HR: 09:15h
AN: C51C-06    [Abstracts]
TI: Sea Ice Records Spatial and Temporal Variations in Arctic Surface Waters
AU: * Pfirman, S L
EM: spfirman@barnard.columbia.edu
AF: Barnard College, Columbia University , 3009 Broadway, New York, NY 10027 United States
AU: Haxby, W F
EM: bill@ldeo.columbia.edu
AF: Lamont-Doherty Earth Observatory, Columbia University, Route 9W, Palisades, NY 10964 United States
AU: Eicken, H
EM: hajo.eicken@gi.alaska.edu
AF: Geophysical Institute, University of Alaska Fairbanks , 903 Koyukuk Dr., P.O. Box 757320, Fairbanks, AK 99775-7320 United States
AU: Jeffries, M
EM: martin.jeffries@gi.alaska.edu
AF: Geophysical Institute, University of Alaska Fairbanks , 903 Koyukuk Dr., P.O. Box 757320, Fairbanks, AK 99775-7320 United States
AU: Bauch, D
EM: dbauch@ifm-geomar.de
AF: Leibniz-Institut fr Meereswissenschaften IFM - GEOMAR, Dienstgeb„ude GEOMAR (Ostufer) Wischhofstr 1-3, Geb. 8, Kiel, D- 24148 Germany
AB: The surface hydrography of the Arctic Ocean interior can be reconstructed from oxygen isotopic analysis of drifting Arctic sea ice, coupled with back trajectories of ice drift and an ice growth model. The results compare well with values obtained by traditional oceanographic methods and known water mass distributions. Elevated oxygen-18 in ice core profiles reflects growth from Atlantic Water in Barents Sea ice and from the Pacific inflow in floes that that transited the Chukchi Sea. Sea ice grown on the Siberian shelves and while drifting in the Beaufort Gyre has depleted oxygen-18 signatures reflecting river runoff. Ice grown in the Transpolar Drift has an intermediate Atlantic/Beaufort Gyre composition. Future spatial and temporal variations in the surface waters of the ice-bound Arctic Ocean interior, could be estimated by analysis of sea ice floes sampled at exit locations, for example, Fram Strait, and the Barents and Beaufort seas.
DE: 4207 Arctic and Antarctic oceanography
DE: 4215 Climate and interannual variability (3309)
DE: 4283 Water masses
DE: 4540 Ice mechanics and air/sea/ice exchange processes
DE: 1863 Snow and ice (1827)
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting