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MSG validation: An Ongoing Process

MSG validation: An Ongoing Process. Paul de Valk(KNMI), Catherine Naud(UCL), Marcel Derrien, Herve LeGleau(CMS), Tim Smyth (PML), Elizabeth Slack, Charles Wrench (RAL) Royal Netherlands Meteorological Institute paul.de.valk@knmi.nl. Contents. Introduction Data: Cloud Top Height SAF-NWC

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MSG validation: An Ongoing Process

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  1. MSG validation: An Ongoing Process Paul de Valk(KNMI), Catherine Naud(UCL), Marcel Derrien, Herve LeGleau(CMS), Tim Smyth (PML), Elizabeth Slack, Charles Wrench (RAL)Royal Netherlands Meteorological Institute paul.de.valk@knmi.nl

  2. Contents • Introduction • Data: Cloud Top Height SAF-NWC • Results • Conclusions

  3. CLOUDMAP2 (funded till January 2004) Production and exploitation of value-added remote sensing data products oncloud propertiesand water vapour distributions to characterise sub-grid scale processes within Numerical Weather Prediction Models (NWP) throughvalidation and data assimilation. www.cloudmap.org

  4. Data for validation of Cloud Top Height CTH • SAF-NWC products based on MSG (cloud type, coverage, CTH) 11 and 12 hr • MODIS products produced PML (coverage, CTP) • Chilbolton 94 GHz Radar products (CTH)

  5. Problems encountered • Collocation, spatial and temporal • Slanted views (polar vs geostationary) • Different pixel size dimensions • Different volume sampling • Conversion CTP to CTH (HiRLAM) A solution: consider only high coverage

  6. MODIS PML vs SAF-NWC MSG(red line) Sept 2003 Nov Oct CTH

  7. Latitudinal dependency, MODIS vs MSG [RED] < 40 degree 40-45degree > 70 degree September

  8. Medium Low Cloud type dependency of CTH for October MODIS vs MSG [RED] Semitransparent Over lower High

  9. 94 GHz RADAR vs SAF-NWC MSG(red line) CTH Sep-Dec 2003

  10. RADAR Vs MSG average Boxes Indicate Max min

  11. Statistics of CTH comparison

  12. Conclusions • Good agreement both with MODIS and Radar, especially high clouds • Indication of overestimation of CTH for low clouds by SAF-NWC but… • Latitudinal dependency and Cloud type dependency of MSG CTH. • MODIS PML CTH frequency low at 4000 m

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