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Дата последнего поиска статьи во внешних источниках: 27 ноября 2016 г.
Аннотация:We present high resolution simulations and observational data as evidence of a fast
current flowing along the shelf break of the Siberian and Alaskan shelves in the Arctic
Ocean. Thus far, the Arctic Circumpolar Boundary Current (ACBC) has been seen as
comprising two branches: the Fram Strait and Barents Sea Branches (FSB and BSB,
respectively). Here we describe a new third branch, the Arctic Shelf Break Branch
(ASBB). We show that the forcing mechanism for the ASBB is a combination of
buoyancy loss and non local wind, creating high pressure upstream in the Barents Sea.
The potential vorticity influx through the St. Anna Trough dictates the cyclonic direction
of flow of the ASBB, which is the most energetic large scale circulation structure in
the Arctic Ocean. It plays a substantial role in transporting Arctic halocline waters and
exhibits a robust seasonal cycle with a summer minimum and winter maximum. The
simulations show the continuity of the FSB all the way around the Arctic shelves and the
uninterrupted ASBB between the St. Anna Trough and the western Fram Strait. The BSB
flows continuously along the Siberian shelf as far as the Chukchi Plateau, where it partly
diverges from the continental slope into the ocean interior. The Alaskan Shelf break
Current (ASC) is the analog of the ASBB in the Canadian Arctic. The ASC is forced by
the local winds and high upstream pressure in Bering Strait, caused by the drop in sea
surface height between the Pacific and Arctic Oceans.