Monitoring the effect of upwelling on the chlorophyll <i>a</i> distribution in the Gulf of Finland (Baltic Sea) using remote sensing and in situ data
The spatio-temporal variability of chlorophyl <i>a</i> (Chl <i>a</i>) caused by a sequence of upwelling events in the Gulf of Finland in July-August 2006 was studied using remote sensing data and field measurements. Spatial distributions of sea surface temperature (SST) and C...
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Institute of Oceanology of the Polish Academy of Sciences
2012-06-01
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| Series: | Oceanologia |
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| Online Access: | http://www.iopan.gda.pl/oceanologia/54_3.html#A4 |
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| author | Laura Raag Liis Sipelgas Jaan Laanemets Rivo Uiboupin Inga Lips |
| author_facet | Laura Raag Liis Sipelgas Jaan Laanemets Rivo Uiboupin Inga Lips |
| author_sort | Laura Raag |
| collection | DOAJ |
| description | The spatio-temporal variability of chlorophyl <i>a</i> (Chl <i>a</i>) caused by a sequence of upwelling events in the Gulf of Finland in July-August 2006 was studied using remote sensing data and field measurements. Spatial distributions of sea surface temperature (SST) and Chl <i>a</i> concentration were examined using MODIS and MERIS data respectively. The MERIS data were processed with an algorithm developed by the Free University of Berlin (FUB) for case 2 waters. Evaluation of MERIS Chl <i>a</i> versus in situ Chl <i>a</i> showed good correlation (r<sup>2</sup> = 0.67), but the concentration was underestimated. The linear regression for a 2 h window was applied to calibrate MERIS Chl <i>a</i>. The spatio-temporal variability exhibited the clear influence of upwelling events and related filaments on Chl <i>a</i> distribution in the western and central Gulf. The lowest Chl <i>a</i> concentrations were recorded in the upwelled water, especially at the upwelling centres, and the highest concentrations (13 mg m<sup>-3</sup>) were observed about two weeks after the upwelling peak along the northern coast. The areas along the northern coast of upwelled water (4879 km<sup>2</sup>) on the SST map, and increased Chl <i>a</i> (5526 km<sup>2</sup>) two weeks later, were roughly coincident. The effect of upwelling events was weak in the eastern part of the Gulf, where Chl <i>a</i> concentration was relatively consistent throughout this period. |
| format | Article |
| id | doaj-art-bbae2dfadeef4c0babf012862be97e3c |
| institution | Kabale University |
| issn | 0078-3234 |
| language | English |
| publishDate | 2012-06-01 |
| publisher | Institute of Oceanology of the Polish Academy of Sciences |
| record_format | Article |
| series | Oceanologia |
| spelling | doaj-art-bbae2dfadeef4c0babf012862be97e3c2025-08-20T03:48:28ZengInstitute of Oceanology of the Polish Academy of SciencesOceanologia0078-32342012-06-01543395419Monitoring the effect of upwelling on the chlorophyll <i>a</i> distribution in the Gulf of Finland (Baltic Sea) using remote sensing and in situ dataLaura RaagLiis SipelgasJaan LaanemetsRivo UiboupinInga LipsThe spatio-temporal variability of chlorophyl <i>a</i> (Chl <i>a</i>) caused by a sequence of upwelling events in the Gulf of Finland in July-August 2006 was studied using remote sensing data and field measurements. Spatial distributions of sea surface temperature (SST) and Chl <i>a</i> concentration were examined using MODIS and MERIS data respectively. The MERIS data were processed with an algorithm developed by the Free University of Berlin (FUB) for case 2 waters. Evaluation of MERIS Chl <i>a</i> versus in situ Chl <i>a</i> showed good correlation (r<sup>2</sup> = 0.67), but the concentration was underestimated. The linear regression for a 2 h window was applied to calibrate MERIS Chl <i>a</i>. The spatio-temporal variability exhibited the clear influence of upwelling events and related filaments on Chl <i>a</i> distribution in the western and central Gulf. The lowest Chl <i>a</i> concentrations were recorded in the upwelled water, especially at the upwelling centres, and the highest concentrations (13 mg m<sup>-3</sup>) were observed about two weeks after the upwelling peak along the northern coast. The areas along the northern coast of upwelled water (4879 km<sup>2</sup>) on the SST map, and increased Chl <i>a</i> (5526 km<sup>2</sup>) two weeks later, were roughly coincident. The effect of upwelling events was weak in the eastern part of the Gulf, where Chl <i>a</i> concentration was relatively consistent throughout this period.http://www.iopan.gda.pl/oceanologia/54_3.html#A4MERISMODISUpwellingChlorophyll <sup>a</sup>SSTBaltic SeaGulf of Finland |
| spellingShingle | Laura Raag Liis Sipelgas Jaan Laanemets Rivo Uiboupin Inga Lips Monitoring the effect of upwelling on the chlorophyll <i>a</i> distribution in the Gulf of Finland (Baltic Sea) using remote sensing and in situ data Oceanologia MERIS MODIS Upwelling Chlorophyll <sup>a</sup> SST Baltic Sea Gulf of Finland |
| title | Monitoring the effect of upwelling on the chlorophyll <i>a</i> distribution in the Gulf of Finland (Baltic Sea) using remote sensing and in situ data |
| title_full | Monitoring the effect of upwelling on the chlorophyll <i>a</i> distribution in the Gulf of Finland (Baltic Sea) using remote sensing and in situ data |
| title_fullStr | Monitoring the effect of upwelling on the chlorophyll <i>a</i> distribution in the Gulf of Finland (Baltic Sea) using remote sensing and in situ data |
| title_full_unstemmed | Monitoring the effect of upwelling on the chlorophyll <i>a</i> distribution in the Gulf of Finland (Baltic Sea) using remote sensing and in situ data |
| title_short | Monitoring the effect of upwelling on the chlorophyll <i>a</i> distribution in the Gulf of Finland (Baltic Sea) using remote sensing and in situ data |
| title_sort | monitoring the effect of upwelling on the chlorophyll i a i distribution in the gulf of finland baltic sea using remote sensing and in situ data |
| topic | MERIS MODIS Upwelling Chlorophyll <sup>a</sup> SST Baltic Sea Gulf of Finland |
| url | http://www.iopan.gda.pl/oceanologia/54_3.html#A4 |
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