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Atlantic water transports to the Arctic and their impact on sea ice

Atlantic water transports to the Arctic and their impact on sea ice. C. Herbaut , M.-N. Houssais, A.-C. Blaizot a nd S. Close LOCEAN, UPMC. Atlantic Water pathways in the Arctic. Polyakov et al., 2012. Barents Sea. Sea ice extent. Surface circulation.

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Atlantic water transports to the Arctic and their impact on sea ice

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  1. Atlantic water transports to the Arctic and their impact on seaice C. Herbaut, M.-N. Houssais, A.-C. Blaizot and S. Close LOCEAN, UPMC

  2. Atlantic Water pathways in the Arctic Polyakov et al., 2012

  3. Barents Sea Sea ice extent Surface circulation

  4. Winter SeaIce Concentration (SSMR - SSM-I) Northern mode and Eastern mode SIC standard deviation (1979-2011) Seaice area R= 0.38 Northern Mode Eastern Mode

  5. Regression of the SIC on Northern and Eastern modes Eastern Mode Index Northern Mode Index

  6. ORCA025 Arctic-Atlantic configuration ERA-I forcing (1979-2011) Lag 0 Seaice production Wind stress Northern Mode  Northerlywinds Eastern Mode  Easterlywinds

  7. Ocean impact on the Northern mode Climatology Correlation BSO heat transport on Northern Mode Regression on the Northern mode Lag 0 Ouflow Inflow Net

  8. Reemergence of the AW temperature anomalies Regression of temperature at 110 meters on the northern mode at lag -1 year Lag -1 year Correlation BSO heat content on Northern Mode Oceanheat content Divergence of heat transport Surface heat flux

  9. Impact of the SST anomalies on the atmosphere (and SIC) ? Regression of winter SLP on October SST Regression of OND SST on the Northern Mode

  10. Atlantic Water pathways in the Arctic

  11. FramStrait Temperature Model Observations Fram Strait Longitude Longitude

  12. Atlantic Water proprerties in FramStrait in winter (JFM) Eof1 temperature38% Eof1 Velocity 34% Eof1 heat transport 48% PC1s Temperature Velocity Heat transport Correlation: Velocity – Heat transport = 0.88 Temperature - Heat transport = 0.50

  13. Atlantic Water circulation Regression on PC1 of velocity at FramStrait Currents at 230 meters JFM SLP DJF • Cyclonic circulation over the NordicSeas + ArcticOcean • Arctic Oscillation

  14. Regression the current at 230 meters on PC2 of velocity in the WSC localized circulation in the Barents Sea

  15. Atlantic Water temperature (230 m) Regression on PC1 of temperature in FramStrait Lag -1 year Lag 0 • Temperature anomalies over the Barents Sea + FramStrait Branch

  16. Constant passive tracer sources : • BSO • FramStrait (0-800 m) Distribution of passive tracers at 230 meters FramStraitBranch Barents SeaBranch 2008

  17. Variability of the Atlantic Water Interannualvariability at Kola Section Model Observations Seasonalvariability if the framStrait Branch Northof Svalbard off Laptev Sea

  18. Vertical distribution of passive tracers and temperature FramStraitBranch Barents SeaBranch Off Laptev Sea 2008 • Core of the FSB tracer coïncides with the temperature maximum • Maximum of the BSB tracer along the coast

  19. Hovmoeller of Temperaturealong the slope of the Eurasien Basin • Propagation of twostrongwarmingevents • Strongdecrease of temperature and tracer east of St Anna Trough

  20. Off Laptev Sea West of St Anna Trough FSB Tracer BSB Tracer Temperature Correlation: 0.78 Correlation: -0.78 Correlation: 0.48 Variability of the temperature in the core of the Atlantic branchlinkedwith the variability of the exchange between the Barents and FramStrait Branches.

  21. Impact of the temperaturevariability in the FSB on seaiceproperties Climatologicalseaicemelt in winter (cm/d) Regression of the seaicemelt in winter on PC1 of T in FramStrait • Hints of influence north of the Barents Sea

  22. Next • Analyse the covariability of the AW branches in FS and BS • Diagnose ocean vertical heat fluxes and their impact on seaice • Analyse the atmospheric modes linked to seaice/SST variability • Otherseasons …

  23. The research leading to these results has received funding from the European Union 7th Framework Programme (FP7 2007-2013), under grant agreement n.308299 NACLIM www.naclim.eu

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