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The distribution of #delta# "1"8O in the Arctic Ocean: implications for the freshwater balance of the halocline and the sources of deep and bottom waters

By NY (United States). Lamont-Doherty Earth Observatory) Palisades D. (Columbia Univ. Bauch and Bremerhaven (Germany) Alfred-Wegener-Institut fuer Polar- und Meeresforschung

Abstract

Data from sections across the Eurasian Basin of the Arctic ocean occupied by the German Research Vessel Polarstern in 1987 and by the Swedish icebreaker Oden in 1991 are used to derive information on the freshwater balance of the Arctic ocean halocline and on the sources of the deep waters of the Nansen, Amundsen and Makarov basins. Salinity, #delta#"1"8O and mass balances allow separation of the river-runoff and the sea-ice meltwater fractions contained in the Arctic halocline. This provides the basis for tracking the river-runoff signal from the shelf seas across the central Arctic Ocean to Fram Strait. The halocline has to be divided into at least three lateral regimes; the southern Nansen Basin with net sea-ice melting, the northern Nansen Basin and Amundsen Basin with net sea-ice formation and increasing river-runoff fractions, and the Canadian Basin with minimum sea-ice meltwater and maximum river-runoff fractions and water of Pacific origin. In the Canadian Basin, silicate is used as a tracer to identify pacific water entering through Bering Strait and an attempt is made to quantify its influence on the halocline waters of the Canadian Basin. For this purpose literature data from the CESAR and LOREX ice camps are used. (orig.)Available from TIB Hannover: RN 9219(159) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Topics: 08A - Oceanography, FRESHWATER BALANCE: M, EURASIAN BASIN, DEEP WATER SOURCES, SALINITY, ARCTIC HALOCLINE, SILICATE TRACER, ICE EXPORT RATES
Year: 1995
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Provided by: OpenGrey Repository
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