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Published byThomas Dalton Modified over 11 years ago
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Satellite Evaluation work at Reading Julien Delanoë/Thorwald Stein/Robin Hogan Collaborations: Richard Forbes (ECMWF)/ Alejandro Bodas-Salcedo (MetOffice) Cloud/radar/radiation collaboration meeting How best can we work together to evaluate model changes 17-18 November in Reading
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What do we do from space? Evaluation of cloud representation in models We retrieve cloud fraction and cloud properties Ice clouds/precip (Julien/Thorwald/Robin) Ice cloud fraction/frequency of occurrence/IWC/IWP Mixed phase clouds (Julien/Robin) Supercooled water fraction
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UM+Simulator vs CloudSat (Thorwald) 40km Same Z threshold OLD: old PSD parameterisation NEW: new PSD parameterisation, consistent with UM Model, narrower distribution. Why does the new model show a shifted distribution to the small Z? The inconsistent param does not look closer to CloudSat
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40km Obs Lat Temperature 12km 40km Indo-Pacific 9-16 Oct 08 Vertical distribution Horizontal distribution New PSD
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Frequency of Occurrence of ice More ice clouds in models!
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UM IWC narrower distribution Higher IWC Higher IWP ECMWF Similar dist but lack of low T clouds Better agreement than UM for IWP
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Mixed phase clouds January to December 2007 Z-Ztop ()km
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Conclusion Data availability: – Cloud mask, entire period of CloudSat/CALIPSO – Ice properties: 1,5 years (all 2007) What would modellers need to improve Cloud representation in GCM?
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For discussion
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All North Pole Northern Midlats Southern Midlats Tropical belt South Pole
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Supercooled layer
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