| Summary: | Our 2015 Arctic research cruise aboard the RV "Akademik Tryoshnikov" was the tenth expedition under the aegis of NABOS (the Nansen and Amundsen Basins Observational System) conducted by the International Arctic Research Center (IARC) at the University of Alaska Fairbanks (UAF) and the Applied Physics Laboratory (APL) of the University of Washington (UW), in partnership with the Arctic and Antarctic Research Institute (AARI, St. Petersburg, Russia) and Alfred Wegener Institute (AWI, Bremerhaven, Germany). The main goal of this NABOS project is to provide a quantitative assessment of circulation and water-mass transformation along the principal pathways transporting water from the Nordic Seas to the Arctic Basin. Specific features of the 2015 NABOS cruise, in addition to our "standard" cruise program, were our extensive mooring program and the eastward extension of our traditional area from the eastern Eurasian Basin to the northern East Siberian Sea. New, unique scientific data collected along the Eurasian and Makarov basin continental margin under extreme climatological conditions will be vital for understanding Arctic climate change. Eight moorings were recovered, and thirteen were deployed. Unfortunately we could not locate one of our moorings (M5), off Severnaya Zemlya; there is, however, a chance that a more extensive search on a future cruise will help recover this mooring. Due to a lack of ship time, we also did not have a chance to approach mooring M9, which has been deployed in the northern East Siberian Sea during the summer of 2008. We maintain hopes for the recovery of this mooring as well.
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