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| Titel |
Biogeochemistry of the Kem' River estuary, White Sea (Russia) |
| VerfasserIn |
V. R. Shevchenko, Y. S. Dolotov, N. N. Filatov, T. N. Alexeeva, A. S. Filippov, E.-M. Nöthig, A. N. Novigatsky, L. A. Pautova, A. V. Platonov, N. V. Politova, T. N. Rat'kova, R. Stein |
| 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 ; 9, no. 1/2 ; Nr. 9, no. 1/2 (2005-06-14), S.57-66 |
| Datensatznummer |
250006589
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| Publikation (Nr.) |
 copernicus.org/hess-9-57-2005.pdf |
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| Zusammenfassung |
| The biogeochemistry of the river-sea interface was studied in the Kem' River
(the largest river flowing to the White Sea from Karelian coast) estuary and
adjacent area of the White Sea onboard the RV "Ekolog" in summer 2001,
2002 and 2003. The study area can be divided into 3 zones: I - the estuary
itself, with water depth from 1 to 5m and low salinity in the surface layer
(salinity is lower than 0.2psu in the Kem' River and varies from 15 to 20psu
in outer part of this zone); II - the intermediate zone with depths
from 5 to 10m and salinity at the surface from 16 to 22psu; III - the
marine zone with depths from 10 to 29 m and salinity 21-24.5psu. Highest
concentrations of the suspended particulate matter (SPM) were registered in
the Kem' mouth (5-7mg/l). They sharply decreased to values <1mg/l
towards the sea. At beginning of July 2001, particulate organic carbon (POC)
concentration in the river mouth was 404µg/l and POC content in total
SPM was 5.64%. In the marine part of the studied area the POC
concentration varied from 132 to 274µg/l and the POC contents in
suspended matter increased to 19-52.6%. These studies show, that the
majority of riverborne suspended matter in the Kem' estuary deposits near
the river mouth within the 20psu isohaline, where sedimentation of the
suspended matter takes place. The role of fresh-water phytoplankton species
decreases and the role of marine species increases from the river to sea and
the percentage of green algae decreases and the role of diatoms increases.
The organic carbon (Corg) to nitrogen (N) ratio (Corg/N) in
both suspended matter and bottom sediments decreases from the river to the
marine part of the mixing zone (from 8.5 to 6.1 in the suspended matter and
from 14.6 to 7.5 in the bottom sediments), demonstrating that content of
terrestrial-derived organic matter decreases and content of marine organic
matter increases from the river mouth to the sea. The Kem' estuary exhibits
a similar character of biogeochemial processes as in the large Arctic
estuaries, but the scale of these processes (amount of river input of SPM,
POC, area of estuaries) is different. |
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