msg validation: an ongoing process
DESCRIPTION
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 [email protected]. Contents. Introduction Data: Cloud Top Height SAF-NWC - PowerPoint PPT PresentationTRANSCRIPT
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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 [email protected]
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Contents
Introduction Data: Cloud Top Height SAF-
NWC Results Conclusions
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CLOUDMAP2 (funded till January 2004)
Production and exploitation of value-added
remote sensing data products on cloud properties and water vapour distributions to characterise sub-grid scale processes within Numerical Weather Prediction Models (NWP)
through validation and data assimilation.
www.cloudmap.org
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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)
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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
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MODIS PML vs SAF-NWC MSG(red line)
Sept 2003 Oct Nov
CTH
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Latitudinal dependency, MODIS vs MSG [RED]
< 40 degree 40-45degree > 70 degree
September
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Low Medium
High
SemitransparentOver lower
Cloud type dependency of CTH for OctoberMODIS vs MSG [RED]
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94 GHz RADAR vs SAF-NWC MSG(red line)
CTH
Sep-Dec2003
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RADARVs MSGaverage
BoxesIndicate Max min
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Statistics of CTH comparison
Modis vs MSG Bias[m] Std dev [m]
Number
Sept -210 2025 1947574
Oct -200 2261 1523472
Nov -386 2319 2567726
Dec -1080 2649 532402
Radar vs MSG -502 2659 33
Only < 10 km 190 1913 28
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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