Pacific ventilation of the Arctic Ocean's lower halocline by upwelling and diapycnal mixing over the continental margin

Details Pacific ventilation of the Arctic Ocean's lower halocline by upwelling and diapycnal mixing over the continental margin Pacific ventilation of the Arctic Ocean's lower halocline by upwelling and diapycnal mixing over the continental margin

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3218609w&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 18, CiteID L18609

Physics

17

Oceanography: General: Upwelling And Convergences (4964), Oceanography: General: Arctic And Antarctic Oceanography (9310, 9315), Oceanography: Physical: Hydrography And Tracers, Oceanography: Physical: Topographic/Bathymetric Interactions, Oceanography: Physical: Upper Ocean And Mixed Layer Processes

Scientific paper

Pacific winter waters, a major source of nutrients and buoyancy to the Arctic Ocean, are thought to ventilate the Arctic's lower halocline either by injection (isopycnal or penetrative) of cold saline shelf waters, or by cooling and freshening Atlantic waters upwelled onto the shelf. Although ventilation at salinity (S) > 34 psu has previously been attributed to hypersaline polynya waters, temperature, salinity, nutrient and tracer data suggest instead that much of the western Arctic's lower halocline is in fact influenced by a diapycnal mixing of Pacific winter waters (with S ~ 33.1 psu) and denser eastern Arctic halocline (Atlantic) waters, the mixing taking place possibly over the northern Chukchi shelf/slope. Estimates from observational data confirm that sufficient quantities of Atlantic water may be upwelled to mix with the inflowing Pacific waters, with volumes implying the halocline over the Chukchi Borderland region may be renewed on timescales of order a year.

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