Variability of the thermohaline structure and transport of Atlantic water in the Arctic Ocean based on NABOS (Nansen and Amundsen Basins Observing System) hydrography data
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Published:2020-04-02
Issue:2
Volume:16
Page:405-421
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ISSN:1812-0792
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Container-title:Ocean Science
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language:en
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Short-container-title:Ocean Sci.
Author:
Zhurbas Nataliya,Kuzmina Natalia
Abstract
Abstract. Conductivity–temperature–depth (CTD) transects across continental
slope of the Eurasian Basin and the St. Anna Trough performed during
NABOS (Nansen and Amundsen Basins Observing System) project in
2002–2015 and a transect from the 1996 Polarstern expedition are
used to describe the temperature and salinity characteristics and
volume flow rates (volume transports) of the current carrying the
Atlantic water (AW) in the Arctic Ocean. The variability of the AW
on its pathway along the slope of the Eurasian Basin is
investigated. A dynamic Fram Strait branch of the Atlantic water
(FSBW) is identified in all transects, including two transects in
the Makarov Basin (along 159∘ E), while the cold waters on
the eastern transects along 126, 142, and
159∘ E, which can be associated with the influence of the
Barents Sea branch of the Atlantic water (BSBW), were observed in
the depth range below 800 m and had a negligible effect on
the spatial structure of isopycnic surfaces. The geostrophic volume
transport of AW decreases farther away from the areas of the AW
inflow to the Eurasian Basin, decreasing by 1 order of magnitude
in the Makarov Basin at 159∘ E, implying that the major
part of the AW entering the Arctic Ocean circulates cyclonically
within the Nansen and Amundsen basins. There is an absolute maximum
of θmax (AW core temperature) in 2006–2008 time
series and a maximum in 2013, but only at 103∘ E. Salinity
S(θmax) (AW core salinity) time series display
a trend of an increase in AW salinity over time, which can be referred
to as an AW salinization in the early 2000s. The maxima of θmax and S(θmax) in 2006 and 2013 are
accompanied by the volume transport maxima. The time average
geostrophic volume transports of AW are 0.5 Sv in the
longitude range 31–92∘ E, 0.8 Sv in the St. Anna
Trough, and 1.1 Sv in the longitude range
94–107∘ E.
Funder
Russian Science Foundation
Publisher
Copernicus GmbH
Subject
Cell Biology,Developmental Biology,Embryology,Anatomy
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