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NACLIM CT1-3 meeting, at MPI, 19-20/03/2014

NACLIM CT1-3 meeting, at MPI, 19-20/03/2014. On the observed connection between Arctic sea-ice and Eurasian snow in relation to the winter NAO. J. García-Serrano, G. Gastineau, C. Frankignoul LOCEAN-IPSL, Paris, France. NACLIM CT1-3 meeting, at MPI, 19-20/03/2014.

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NACLIM CT1-3 meeting, at MPI, 19-20/03/2014

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  1. NACLIM CT1-3 meeting, at MPI, 19-20/03/2014 On the observed connection between Arctic sea-ice and Eurasian snow in relation to the winter NAO J. García-Serrano, G. Gastineau, C. Frankignoul LOCEAN-IPSL, Paris, France

  2. NACLIM CT1-3 meeting, at MPI, 19-20/03/2014 Negative winter NAO is preceded (in October) by sea-ice reduction in the Barents-Kara Seas (a), positive snow anomalies over northern Eurasia (b), anomalous anticyclonic circulation over the Siberian coast (c) – what is the connection between them?

  3. NACLIM CT1-3 meeting, at MPI, 19-20/03/2014 Sea-ice reduction in the Barents-Kara Seas is associated with positive temperature (T950) anomalies over the eastern Arctic (b), a region dominated by below-zero climatological conditions (a); the anomalous advection of climatological T950 (c) appears to contribute mostly to the land-cooling associated with the snow anomalies

  4. NACLIM CT1-3 meeting, at MPI, 19-20/03/2014 Sea-ice reduction in the Barents-Kara Seas is associated with positive humidity (q950) anomalies over the eastern Arctic (b), a region climatologically dominated by low water vapour (a); the anomalous advection of climatological q950 (c) appears to contribute mostly to the humidity sink associated with the anomalous snowfall

  5. NACLIM CT1-3 meeting, at MPI, 19-20/03/2014 Added-value in the NAO skill from initializing sea-ice (NACLIM / SPECS) J. García-Serrano, C. Frankignoul LOCEAN-IPSL, Paris, France V. Guemas, F. J. Doblas-Reyes IC3, Barcelona, Spain + CNRM-GAME, Toulouse, France

  6. NACLIM CT1-3 meeting, at MPI, 19-20/03/2014 ERA-int (black) vs ensemble-mean (INIT-blue, CLIM-green): there is an increase in the NAO skill. the correlation difference is not statistically significant, but note that the CLIM skill does not exceed the 95% confidence level, whilst the INIT skill does. INIT (sea-ice variability) seems to play a role in the winter 2009/10 (the strongest negative phase on record).

  7. NACLIM CT1-3 meeting, at MPI, 19-20/03/2014 has Arctic sea-ice played a role in the recent, eastward shift of the NAO pattern? Hilmer and Jung (2000, GRL)

  8. 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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