Estimation of heat flux through the eastern Bering Strait |
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| Authors: | Kohei Mizobata Koji Shimada Rebecca Woodgate Sei-Ichi Saitoh Jia Wang |
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| Institution: | (1) Department of Ocean Sciences, Tokyo University of Marine Science and Technology, 4-5-7, Kounan, Minato-ku, 108-8477 Tokyo, Japan;(2) NOAA Great Lakes Environmental Research Laboratory (GLERL), 4840 S. State Road, 48108 Ann Arbor, MI, USA;(3) School of Natural Resources and Environment, Cooperative Institute for Limnology and Ecosystems Research, University of Michigan, Ann Arbor, MI, USA;(4) Hainan Marine Development and Design Institute, Hainan, China |
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| Abstract: | We estimated the northward heat flux through the eastern channel of the Bering Strait during the ice-free seasons between
1999 and 2008. This is likely about half of the total heat flux through the strait. The net volume transport and heat flux
through the eastern channel of the strait were estimated from multiple linear regression models with in-situ/satellite remotely sensed datasets and NCEP reanalysis 10 m wind. The net volume transport was well explained by the west-east
slope of sea level anomaly and NNW wind component at the strait. On the heat flux, the contributions of both barotropic and
baroclinic components were taken into account. Estimated volume transport and vertical profile of temperature were used to
calculate northward heat flux through the eastern channel of the strait. The magnitude of the estimated heat flux is comparable
to estimates from in-situ measurements. Averaged heat flux in the eastern Bering Strait between 2004 and 2007 was about 1.9 times larger than that
between 2000 and 2003. Maximum heat flux occurred in 2004, and same magnitude of heat flux was estimated from 2005 to 2007.
This resulted not only from the increase in northward volume transport but also anomalous warm water intrusion from the Bering
Sea. Our results suggest a candidate among the important parameters controlling heat budget, which contributes to the Arctic
sea ice reduction, whereas more studies are required to confirm that this mechanism is actually responsible for the interannual
and longer timescale variability. |
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