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1

AVHRR images as a tool in the analysis of marine suspended matter in polar regions

100%
Krezel A.
|
|
vol. 26
|
issue 2-3
21-30
EN
The vector analysis technique developed by Stumpf (1987) was used in calculations of the suspended matter concentra-tion field in west Spitsbergen surface waters. The reflectance of the sea surface in AVHRR channels 1 and 2 was taken as input data. As a result of satellite data processing, four near-noon instantaneous distributions of suspended matter in the second half of July 1993 were obtained.
2

A model of solar energy input to the sea surface

100%
Krezel A.
|
|
vol. 26
|
issue 4
21-34
EN
On the basis of the papers of Bird and Riordan (1986), Justus and Paris (1985), Kr??el (1985, 1997) and Leckner (1978), a model of solar radiation energy input to the sea surface under real meteorological conditions has been developed. The model enables one to determine the flux or dose of total (direct + scattered) radiation within the whole visible light spectrum and any other spectrum interval in the range of 300-4000 nm. The initial data to the model are: atmospheric pressure and water vapour pressure at the sea surface and cloudiness. The seasonal mean long-term values of ozone and aerosol caused attenuation of light in the southern Baltic area were taken into account. The calculations performed for Gdynia and Hel regions are in a good agreement with the ac-tinometric data recorded in Gdynia. Therefore, the presented model could serve as a part of eco-logical model.
3

Chlorophyll a content in the surface layer of the Gulf of Gdansk in the AVHRR images

64%
Krezel A., Latala A.
Oceanological Studies
|
1999
|
vol. 28
|
issue 3-4
3-15
EN
The satellite data in red and near infrared light (1st and 2nd channels of AVHRR) were processed and compared with chlorophyll a concentration in the surface layer of the Gulf of Gdansk. Taking into account Stumpf and Tyler (1988) proposal, quantitative relation between this concentration and the value of Cij=R2/R1 (where R2 and R1 denotes reflectance coefficients in AVHRR's channel 1 and 2 respectively) has been calculated.
4

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

64%
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%.
5

Influence of the Vistula river on suspended matter content in the Gulf of Gdansk waters

63%
Krezel A., Cyberski J.
Oceanological Studies
|
1993
|
issue 64/3
27-39
6

Chlorophyll vs AVHRR satelite data during Skagex Experiment

51%
Darecki M., Kowalczuk P., Sagan S., Krezel A.
|
7

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

51%
Zarki I., Krezel A., Zarki I. K. A.
Oceanological Studies
|
1999
|
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
8

Long-term trends of concentration of nitrates, phosphates and oxygen in the Gulf of Gdansk

51%
Nowacki J., Kowalewski M., Krezel A.
Oceanological Studies
|
1993
|
issue 64/3
123-130
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