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| Titel |
Riverine transport of biogenic elements to the Baltic Sea – past and possible future perspectives |
| VerfasserIn |
C. Humborg, C.-M. Mörth, M. Sundbom, F. Wulff |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 11, no. 5 ; Nr. 11, no. 5 (2007-09-26), S.1593-1607 |
| Datensatznummer |
250009470
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| Publikation (Nr.) |
 copernicus.org/hess-11-1593-2007.pdf |
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| Zusammenfassung |
| The paper reviews critical processes for the land-sea fluxes of biogenic
elements (C, N, P, Si) in the Baltic Sea catchment and discusses possible
future scenarios as a consequence of improved sewage treatment, agricultural
practices and increased hydropower demand (for N, P and Si) and of global
warming, i.e., changes in hydrological patterns (for C). These most
significant drivers will not only change the total amount of nutrient inputs
and fluxes of organic and inorganic forms of carbon to the Baltic Sea, their
ratio (C:N:P:Si) will alter as well with consequences for phytoplankton
species composition in the Baltic Sea. In summary, we propose that N fluxes
may increase due to higher livestock densities in those countries recently
acceded to the EU, whereas P and Si fluxes may decrease due to an improved
sewage treatment in these new EU member states and with further damming and
still eutrophic states of many lakes in the entire Baltic Sea catchment.
This might eventually decrease cyanobacteria blooms in the Baltic but
increase the potential for other nuisance blooms. Dinoflagellates could
eventually substitute diatoms that even today grow below their optimal
growth conditions due to low Si concentrations in some regions of the Baltic
Sea. C fluxes will probably increase from the boreal part of the Baltic Sea
catchment due to the expected higher temperatures and heavier rainfall.
However, it is not clear whether dissolved organic carbon and alkalinity,
which have opposite feedbacks to global warming, will increase in similar
amounts, because the spring flow peak will be smoothed out in time due to
higher temperatures that cause less snow cover and deeper soil infiltration. |
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