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Verification of the model of a solar energy radiation input to the sea surface against actinometric data

Krężel A., Kozłowski Ł.

Oceanological Studies

2001

Vol. 30, No. 3-4

17-38

Data on the planetary albedo which were registered in Channel 0.4 - 1.1 mum (VIS) by the geostationary satellite METEOSAT were used to determine a quantitative characteristic of a cloud cover over the Baltic Sea area. By applying the obtained results and the input data generated by the model of the Interdisciplinary Centre for Mathematical and Computational Modelling of the Warsaw University, calculations of irradiance on the sea surface were done using the model of radiation transmission in the Baltic Sea atmosphere. The results were compared to the actinometric data that were continuously recorded by the Gdansk Maritime Institute's measuring buoy that was anchored at 18°31.094'E and 54°56.157'N. It was noted that the application of ICM model information on the atmosphere to the solar radiation transmission model results in decreasing the calculated irradiance values by approximately 15% in relation to the measured values. If cloud cover data in the input data set are replaced by relevant satellite data, then the average difference between the measured data and the modelled ones decreases to approximately 5%.

Radiation flux balance of the sea-atmosphere system over the southern Baltic Sea

Kaczmarek S., Dera J.

Oceanologia

1998

No. 40 (3)

277-306

Developed at IO PAS, Sopot, and first presented at the BALTEX Study Conference in Visby (Dera et al., 1995), the improved radiation transfer model was applied to determine the following radiation fluxes in the southern Baltic region: the flux entering the Earth's atmosphere Q1, the sum of fluxes absorbed Q2 and scattered upwards (reflected) in the atmosphere Q2´ , the direct solar ray flux reaching the sea surface Q3, the diffuse solar flux (scattered downwards in the atmosphere) reaching the sea surface Q4, the total solar flux reaching the sea surface Q5, the total flux reflected by the sea surface Q6, the total flux entering the water column Q7, the flux scattered upwards by the water body and leaving the sea surface Q8, the flux absorbed in the water column Q9, that absorbed by the water itself Q10, that absorbed by admixtures other than phytoplankton pigments Q11, and that absorbed by phytoplankton pigments Q12, the photosynthetically stored radiation flux Q13 and the effective infrared radiation flux at the sea surface Q14. The model has been developed for the application of satellite images as the main source of input data. However, since the relevant satellite data are not yet available, a long-term meteorological and bio-optical standard database has been used in the computations. The mean monthly fluxes and their balances for the southern Baltic region, divided into 20 sub-regions, have been obtained for each month of the year.