Evaluation of CFMIP2 models using COSP: the role of ... - euclipse

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Evaluation of CFMIP2 models using COSP: the role of ... - euclipse

Evaluation of CFMIP2 models using

COSP: the role of clouds in the radiation

budget over the Southern Ocean

A. Bodas-Salcedo

© Crown copyright Met Office

EUCLIPSE-CFMIP meeting, Paris, May 29 2012


CMIP3 coupled models

(Trenberth and Fasullo, J. Clim., 2010)

© Crown copyright Met Office 2


Data and methodology

• AMIP experiment. Daily-means of ISCCP simulator outputs,

radiative fluxes and MSLP. Additional COSP diagnostics for

some models.

• Daily ISCCP-FD radiative fluxes and ERA40 MSLP.

• Region 40S – 70S.

• Projection onto ISCCP clusters from Williams and Webb, Clim.

Dyn., (2009). Compositing around cyclone centres following

Field and Wood, J. Clim., (2007). Example of this methodology

in Bodas-Salcedo et al., J. Clim., (2012).

• Preliminary results.

© Crown copyright Met Office 3


CRE bias around cyclone

centres

© Crown copyright Met Office 4


Cluster RFO: ISCCP

© Crown copyright Met Office 5


© Crown copyright Met Office 6


© Crown copyright Met Office 7


© Crown copyright Met Office 8


© Crown copyright Met Office 9


Summary

•Methodology that combines clustering and

compositing, linking cloud radiative properties and

synoptic conditions.

•Preliminary results from analysis of AMIP experiment:

•Spatial structure in CRE errors in cyclones, related

with errors in cloud regimes.

•Too frequent frontal cloud seems to explain most of

the error in LW CRE.

•Some models show some similarities: too much

shallow cumulus and too little stratocumulus.

•In some cases, the results suggest compensation of

errors between frequency of occurrence and

radiative properties.

© Crown copyright Met Office 10


© Crown copyright Met


CMIP5 AMIP rsds

© Crown copyright Met Office 12


ISCCP cloud: SO climatology

© Crown copyright Met Office 13


© Crown copyright Met Office 14


© Crown copyright Met Office 15


© Crown copyright Met Office 16


CloudSat reflectivities

© Crown copyright Met Office 17


CALIOP Scattering ratio

© Crown copyright Met Office 18

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