchored thermistor chain on the D6 IROP. The study covers the period from January to December 2016. As a result, it was found that when using the COARE method with Charnok parameterization, with constant coefficients of heat and moisture exchange (Constant method), the amount of sensible heat flux increases by 15%, and that of latent heat by 6% as compared to the aerodynamic method. The greatest differences in the flux values calculated by different methods are observed during severe storms with wave heights of more than 3 m and can exceed 50 W/m2.

The proportions of daily, synoptic, and seasonal variability, as well as the harmonic parameters of the daily and annual course, were estimated based on the dispersion and harmonic analysis of the heat flux series. 

1. Aleksandrov S.V. Vliyanie klimaticheskikh izmenenii na uroven’ evtrofirovaniya Kurshskogo zaliva (The impact of climate change on the level of eutrophication in the Curonian Lagoon), Vestn. Baltijskogo federal’nogo un-ta im. I. Kanta, Seriya: Estestvennye i meditsinskie nauki, 2010, no. 1, p. 49–57. (In Russian)

2. Averkiev A.S., Dubravin V.F. Tochnost’ rascheta ispareniya pri raznykh periodakh osred-neniya po dannym nablyudenii v Yuzhnoi Baltike [Calculation accuracy of evaporation at different averaging periods by observation data in the Southern Baltic], Gidrometeorologiya i Ekologiya, 2020, no. 58, p. 68–82. (In Russian)

3. Blanc T.V. Variation of Bulk-Derived Surface Flux, Stability, and Roughness Results Due to the of Different Transfer Coeffcient Schemesю, J. Phys. Oceanogr., 1985, vol. 15, no. 6, р. 650–669.

4. Bortkovskii R.S. Raschet turbulentnykh potokov tepla, vlagi i kolichestva dvizheniya nad morem po dannym sudovykh izmerenii [Calculation of turbulent heat, moisture and momentum flows over the sea according to ship measurements], Meteorologiya i gidrologiya, 1971, no. 3, p. 93– 98. (In Russian)

5. Charnock H. Wind stress on a water surface, Q. J. Roy. Meteor. Soc., vol. 81, 639–640.

6. Cronin M.F., Gentemann C.L., Edson J. et al. Air-Sea Fluxes With a Focus on Heat and Momentum, Front. Mar. Sci., 2019, vol. 6, 430.

7. Döscher R., Meier H.E. Simulated Sea surface temperature and heat fluxes in different climates of the Baltic Sea, Ambio, 2004, vol. 33, no. 4/5, p. 242–248.

8. Dubravin V.F. Evolyutsii gidrometeorologicheskikh polei v Baltiiskom more [Evolution of hydrometeorological fields in the Baltic Sea], Kaliningrad, Kapros Publ., 2014, 438 p. (In Russian)

9. Dubravin V.F., Kapustina M.V., Stont Zh.I. Otsenki potokov tepla na granitse voda-vozdukh v yugo-zapadnoi chasti Baltiki (2003–2016) [Estimates of heat fluxes at the water-air border in the South-Western part of the Baltic Sea (2003–2016)], Izvestiya Russkogo geograficheskogo obshchestva, 2019, vol. 151, no. 4, p. 15–26. (In Russian)

10. Efimov V.V., Timofeev N.A., Sychev E.N. et al. O raschete koeffitsientov teplo- i vlagoobmena mezhdu okeanom i atmosferoi [Estimate of the Ocean-Atmosphere exchange], Izv. AN SSSR. FAO, 1985, vol. 21, no. 7, p. 664– 667. (In Russian)

11. Fairall C.W., Bradley E.F., Hare J.E. et al. Bulk Parameterization of Air – Sea Fluxes: Updates and Verification for the COARE Algorithm, J. Climate, 2003, vol. 16, p. 571–591.

12. Gulev S., Belyaev K. Probability Distribution Characteristics for Surface Air – Sea Turbulent Heat Fluxes over the Global Ocean, J. Climate, 2012, vol. 25, p. 184–206.

13. Gulev S.K., Ukrainskii V.V. Rol’ razlichnykh vremennykh masshtabov v protsessakh energo-obmena okeana i atmosfery [The role of different time scales in the processes of ocean and atmosphere energy exchange], Izv. AN SSSR. FAO, 1989, vol. 25, no. 7, p. 675–687. (In Russian)

14. Lappo S.S., Gulev S.K., Rozhdestvenskii A.E. Krupnomasshtabnoe teplovoe vzaimodejstvie v sisteme okeanatmosfera i energoaktivnye oblasti Mirovogo okeana [Large-scale thermal interaction within the ocean–atmosphere system and the energy-active areas of the World Ocean], Leningrad, Gidrometeoizdat Publ., 1990, 336 p. (In Russian)

15. Larsén X., Smedman A., Högström U. Air – sea exchange of sensible heat over the Baltic Sea, Q. J. R. Meteorol. Soc., 2006, vol. 130, p. 519–539.

16. Meier H.E.M., Doscher R. Simulated water and heat cycles of the Baltic Sea using a 3D coupled atmosphere-iceocean model, Boreal. Env. Res., 2002, vol. 7, p. 327–334.

17. Myslenkov S.A., Medvedeva A.Yu. Wave energy resources of the Baltic Sea and coastal zone of the Kaliningrad Region, Fundamental and Applied Hydrophysics, 2019, vol. 12, no. 2, p. 34–42.

18. Myslenkov S., Shestakova A., Chechin D. The impact of sea waves on turbulent heat fluxes in e Barents Sea according to numerical modelling, Atmos. Chem. Phys., 2021, vol. 21, p. 5575–5595.

19. Myslenkov S.A., Krechik V.A., Solov’ev D.M. Analiz temperatury vody v pribrezhnoi zone Baltiiskogo morya po sputnikovym dannym i izmereniyam termokosy [Water temperature analysis in the coastal zone of the Baltic Sea based on thermistor chain measurements and satellite data], Trudy Gidromettsentra Rossii, 2017, no. 364, p. 159–169. (In Russian)

20. Omstedt A. Baltic Sea marine system: In introduction, University of Gothenburg, Göteborg, 2009, 37 p.

21. Oost W.A., Komen G.J., Jacobs C.M.J. et al. New evidence for a relation between wind stress and wave age from measurements during ASGAMAGE, Bound. Lay. Meteorol., 2002, vol. 103. p. 409–438.

22. Radikevich V.M. O raschete potokov tepla, vlagi i kolichestva dvizheniya [On the calculation of heat, moisture and momentum fluxes], Okeanologiya, 1970, vol. x, vyp. 5, p. 878–882. (In Russian)

23. Rak D., Wieczorek P. Variability of temperature and salinity over the last decade in selected regions of the southern Baltic Sea, Oceаnologiа, 2012, no. 54(3), p. 339–354.

24. Rukovodstvo po aviatsionnoi meteorologii [Guidance on aeronautical meteorology], 2008, Zakaza no. 8896, ISBN 978-92-9231, 179 p. (In Russian)

25. Rutgersson A., Smedman A., Omstedt A. Measured аnd Simulated Latent аnd Sensible Heat Fluxes аt Two Marine Sites in the Baltic Sea, Boundary-Layer Meteorology, 2001, vol. 99, p. 53–84.

26. State and Evolution of the Baltic Sea, 1952–2005, A Detailed 50-year Survey of Meteorology and Climate, Physics, Chemistry, Biology, and Marine Environment, Editors, R. Feistel, G. Nausch, N. Wasmund (еds.), 2008.

27. Störmer O. Climate Change Impacts on Coastal Waters of the Baltic Sea, Global Change and Baltic Coastal Zones, Dordrecht, Springer, 2011, vol. 1, p. 51–69.

28. Taylor P.K., Yelland M.J. The Dependence of Sea Surface Roughness on the Height and Steepness of the Waves, J. Phys. Ocean., 31, 572–590.