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Aspects of convection in the Labrador/Irminger Seas

Aspects of convection in the Labrador/Irminger Seas. R.S. Pickart Department of Physical Oceanography, WHOI. Outline Brief overview of WHOI projects with ties to convection in the Labrador/Irminger Seas. Irminger Sea storm , Oct 2008 Photo by Kathryn Smith. Project #1.

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Aspects of convection in the Labrador/Irminger Seas

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  1. Aspects of convection in the Labrador/Irminger Seas R.S. Pickart Department of Physical Oceanography, WHOI Outline Brief overview of WHOI projects with ties to convection in the Labrador/Irminger Seas Irminger Sea storm , Oct 2008 Photo by Kathryn Smith

  2. Project #1 Annual absolute velocity structure along AR7W in the Labrador Sea since 1995PIs: M. Hall and D. Torres Data: Lowered/shipboard ADCP; hydrography Goals: Quantify variability in the velocity field, especially the boundary currents, using LADCP and absolute geostrophic velocity. Estimate the overturning and horizontal circulation, mass and heat flux. Relate this to convection and forcing. AR7W line

  3. Project #1 (continued) 1996 Lowered ADCP section Cumulative transport along AR7W

  4. Project #2 Hydrobase ICES BIO Time distribution of sections Space distribution of sections Mean, Seasonal and Interannual Variability of the West Greenland and Irminger Currents PIs: T. Rykova, F. Straneo, E. Buch Data: Historical hydrographic data (Hydrobase; ICES; BIO) and altimeter. Goals: (i) Estimate the transports of heat, mass, salt and their variability. (ii) Connection to Labrador Sea convection.

  5. Project #2 (continued) Mean sections from 1992—2007 Temp. Sal. Dens. Vel.

  6. Project #3 Freshwater Exchange between the Hudson Bay System and the Labrador Sea PIs: F. Straneo, F. Saucier, Y. Gratton, D. Sutherland, M. Harvey, M. Starr, M. Gosselin Data: Hydrographic sections across the Strait, mooring arrays, shipboard ADCP. Goals: Estimate the exchange through Hudson Strait, determine what controls its variability, and assess its downstream impact on the Labrador Sea.

  7. Project #3 (continued) Quebec Baffin Is. Outflow: 2004-2007, 2008-2009 Inflow: 2008-2009 Quebec Baffin Is.

  8. Project #4 Convection in the western subpolar gyre as part of the coupled atmosphere-ocean-ice-land systemPIs: K. Våge and R. Pickart Example of Greenland tip jet Data: Argo floats; NARR, NCEP, ERA-40 re-analysis fields; satellite-blended Sea Winds Reynolds SST/ice; AMSR-E ice. Goals: Investigate the large-scale forcing and context within which convection occurs in the Labrador/Irminger Seas. Assess the predictability of the system. ERA-40 tip jet trajectories

  9. Project #4 (continued) Composite mixed-layer depth from 2000-2007 Våge et al. (Nature Geoscience, in press)

  10. Project #4 (continued) Composite mixed-layer depth from 2000-2007, overlain by 2008 (triangles) Våge et al. (Nature Geoscience, in press)

  11. Project #5 Circulation and convection in the Irminger SeaPIs: R. Pickart and K. Våge Data: Hydrographic sections (mainly A1E); vessel-mounted ADCDP (mainly Nuka Arctica); altimeter. Goals: Quantify the properties and circulation of the Irminger gyre (mean; interannual; high/low NAO) and distinguish between local and remote convection.

  12. Project #5 (continued) Mean absolute geostrophic velocity 1999—2005

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