Rob Roebeling

1
Rob Roebeling

• CloudNET meeting
• 18 19 October 2004, Delft
• METEOSAT-8 OBSERVATIONS AND DERIVED CLOUD
  MICROPHYSICAL PROPERTIES

2

• Climate Monitoring Satellite Application
  Facility (CMSAF)
• Funding European Meteorological Satellite
  Organization (EUMETSAT)
• Objective To generate and archive high
  quality data products from meteorological
  satellites (MSG and AVHRR/METOP) on
  a continuous basis, which are
  relevant for climate research.
• DWD (coordinator), FMI, KNMI, RMIB, SMHI
  and Meteo Swiss
• KNMI involvement
• To develop method to retrieve Cloud Physical
  Products from NOAA-AVHRR (and METOP) and MSG.
• To validate the Cloud Physical Products with
  in-situ data of dedicate cloud measurement
  campaigns

3
MSG channels and Currently Derived Physical
Products.
Channel 1 (VIS 0.6) Channel 2 (VIS 0.8) Channel 3
(NIR 1.6) Channel 4 (IR 3.9) Channel 5 (WV
6.2) Channel 6 (WV 7.3) Channel 7 (IR
8.7) Channel 8 (IR 9.7) Channel 9 (IR 10.8)
(Tb) Channel 10 (IR 12) Channel 11 (IR
13.4) Channel 12 (HRV)
Cloud Thermodynamic Phase Cloud Liquid Water
Path Cloud Optical Thickness Effective
Radius Optical depth Cloud Top Temperature Droplet
density
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Radiative Transfer Modelling
Reflectance, ?
tac
Above the cloud

• Phase
• Optical Thickness
• Geometric Thickness
• Droplet Density
• Effective Radius

Scattering and absorption
tbc
Below the cloud
R(sur)
5
MSG images for Channels 1, 3
Channel 1 0.6 microns
Channel 3 1.6 microns
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Calibration and Cloud-phase
Scatterplot 1.6 vs. 0.6 micron channels
Scatterplot 1.6 micron channel, NOAA vs. MSG
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Cloud Optical Depth
Meteosat 8, 19 April 2004
Cloud Liquid Water Path
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Example for Cabauw (Channel 1 3)
NOAA
9
Example for Cabauw (Channel 9, CTT Phase)
NOAA
10
Example for Cabauw (Optical thickness, LWP)
11
Example for Cabauw (Reff, Cloud Thickness (H)
n)
H
Reff (H) t(H) H n (cst)
12
Conclusions

• Meteosat-8 and NOAA reflectance at 0.6
  micron are similar.
• Meteosat-8 and NOAA reflectance at 1.6
  micron have a ratio of 1.3
• All 12 channels will be included in the
  CloudNet data-base for the three sites.
• Products to be include in the CloudNet
  data-base
• Cloud Thermodynamic Phase, Cloud Liquid
  Water Path,
• Cloud Optical Thickness, Effective
  Radius,
• Cloud Top Temperature, Droplet
  density