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Satellite Evaluation work at Reading Julien Delanoë/Thorwald Stein/Robin Hogan Collaborations: Richard Forbes (ECMWF)/ Alejandro Bodas-Salcedo (MetOffice)

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Presentation on theme: "Satellite Evaluation work at Reading Julien Delanoë/Thorwald Stein/Robin Hogan Collaborations: Richard Forbes (ECMWF)/ Alejandro Bodas-Salcedo (MetOffice)"— Presentation transcript:

1 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

2 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

3 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

4 40km Obs Lat Temperature 12km 40km Indo-Pacific 9-16 Oct 08 Vertical distribution Horizontal distribution New PSD

5 Frequency of Occurrence of ice More ice clouds in models!

6 UM IWC narrower distribution Higher IWC Higher IWP ECMWF Similar dist but lack of low T clouds Better agreement than UM for IWP

7 Mixed phase clouds January to December 2007 Z-Ztop ()km

8 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?

9 For discussion

10 All North Pole Northern Midlats Southern Midlats Tropical belt South Pole

11 Supercooled layer

12


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