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SUMMARY:Air-sea exchange variability and its atmosphere/ocean model resolu
 tion-dependence in HadGEM3. - Dr. Pat Hyder\, Met Office
DTSTART:20151211T140000Z
DTEND:20151211T150000Z
UID:TALK61902@talks.cam.ac.uk
CONTACT:Dr Dave Munday
DESCRIPTION:Air-sea heat and moisture exchanges are a conduit through whic
 h the atmosphere exchanges energy with the ocean\, the main climatic energ
 y store.  A summary review of relevant resolution-related process-deficien
 cies in coupled climate models is presented.  Eddies in particular are kno
 wn to modulate surface fluxes by impacting on the boundary layer depth and
  surface winds.  New observational heat flux estimates identify regions of
  high inter-annual air-sea flux variability in northern boundary currents 
 and other ocean eddying regions\, in addition to the equatorial Pacific.  
 Outside the Equatorial Pacific\, inter-annual variability in TOA fluxes is
  much smaller than the surface variability.  Heat exchanged at the surface
  must therefore be distributed or supplied by ocean and atmosphere\, i.e. 
 these high flux regions appear to represent time-varying pumps of heat bet
 ween the ocean and atmosphere.  We analyse inter-annual variability in air
 -sea exchanges in a series of consistent 1\, 1/4 and 1/12o  NEMO ocean onl
 y and coupled NEMO-UM climate simulations\, including a new coupled N512-1
 /12o model\, developed under CHARISMA project.  The representation of both
  time-mean surface fluxes and their inter-annual variability in the bounda
 ry currents and eddying regions appear to improve considerably as the ocea
 n resolution is increased in both coupled and ocean-only runs. Finally\, w
 e discuss the potential implications of these findings to the low resoluti
 on IPCC CMIP coupled model predictions and to NAO predictability in GloSea
 5.
LOCATION:British Antarctic Survey\, Room 307
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