Presentation on theme: "Satellite Evaluation work at Reading Julien Delanoë/Thorwald Stein/Robin Hogan Collaborations: Richard Forbes (ECMWF)/ Alejandro Bodas-Salcedo (MetOffice)"— Presentation transcript:
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
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
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
40km Obs Lat Temperature 12km 40km Indo-Pacific 9-16 Oct 08 Vertical distribution Horizontal distribution New PSD
Frequency of Occurrence of ice More ice clouds in models!
UM IWC narrower distribution Higher IWC Higher IWP ECMWF Similar dist but lack of low T clouds Better agreement than UM for IWP
Mixed phase clouds January to December 2007 Z-Ztop ()km
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?
All North Pole Northern Midlats Southern Midlats Tropical belt South Pole