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CCI Cloud Assessment. Mark Ringer, Met Office Hadley Centre CMUG 4 th Integration meeting, Exeter – June 2 nd – 4 th , 2014. Introduction. CCI clouds produces a range of cloud parameters: cloud amount, cloud liquid water, cloud effective radius, etc

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cci cloud assessment

CCI Cloud Assessment

Mark Ringer, Met Office Hadley Centre

CMUG 4th Integration meeting, Exeter – June 2nd – 4th, 2014

introduction
Introduction
  • CCI clouds produces a range of cloud parameters: cloud amount, cloud liquid water, cloud effective radius, etc
  • Includes merged (all sensors) and individual sensor products (AATSR, MODIS, AVHRR)
  • Phase 1 prototype data set covers 2007 – 2009
  • Product definitions correspond to GEWEX cloud assessment – not specifically model-oriented
  • We previously used ISCCP as a precursor data set
general comments comparison with other cloud data sets
General comments – comparison with other cloud data sets
  • Cloud amount underestimated over global oceans
  • High-level cloud underestimated over land in tropics and mid-latitudes
  • Low-level cloud underestimated over sub-tropical oceanic stratocumulus areas (e.g. California, Peru)
  • Large underestimate of thin cirrus cloud (algorithm? channel selection?)
slide5

Cloud liquid water

HadGEM2 vs. obs: JJA 2007

comments
Comments
  • Interpretation of model simulation depends on data set being used for comparison
  • We need to understand how/why CCI differs from other data sets of comparable cloud parameters
  • Why is LWP closer to SSM/I?
  • Why is CCI MODIS/ATSR different from standard MODIS/ATSR products?
  • Interpretation of merged products?
phase 2 modelling perspective
Phase 2 – modelling perspective
  • A long-term record suitable for identifying trends in cloud would be of great interest…but there are risks
  • Could also focus on interannual variability & model evaluation/development to show value of CCI
  • Consider relation to large amount of current & future work in this area, e.g. CFMIP, WCRP grand challenge on clouds, circulation & climate sensitivity
  • Specific model-oriented products may be required
  • Merged products unlikely to be of use to modellers – emphasis on forward-modelling individual sensors (COSP)
slide10

Interannual variability

1997-98 ENSO: Models vs. ISCCP