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1

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

100%
Krezel A., Kozlowski L.
Oceanological Studies
|
2001
|
vol. 30
|
issue 3-4
17-38
EN
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%.
2

The modification of light flux leaving a wind-roughened, oil covered sea surface: example of computations for hallow seas

100%
Otremba Z., Piskozub P. J., Piskozub J.
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2000
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vol. 29
|
issue 1
117-133
EN
This paper presents chosen results of modelling of upward light flux over a rough sea surface covered with an oil film. In upward irradiance computations (by means of Monte Carlo method), the optical parameters of two types of water were taken into consideration: water typical for bays of the Baltic Sea (Case 2 water) and ocean (Case 1) waters, both covered with an oil layer 5 mum thick (Romashkino). Coefficients of reflectance and transmission for the oil film were used for the calculations. These coefficients were obtained through the mathematical simulation of the route of light rays, both upward and downward, through the oil film. The obtained results show that oil films influence upward light fluxes over the sea surface, and that this influence depends on the depth and roughness of the sea. The analyses of oil film visibility on sea surfaces revealed also the influence of the direction of observation.
3

The use of sequential satellite images for the calculating surface velocity vectors in the waters of the Gulf of Gdansk

100%
Zarki I., Krezel A., Zarki I. K. A.
Oceanological Studies
|
1999
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vol. 28
|
issue 3-4
35-44
EN
The Maximum Cross Correlation method (MCC) modified with divergence checking was used to calculate the surface velocity field in the Gulf of Gdansk. The brightness temperature in channel 4 of the AVHRR taken 10 times between 6 and 9 August 1996 served as input data. The surface velocity vector distribution obtained with the use of MCC are compared with the results of a 3D hydrodynamic model and field observation of a drifting rhodamine spill during the POLRODEX?96 experiment
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