Preprints
https://doi.org/10.5194/gmd-2020-318
https://doi.org/10.5194/gmd-2020-318

Submitted as: development and technical paper 04 Dec 2020

Submitted as: development and technical paper | 04 Dec 2020

Review status: this preprint is currently under review for the journal GMD.

Radiation model for the Baltic Sea with an explicit CDOM state variable: a case study with Model ERGOM (version 1.2)

Thomas Neumann1, Sampsa Koponen2, Jenni Attila2, Carsten Brockmann3, Kari Kallio2, Mikko Kervinen2, Constant Mazeran4, Dagmar Müller3, Petra Philipson5, Susanne Thulin5, Sakari Väkevä2, and Pasi Ylöstalo2 Thomas Neumann et al.
  • 1Leibniz Institute for Baltic Sea Research Warnemünde, Seestr. 15, 18119 Rostock, Germany
  • 2The Finnish Environment Institute, Latokartanonkaari 11, 00790 Helsinki, Finland
  • 3Brockmann Consult GmbH, Max-Planck-Str. 2, 21502 Geesthacht, Germany
  • 4SOLVO, 3 rue Saint-Antoine, 06600 Antibes, France
  • 5Brockmann Geomatics Sweden AB, Torshamnsgatan 39, SE-164 40 Kista, Sweden

Abstract. Colored dissolved organic matter (CDOM) in marine environments impacts primary production due to its absorption effect on the photosynthetically active radiation. In coastal seas, CDOM originates from terrestrial sources predominantly and causes spatial and temporal changing patterns of light absorption which should be considered in marine biogeochemical models. We propose a model approach in which Earth Observation (EO) products are used to define boundary conditions of CDOM concentrations in an ecosystem model of the Baltic Sea. CDOM concentrations in riverine water derived from EO products serve as forcing for the ecosystem model. For this reason, we introduced an explicit CDOM state variable in the model.

We show that the light absorption by CDOM in the model can be improved considerably compared to traditional approaches where, e.g., CDOM is estimated from salinity. A prerequisite is high quality CDOM data with sufficiently high spatial resolution which can be provided by the new generation of ESA satellite sensor systems (Sentinel 2 MSI and Sentinel 3 OLCI).

Thomas Neumann et al.

 
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Thomas Neumann et al.

Model code and software

Model code and boundary data for "Radiation model for the Baltic Sea with an explicit CDOM state variable: a case study with Model ERGOM (version 1.2)" paper. Thomas Neumann https://doi.org/10.5281/zenodo.4299873

Thomas Neumann et al.

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Short summary
The Baltic Sea is heavily impacted by surrounding land. Therefore, the concentration of colored dissolved organic matter (CDOM) of terrestrial origin is relatively high and impacts the light penetration depth. Estimating a correct light climate is essential for ecosystem models. In this study, a method is developed to derive riverine CDOM from earth observation methods. The data are used as boundary conditions for an ecosystem model and the advantage over former approaches is shown.