Estimating the seasonal impact of optically significant water constituents on surface heating rates in the western Baltic Sea

Cahill, Bronwyn E.; Kowalczuk, Piotr; Kritten, Lena; Gräwe, Ulf; Wilkin, John; Fischer, Jürgen

doi:https://doi.org/10.5194/bg-20-2743-2023

Articles | Volume 20, issue 13

https://doi.org/10.5194/bg-20-2743-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/bg-20-2743-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 20, issue 13

Research article

|

13 Jul 2023

Research article |

| 13 Jul 2023

Estimating the seasonal impact of optically significant water constituents on surface heating rates in the western Baltic Sea

Bronwyn E. Cahill, Piotr Kowalczuk, Lena Kritten, Ulf Gräwe, John Wilkin, and Jürgen Fischer

Supplement

https://doi.org/10.5194/bg-20-2743-2023-supplement

Data sets

MERIS FRS L2 CDOM absorption monthly climatology Western Baltic Sea Jakob Röhrenbach and Bronwyn Cahill https://doi.org/10.5281/zenodo.7753425

Improvements of the Daily Optimum Interpolation Sea Surface Temperature (DOISST) Version 2.1 (https://psl.noaa.gov/data/gridded/data.noaa.oisst.v2.highres.html) B. Huang, C. Liu, V. Banzon, E. Freeman, G. Graham, B. Hankins, T. Smith, and H.-M. Zhang https://doi.org/10.1175/JCLI-D-20-0166.1

Baltic Sea Ocean Colour Plankton, Reflectances, Transparency and Optics L3 NRT daily observations Satellite observations https://doi.org/10.48670/moi-00294

Model code and software

Bio-Optic bio-shortwave model code, initial conditions, river and boundary forcing Bronwyn Cahill https://doi.org/10.5281/zenodo.7215110

Ocean forecasting in terrain-following coordinates: Formulation and skill assessment of the Regional Ocean Modeling System (https://www.myroms.org/) D. Haidvogel, H. Arango, W. Budgell, B. Cornuelle, E. Curchitser, E. Lorenzo, K. Fennel, W. Geyer, A. Hermann, L. Lanerolle, J. Levin, J. McWilliams, J. Miller, A. Moore, T. Powell, A. Shchepetkin, C. Sherwood, R. Signell, J. Warner, and J. Wilkin https://doi.org/10.1016/j.jcp.2007.06.016

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Short summary

We quantify the impact of optically significant water constituents on surface heating rates and thermal energy fluxes in the western Baltic Sea. During productive months in 2018 (April to September) we found that the combined effect of coloured dissolved organic matter and particulate absorption contributes to sea surface heating of between 0.4 and 0.9 K m⁻¹ d⁻¹ and a mean loss of heat (ca. 5 W m⁻²) from the sea to the atmosphere. This may be important for regional heat balance budgets.