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| Titel |
Heat loss from the Atlantic water layer in the northern Kara Sea: causes and consequences |
| VerfasserIn |
I. A. Dmitrenko, S. A. Kirillov, N. Serra, N. V. Koldunov, V. V. Ivanov, U. Schauer, I. V. Polyakov, D. Barber, M. Janout, V. S. Lien, M. Makhotin, Y. Aksenov |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 10, no. 4 ; Nr. 10, no. 4 (2014-08-15), S.719-730 |
| Datensatznummer |
250117044
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| Publikation (Nr.) |
 copernicus.org/os-10-719-2014.pdf |
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| Zusammenfassung |
| A distinct, subsurface density front along the eastern St. Anna Trough in the
northern Kara Sea is inferred from hydrographic observations in 1996 and
2008–2010. Direct velocity measurements show a persistent northward
subsurface current (~ 18 cm s−1) along the St. Anna Trough
eastern flank. This sheared flow, carrying the outflow from the Barents and
Kara seas to the Arctic Ocean, is also evident from shipboard observations as
well as from geostrophic velocities and numerical model simulations. Although
we cannot substantiate our conclusions by direct observation-based estimates
of mixing rates in the area, we hypothesize that the enhanced vertical mixing
along the St. Anna Trough eastern flank favors the upward heat loss from the
intermediate warm Atlantic water layer. Modeling results support this
hypothesis. The upward heat flux inferred from hydrographic data and model
simulations is of O(30–100) W m−2. The region of lowered sea ice
thickness and concentration seen both in sea ice remote sensing observations
and model simulations marks the Atlantic water pathway in the St. Anna Trough
and adjacent Nansen Basin continental margin. In fact, the sea ice shows a
delayed freeze-up onset during fall and a reduction in the sea ice thickness
during winter. This is consistent with our results on the enhanced Atlantic
water heat loss along the Atlantic water pathway in the St. Anna Trough. |
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