DOC and POC in the water column of the southern Baltic. Part I. Evaluation of factors influencing sources, distribution and concentration dynamics of organic matter
The aim of the study was to address questions regarding the vertical, horizontal and seasonal dynamics of both DOC and POC in the Baltic Sea and the factors influencing carbon concentrations. In general, the highest concentrations of both DOC and POC were recorded in the surface water layer (DOC ~4...
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| Format: | Article |
| Language: | English |
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Elsevier
2014-06-01
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| Series: | Oceanologia |
| Subjects: | |
| Online Access: | http://www.iopan.gda.pl/oceanologia/56_3.html#A6 |
| _version_ | 1811246270070652928 |
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| author | Anna Maciejewska Janusz Pempkowiak |
| author_facet | Anna Maciejewska Janusz Pempkowiak |
| author_sort | Anna Maciejewska |
| collection | DOAJ |
| description | The aim of the study was to address questions regarding the vertical, horizontal and seasonal dynamics of both DOC and POC in the Baltic Sea and the factors influencing carbon concentrations. In general, the highest concentrations of both DOC and POC were recorded in the surface water layer (DOC ~4.7 mg dm<sup>-3</sup>, POC ~0.6 mg dm<sup>-3</sup>) as a consequence of intensive phytoplankton activity, and in the halocline layer (DOC ~5.1 mg dm<sup>-3</sup>, POC ~0.4 mg dm<sup>-3</sup>). The lowest DOC and POC concentrations were measured in the sub-halocline water layer, where the values did not exceed 3.5 mg dm<sup>-3</sup> (DOC) and 0.1 mg dm<sup>-3</sup> (POC). Seasonally, the highest DOC and POC concentrations were measured during the growing season: surface DOC ~5.0 mg dm<sup>-3</sup>; sub-halocline DOC ~4.1 mg dm<sup>-3</sup> and surface POC ~0.9 mg dm<sup>-3</sup>, sub-halocline POC ~0.2 mg dm<sup>-3</sup>. The ANOVA Kruskal-Wallis test results indicate statistically significant differences among the three study sites regarding average concentrations, and concentrations in particular water layers and seasons. It shows that concentrations of DOC and POC differ in sub-basins of the Baltic Sea. The differences were attributed to the varying distances from river mouths to study sites or the different starting times and/or durations of the spring algal blooms. Statistically significant dependences were found between both DOC and POC concentrations and Chl <i>a</i> (phytoplankton biomass), pH (phytoplankton photosynthetic rate), pheo (zooplankton sloppy feeding), salinity (river run-off and North Sea water inflows) and water temperature (season). This was taken as proof that these factors influence DOC and POC in the study areas. |
| first_indexed | 2024-04-12T14:51:01Z |
| format | Article |
| id | doaj.art-c387dcf5a3ce409287668fe0d3e8e02a |
| institution | Directory Open Access Journal |
| issn | 0078-3234 |
| language | English |
| last_indexed | 2024-04-12T14:51:01Z |
| publishDate | 2014-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Oceanologia |
| spelling | doaj.art-c387dcf5a3ce409287668fe0d3e8e02a2022-12-22T03:28:28ZengElsevierOceanologia0078-32342014-06-0156352354810.5697/oc.56-3.523 DOC and POC in the water column of the southern Baltic. Part I. Evaluation of factors influencing sources, distribution and concentration dynamics of organic matterAnna Maciejewska0Janusz Pempkowiak1Institute of Oceanology, Polish Academy of Sciences, Powstańców Warszawy 55, 81-712 Sopot, Poland; Institute of Oceanology, Polish Academy of Sciences, Powstańców Warszawy 55, 81-712 Sopot, Poland; The aim of the study was to address questions regarding the vertical, horizontal and seasonal dynamics of both DOC and POC in the Baltic Sea and the factors influencing carbon concentrations. In general, the highest concentrations of both DOC and POC were recorded in the surface water layer (DOC ~4.7 mg dm<sup>-3</sup>, POC ~0.6 mg dm<sup>-3</sup>) as a consequence of intensive phytoplankton activity, and in the halocline layer (DOC ~5.1 mg dm<sup>-3</sup>, POC ~0.4 mg dm<sup>-3</sup>). The lowest DOC and POC concentrations were measured in the sub-halocline water layer, where the values did not exceed 3.5 mg dm<sup>-3</sup> (DOC) and 0.1 mg dm<sup>-3</sup> (POC). Seasonally, the highest DOC and POC concentrations were measured during the growing season: surface DOC ~5.0 mg dm<sup>-3</sup>; sub-halocline DOC ~4.1 mg dm<sup>-3</sup> and surface POC ~0.9 mg dm<sup>-3</sup>, sub-halocline POC ~0.2 mg dm<sup>-3</sup>. The ANOVA Kruskal-Wallis test results indicate statistically significant differences among the three study sites regarding average concentrations, and concentrations in particular water layers and seasons. It shows that concentrations of DOC and POC differ in sub-basins of the Baltic Sea. The differences were attributed to the varying distances from river mouths to study sites or the different starting times and/or durations of the spring algal blooms. Statistically significant dependences were found between both DOC and POC concentrations and Chl <i>a</i> (phytoplankton biomass), pH (phytoplankton photosynthetic rate), pheo (zooplankton sloppy feeding), salinity (river run-off and North Sea water inflows) and water temperature (season). This was taken as proof that these factors influence DOC and POC in the study areas.http://www.iopan.gda.pl/oceanologia/56_3.html#A6Deeps: BornholmGdańskGotland; ranges: seasonalvertical; sources and sinks: primary productionbacterial decompositionzooplanktonriver run-offinflows from North Sea |
| spellingShingle | Anna Maciejewska Janusz Pempkowiak DOC and POC in the water column of the southern Baltic. Part I. Evaluation of factors influencing sources, distribution and concentration dynamics of organic matter Oceanologia Deeps: Bornholm Gdańsk Gotland; ranges: seasonal vertical; sources and sinks: primary production bacterial decomposition zooplankton river run-off inflows from North Sea |
| title | DOC and POC in the water column of the southern Baltic. Part I. Evaluation of factors influencing sources, distribution and concentration dynamics of organic matter |
| title_full | DOC and POC in the water column of the southern Baltic. Part I. Evaluation of factors influencing sources, distribution and concentration dynamics of organic matter |
| title_fullStr | DOC and POC in the water column of the southern Baltic. Part I. Evaluation of factors influencing sources, distribution and concentration dynamics of organic matter |
| title_full_unstemmed | DOC and POC in the water column of the southern Baltic. Part I. Evaluation of factors influencing sources, distribution and concentration dynamics of organic matter |
| title_short | DOC and POC in the water column of the southern Baltic. Part I. Evaluation of factors influencing sources, distribution and concentration dynamics of organic matter |
| title_sort | doc and poc in the water column of the southern baltic part i evaluation of factors influencing sources distribution and concentration dynamics of organic matter |
| topic | Deeps: Bornholm Gdańsk Gotland; ranges: seasonal vertical; sources and sinks: primary production bacterial decomposition zooplankton river run-off inflows from North Sea |
| url | http://www.iopan.gda.pl/oceanologia/56_3.html#A6 |
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