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Ocean Science An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/os-2018-36
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
23 Apr 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Ocean Science (OS).
Heat, salt, and volume transports in the eastern Eurasian Basin of the Arctic Ocean, from two years of mooring observations
Andrey Pnyushkov1, Igor Polyakov2, Robert Rember1, Vladimir Ivanov4, Matthew B. Alkire3, Igor Ashik4, Till M. Baumann1, Genrikh Alekseev4, and Arild Sundjord5 1International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, AK, USA
2International Arctic Research Center and College of Natural Science and Mathematics, University of Alaska Fairbanks, AK, USA
3Applied Physics Laboratory, University of Washington, Seattle, WA, USA
4Arctic and Antarctic Research Institute, St. Petersburg, Russia
5Norwegian Polar Institute, Fram Centre, Tromsø, Norway
Abstract. This study discusses along-slope volume, heat, and salt transports derived from observations collected in 2013–15 using a cross-slope array of six moorings ranging from 250 m to 3900 m in the eastern Eurasian Basin (EB) of the Arctic Ocean. These observations demonstrate that in the upper 780 m layer, the along-slope boundary current advected, on average, 5.1 ± 0.1 Sv of water, predominantly in the eastward (shallow-to-right) direction. Monthly net volume transports across the Laptev Sea slope vary widely, from ~ 0.3 ± 0.8 in April 2014 to ~ 9.9 ± 0.8 Sv in June 2014. 3.1 ± 0.1 Sv (or 60 %) of the net transport was associated with warm and salty intermediate-depth Atlantic Water (AW). Calculated heat transport for 2013–15 (relative to −1.8 °C) was 46.0 ± 1.7 TW, and net salt transport (relative to zero salinity) was 172 ± 6 Mkg/s. Estimates for AW heat and salt transports were 32.7 ± 1.3 TW (71 % of net heat transport) and 112 ± 4 Mkg/s (65 % of net salt transport). The variability of currents explains ~ 90 % of the variability of the heat and salt transports. The remaining ~ 10 % is controlled by temperature and salinity anomalies together with temporal variability of the AW layer thickness. The annual mean volume transports decreased by 25 % from 5.8 ± 0.2 Sv in 2013–14 to 4.4 ± 0.2 Sv in 2014–15 suggesting that changes of the transports at interannual and longer time scales in the eastern EB may be significant.
Citation: Pnyushkov, A., Polyakov, I., Rember, R., Ivanov, V., Alkire, M. B., Ashik, I., Baumann, T. M., Alekseev, G., and Sundjord, A.: Heat, salt, and volume transports in the eastern Eurasian Basin of the Arctic Ocean, from two years of mooring observations, Ocean Sci. Discuss., https://doi.org/10.5194/os-2018-36, in review, 2018.
Andrey Pnyushkov et al.
Andrey Pnyushkov et al.
Andrey Pnyushkov et al.

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Short summary
This study describes along-slope volume, heat, and salt transports derived from observations collected between 2013 and 2015 in the eastern Eurasian Basin of the Arctic Ocean using a cross-slope array of six moorings. Inferred transport estimates may have wide implications and should be considered when assessing high-latitude ocean dynamics.
This study describes along-slope volume, heat, and salt transports derived from observations...
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