Freshwater fluxes through the western Fram Strait

Physics

Scientific paper

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Oceanography: General: Arctic And Antarctic Oceanography, Oceanography: Physical: Hydrography, Oceanography: Physical: Ice Mechanics And Air/Sea/Ice Exchange Processes

Scientific paper

Two hydrographic and δ18O transects across Fram Strait (Aug-Sept 1997, 1998) are used to examine freshwater contributions to the East Greenland Current (EGC). The EGC featured up to ~16% meteoric water in both years, but was made comparatively more saline through the formation of up to ~11 m of sea ice. We derive meteoric water fluxes of ~3680 km3 yr-1 in Aug-Sept 1997, and ~2000 km3yr-1 in Aug-Sept 1998. The 1997 and 1998 data show a long-term mean sea ice flux through Fram Strait around half the long-term mean meteoric water flux. A 1991 δ18O section [Bauch et al., 1995] yielded a very similar ratio. Our 1998 section reveals fresh, low-δ18O water on the East Greenland shelf whose comparatively large volume constitutes a potentially significant contribution to the total freshwater flux through Fram Strait. Such fluxes are important to the regional and global thermohaline circulation; we suggest that efforts towards monitoring both the EGC and East Greenland shelf waters are thus required.

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