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2 Oceanologia

2 2013

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Influence of the parametrization of water optical properties on the modelled sea surface temperature in the Baltic Sea

Stramska M., Zuzewicz A.

Oceanologia

2013

No. 55 (1)

53-76

Treatment of light propagation in the water column requires further improvements in the biogeochemical models of the Baltic Sea. Regional models of the Baltic Sea usually assume a simple exponential vertical distribution of the total downward irradiance in the visible spectral range (PAR, photosynthetically available radiation). This is in spite of the fact that modelling studies for open ocean regions have stressed the importance of more detailed optical parameterization for the quality prediction of sea surface temperature and thermal structure of surface waters. In recent years extensive regional in situ bio-optical data sets have become available for the Baltic Sea, which can be used to develop a better understanding of the feedbacks between optics and other processes simulated by the models. In this paper we compare four optical parameterizations used in numerical ocean models and their effects on modelled SSTs. This has been achieved using a one-dimensional ocean model coupled with the bio-optical models. Our results indicate that the differences between the various modelled SSTs using three optical parameterization schemes designed specifically for the Baltic Sea can give differences of up to 4°C in the modelled SSTs. This result warrants further research into the subject.

Comparison of primary productivity estimates in the Baltic Sea based on the DESAMBEM algorithm with estimates based on other similar algorithms

Stramska M., Zuzewicz A.

Oceanologia

2013

No. 55 (1)

77-100

The quasi-synoptic view available from satellites has been broadly used in recent years to observe in near-real time the large-scale dynamics of marine ecosystems and to estimate primary productivity in the world ocean. However, the standard global NASA ocean colour algorithms generally do not produce good results in the Baltic Sea. In this paper, we compare the ability of seven algorithms to estimate depth-integrated daily primary production (PP, mg C m-2) in the Baltic Sea. All the algorithms use surface chlorophyll concentration, sea surface temperature, photosynthetic available radiation, latitude, longitude and day of the year as input data. Algorithm-derived PP is then compared with PP estimates obtained from 14C uptake measurements. The results indicate that the best agreement between the modelled and measured PP in the Baltic Sea is obtained with the DESAMBEM algorithm. This result supports the notion that a regional approach should be used in the interpretation of ocean colour satellite data in the Baltic Sea.