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SUMMARY:Atmospheric response to marginal-ice-zone drag parameterisation - 
 Ian Renfrew (University of East Anglia)
DTSTART:20170915T131000Z
DTEND:20170915T133000Z
UID:TALK79461@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:A physically-based parameterization of atmospheric surface dra
 g over the marginal-ice-zone has recently been validated and tuned based o
 n a large set of observations of surface stress from the ACCACIA project (
 Elvidge et al. 2016\, Atmos. Chem. and Physics). This parameterization has
  now been implemented in the Met Office Unified Model (MetUM) and is avail
 able for both weather and climate applications. Here we present test resul
 ts for a case study of a cold-air outbreak over and downstream of the MIZ\
 , and for a collection of cases from the ACCACIA field campaign. Our focus
  is on the response of the atmosphere to the changes in surface drag. Prel
 iminary results show that&nbsp\;the new parameterization has a significant
  impact on simulated boundary layer conditions. For example\, boundary lay
 er temperatures over the MIZ during cold air outbreaks are generally reduc
 ed by 2-3 K in the model\, in response to markedly&nbsp\;reduced&nbsp\;sur
 face heat fluxes. Comparisons with aircraft observations reveal the change
 s to generally be beneficial. The implications of these changes for the cl
 imate system will be discussed.&nbsp\; &nbsp\;
LOCATION:Seminar Room 1\, Newton Institute
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