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Circulation in the “Freshwater Switchyard” of the Arctic Ocean Michael Steele Polar Science Center, APL/UW Peter Schlosser & Bill Smethie Lamont-Doherty.

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Presentation on theme: "Circulation in the “Freshwater Switchyard” of the Arctic Ocean Michael Steele Polar Science Center, APL/UW Peter Schlosser & Bill Smethie Lamont-Doherty."— Presentation transcript:

1 Circulation in the “Freshwater Switchyard” of the Arctic Ocean Michael Steele Polar Science Center, APL/UW Peter Schlosser & Bill Smethie Lamont-Doherty Earth Observatory, Columbia Univ. Ron Kwok Jet Propulsion Laboratory, NASA/Caltech) Michael Steele Polar Science Center, APL/UW Peter Schlosser & Bill Smethie Lamont-Doherty Earth Observatory, Columbia Univ. Ron Kwok Jet Propulsion Laboratory, NASA/Caltech)

2 The “Canadian/Greenland Data Hole”: …perhaps the most poorly sampled region of the Arctic Ocean! The “Canadian/Greenland Data Hole”: …perhaps the most poorly sampled region of the Arctic Ocean! Freshwater outflows

3 The “freshwater switchyard”: A good place to detect the origins of freshwater that’s about to leave the Arctic Ocean The “freshwater switchyard”: A good place to detect the origins of freshwater that’s about to leave the Arctic Ocean 3 project components: 1.Large-scale hydrochemical sections (Schlosser + Smethie) 2.Boundary current section at the shelf break (Steele) 3.Sea ice transport studies (Kwok) Large-scale sections Boundary current section …based on Jones et al. (1998); Steele & Boyd (1998); Proshutinsky et al. (2002); Rigor et al. (2002)

4 Details Alert-NP survey : Twin Otter aircraft, 6-9 stations “ THICR ” = TH rough- I ce C TD- R osette, measuring T, S, O 2, oxygen isotopes, tritium/ 3 He, CFC’s, barium, & nutrients. Samples to be drawn at Alert. Boundary current survey : helicopter, 6-9 stations CTD-O, XCP, surface layer bottles. …modified from Newton & Sotirin (1997) Sea ice transport studies : satellites u ice : AMSR passive μwave, ENVISAT SAR; h ice : altimeters on IceSAT (laser) & ENVISAT, CryoSAT (radar)

5 Timeline & Linkages  Other logistics linkages: NPEO ’04 & continuation (?), other Alert-based activities  Potential science linkages: (a) observations: Proshutinsky, Falkner, Lee, other Canadian Archipelago & Fram Strait activities, river discharge & chemical signature data (e.g., Peterson) (b) modeling: Vörösmarty, Lettenmaier, Tremblay, other ice-ocean-river modelers  SEARCH linkages: Switchyard/NPEO: a model for SEARCH hydrochemical surveys? spring, 20032004200520062007 1) THICR development; NPEO does Alert-NP 2) bdry. current survey 3) prelim. satellite anal. 1) THICR deployed for Alert-NP section(s) 3) ENVISAT, AMSR, IceSAT Share helo logistics 2) Share helo logistics w/ Falkner? 3) CRYOSAT Share helo logistics 2) Share helo logistics w/ Falkner?

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