Heat loss from the Atlantic water layer in the northern Kara Sea: causes and consequencesстатья
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Дата последнего поиска статьи во внешних источниках: 7 ноября 2016 г.
Аннотация: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)Wm−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.