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

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...

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Published in:Ocean Science
Main Authors: Zhurbas, Nataliya, Kuzmina, Natalia
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2020
Subjects:
Online Access:https://doi.org/10.5194/os-16-405-2020
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spelling ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00051110 2023-05-15T14:58:09+02:00 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 Zhurbas, Nataliya Kuzmina, Natalia 2020-04 electronic https://doi.org/10.5194/os-16-405-2020 https://noa.gwlb.de/receive/cop_mods_00051110 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00050767/os-16-405-2020.pdf https://os.copernicus.org/articles/16/405/2020/os-16-405-2020.pdf eng eng Copernicus Publications Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792 https://doi.org/10.5194/os-16-405-2020 https://noa.gwlb.de/receive/cop_mods_00051110 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00050767/os-16-405-2020.pdf https://os.copernicus.org/articles/16/405/2020/os-16-405-2020.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2020 ftnonlinearchiv https://doi.org/10.5194/os-16-405-2020 2022-02-08T22:36:34Z 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. Article in Journal/Newspaper Arctic Arctic Ocean Barents Sea Fram Strait makarov basin Niedersächsisches Online-Archiv NOA Arctic Arctic Ocean Barents Sea Makarov Basin ENVELOPE(170.000,170.000,87.000,87.000) St. Anna Trough ENVELOPE(69.500,69.500,80.750,80.750) Ocean Science 16 2 405 421
institution Open Polar
collection Niedersächsisches Online-Archiv NOA
op_collection_id ftnonlinearchiv
language English
topic article
Verlagsveröffentlichung
spellingShingle article
Verlagsveröffentlichung
Zhurbas, Nataliya
Kuzmina, Natalia
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
topic_facet article
Verlagsveröffentlichung
description 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.
format Article in Journal/Newspaper
author Zhurbas, Nataliya
Kuzmina, Natalia
author_facet Zhurbas, Nataliya
Kuzmina, Natalia
author_sort Zhurbas, Nataliya
title 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
title_short 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
title_full 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
title_fullStr 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
title_full_unstemmed 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
title_sort 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
publisher Copernicus Publications
publishDate 2020
url https://doi.org/10.5194/os-16-405-2020
https://noa.gwlb.de/receive/cop_mods_00051110
https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00050767/os-16-405-2020.pdf
https://os.copernicus.org/articles/16/405/2020/os-16-405-2020.pdf
long_lat ENVELOPE(170.000,170.000,87.000,87.000)
ENVELOPE(69.500,69.500,80.750,80.750)
geographic Arctic
Arctic Ocean
Barents Sea
Makarov Basin
St. Anna Trough
geographic_facet Arctic
Arctic Ocean
Barents Sea
Makarov Basin
St. Anna Trough
genre Arctic
Arctic Ocean
Barents Sea
Fram Strait
makarov basin
genre_facet Arctic
Arctic Ocean
Barents Sea
Fram Strait
makarov basin
op_relation Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792
https://doi.org/10.5194/os-16-405-2020
https://noa.gwlb.de/receive/cop_mods_00051110
https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00050767/os-16-405-2020.pdf
https://os.copernicus.org/articles/16/405/2020/os-16-405-2020.pdf
op_rights https://creativecommons.org/licenses/by/4.0/
uneingeschränkt
info:eu-repo/semantics/openAccess
op_rightsnorm CC-BY
op_doi https://doi.org/10.5194/os-16-405-2020
container_title Ocean Science
container_volume 16
container_issue 2
container_start_page 405
op_container_end_page 421
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