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Trans-Atlantic Linkages - via the subpolar gyre

Trans-Atlantic Linkages - via the subpolar gyre. Hjálmar Hátún. Co-authors: M. R. Payne, G, Beaugrand, P. C. Reid, A. Sandø, H. Drange, B. Hansen, J. A. Jacobsen, D. Bloch. ASOF - Halifax - 08. Faroe Current. Irminger Current. The Subpolare Gyre and the marine climate. Rockall.

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Trans-Atlantic Linkages - via the subpolar gyre

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  1. Trans-Atlantic Linkages- via the subpolar gyre Hjálmar Hátún Co-authors: M. R. Payne, G, Beaugrand, P. C. Reid, A. Sandø, H. Drange, B. Hansen, J. A. Jacobsen, D. Bloch ASOF - Halifax - 08

  2. Faroe Current Irminger Current The Subpolare Gyre and the marine climate Rockall (Hatun et al., Science 2005)

  3. The Subpolare Gyre and the marine climate I R Record high T and S Rockall (obs.) Gyre index Irminger Current (obs.)

  4. 2.The Subpolar Gyre andPlankton

  5. Towing lines since the 1940s Continuous Plankton Recorder (CPR) (SAHFOS, Plymouth)

  6. 2. SPG and plankton Phytoplankton Area south of Iceland ”Gyre pattern” SSH (temperature og currents) Hátún et al., Science, 2005 Sea Surface Temperature Beaugrand, Science 2002 Phytoplankton Calanus finmarchicus

  7. 2. SPG and plankton SST Time-development of the ”gyre-mode” SSH SST Less Cal. Fin. PCI Calanus finmarchicus

  8. Amount of zooplankton with relatively warm water affinities (boreal) 2. SPG and plankton Zooplankton CTA: Cold-Temperate Assemblage calanoid copepods Aetidus armatus, Pleuromamma robusta, Acartia spp. and Metridia lucens.

  9. 3.The Subpolar Gyre andPelagic Fish (blue whiting)

  10. Largest fishery in the North Atlantic! Large mid-1990s increase Stor endringer i kolmule bestanden 3. SPG and blue whiting

  11. 1997 Cold (1990-1996) Warm (1998-2003) Western region Spatial Shift(Catches – all nations) East-West index = (Faroese landings from western region)/ (total faroese landigs) 3. SPG and blue whiting

  12. Blue whiting migration Gyre index Western index

  13. Pilot whale migration

  14. Pilot whale migration (Catch in NE area)/(total catch)

  15. Long-term pilot whale migration

  16. Reversal in 2005-2006! Prediction Is this causing the poor recruitments during 05-06? Good recruitment conditions should resume

  17. Atmospheric forcing • Katja Lohmann, Helge Drange and Mats Bentsen:What caused the strong weakening of the North Atlantic subpolar gyre post 1995?, Submitted. for GRL 0-wind stress curl

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