Exchange of warming deepwaters across Fram Strait
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Authorsvon Appen, W.J.; Schauer, U.; Somavilla, R. (Raquel); Bauerfeind, E.; Beszczynska-Möller, A.
Greenland Sea Deep Water
Eurasian Basin Deep Water
Bottom water warming
Current meters measured temperature and velocity on 11 moorings from 1997 to 2014 in Fram Strait between Svalbard and Greenland at the only deep passage from the Nordic Seas to the Arctic Ocean. The sill depth in Fram Strait is 2545 m. The observed temperatures vary between the colder Greenland Sea Deep Water and the warmer Eurasian Basin Deep Water. Both end members show a linear warming trend of 0.11 0.02 C/decade (GSDW) and 0.05 0.01 C/decade (EBDW) in agreement with the deep water warming observed in the basins to the north and south. At the current warming rates, GSDW and EBDW will reach the same temperature of -0.71 C in 2020. The deep water on the approximately 40 km wide plateau near the sill in Fram Strait is a mixture of the two end members with both contributing similar amounts. This water mass is continuously formed by mixing in Fram Strait and subsequently exported out of Fram Strait. Individual measurements are approximately normally distributed around the average of the ...
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