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| Titel |
Interannual variability of surface and bottom sediment transport on the Laptev Sea shelf during summer |
| VerfasserIn |
C. Wegner, D. Bauch, J. A. Hölemann, M. A. Janout, B. Heim, A. Novikhin, H. Kassens, L. Timokhov |
| 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 ; 10, no. 2 ; Nr. 10, no. 2 (2013-02-20), S.1117-1129 |
| Datensatznummer |
250017522
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| Publikation (Nr.) |
 copernicus.org/bg-10-1117-2013.pdf |
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| Zusammenfassung |
Sediment transport dynamics were studied during ice-free conditions under
different atmospheric circulation regimes on the Laptev Sea shelf (Siberian
Arctic). To study the interannual variability of suspended particulate
matter (SPM) dynamics and their coupling with the variability in surface
river water distribution on the Laptev Sea shelf, detailed oceanographic, optical
(turbidity and Ocean Color satellite data), and hydrochemical (nutrients,
SPM, stable oxygen isotopes) process studies were carried out continuously
during the summers of 2007 and 2008. Thus, for the first time SPM and
nutrient variations on the Laptev Sea shelf under different atmospheric
forcing and the implications for the turbidity and transparency of the water
column can be presented.
The data indicate a clear link between different surface distributions of
riverine waters and the SPM transport dynamics within the entire water
column. The summer of 2007 was dominated by shoreward winds and an eastward
transport of riverine surface waters. The surface SPM concentration on the
southeastern inner shelf was elevated, which led to decreased
transmissivity and increased light absorption. Surface SPM concentrations in
the central and northern Laptev Sea were comparatively low. However, the SPM
transport and concentration within the bottom nepheloid layer increased
considerably on the entire eastern shelf. The summer of 2008 was dominated
by offshore winds and northward transport of the river plume. The surface
SPM transport was enhanced and extended onto the mid-shelf, whereas the
bottom SPM transport and concentration was diminished. This study suggests
that the SPM concentration and transport, in both the surface and bottom
nepheloid layers, are associated with the distribution of riverine surface
waters which are linked to the atmospheric circulation patterns over the
Laptev Sea and the adjacent Arctic Ocean during the open water season. A
continuing trend toward shoreward winds, weaker stratification and higher
SPM concentration throughout the water column might have severe consequences
for the ecosystem on the Laptev Sea shelf. |
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