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| Titel |
Tracing inputs of terrestrial high molecular weight dissolved organic matter within the Baltic Sea ecosystem |
| VerfasserIn |
B. Deutsch, V. Alling, C. Humborg, F. Korth, C. M. Mörth |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 9, no. 11 ; Nr. 9, no. 11 (2012-11-13), S.4465-4475 |
| Datensatznummer |
250007389
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| Publikation (Nr.) |
 copernicus.org/bg-9-4465-2012.pdf |
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| Zusammenfassung |
| To test the hypothesis whether high molecular weight dissolved organic
matter (HMW-DOM) in a high latitude marginal sea is dominated by terrestrial
derived matter, 10 stations were sampled along the salinity gradient of the
central and northern Baltic Sea and were analyzed for concentrations of
dissolved organic carbon as well as δ13C values of HMW-DOM.
Different end-member-mixing models were applied to quantify the influence of
terrestrial DOM and to test for conservative versus non-conservative
behavior of the terrestrial DOM in the different Baltic
Sea basins. The share of terrestrial DOM to the total HMW-DOM was calculated
for each station, ranging from 43 to 83%. This shows the high influence
of terrestrial DOM inputs for the Baltic Sea ecosystem. The data also
suggest that terrestrial DOM reaching the open Baltic Sea is not subject to
substantial removal anymore. However compared to riverine DOM concentrations,
our results indicate that substantial amounts of HMW-DOM (> 50%) seem
to be removed near the coastline during estuarine mixing. A budget approach
yielded residence times for terrestrial DOM of 2.8, 3.0, and 4.5 yr for
the Bothnian Bay, the Bothnian Sea and the Baltic Proper. |
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