Wspólnotowy Serwis Informacyjny Badan i Rozwoju - CORDIS

Chlorophyll-a mapping in the Gulf of Gdansk

The part of the Gulf of Gdansk located close to the mouth of the Vistula was chosen as a test area for field experiments carried out in 2002-2003 within the OROMA project. The main goal of these experiments was to collect chlorophyll-a in-situ data for comparison with data derived from satellite instruments.

On all cruises, the chlorophyll-a concentration was determined at fixed points using the spectrophotometric method. Parallel profiles of chlorophyll-a using the fluorometric method were performed during three cruises in 2002 and three cruises in 2003. This method was chosen in order to provide continuous profiles of the parameter and to enable mapping of chlorophyll a horizontal distribution.

The samples were taken every one minute along the profiles using a flow-through fluorometer at a depth of 2.5 m. At the same time, water samples for spectrophometric determination of chlorophyll-a were taken at selected stations at depths 0, 2.5, 5, 10m. Then, all fluorometric data were calibrated and corrected using linear regression against spectrophometric measurements of samples from 2.5m depth. During four cruises, measurements of the vertical distribution of suspended particulate matter (SPM) were also carried out.

Fifteen MODIS images were reviewed for match-up comparisons with field measurements from cruises performed in 2002-2003. Only four of them, all from 2003, were selected for the further analysis due to either quality or cloud cover. No suitable MODIS data were found for the time of the experiments in 2002.

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Institute of Meteorology and Water Management. Maritime Branch
Waszyngtona 42
81-342 Gdynia
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