Rob Roebeling

CloudNET meeting18 – 19 October 2004, Delft

METEOSAT-8 OBSERVATIONS AND DERIVED CLOUD MICROPHYSICAL PROPERTIES

Climate Monitoring Satellite Application Facility (CMSAF)

Funding: European Meteorological Satellite Organization (EUMETSAT)

Objective: To generate and archive high quality data products frommeteorological 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

MSG channels and Currently Derived Physical Products.

Cloud Thermodynamic PhaseCloud Liquid Water PathCloud Optical Thickness

Effective RadiusOptical depth

Cloud Top TemperatureDroplet density

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)

Radiative Transfer Modelling

R(sur)

Above the cloud

Below the cloud

ac

bc

Scattering and absorption• Phase• Optical Thickness • Geometric

Thickness• Droplet Density• Effective Radius

Reflectance,

MSG images for Channels 1, 3

Channel 1: 0.6 microns

Channel 3: 1.6 microns

Calibration and Cloud-phase

Water Clouds

Land

Sea

Ice Clouds

Scatterplot 1.6 vs. 0.6 micron channels

Scatterplot 1.6 micron channel, NOAA vs. MSG

Cloud Optical Depth

Meteosat 8, 19 April 2004 Cloud Liquid Water Path

Example for Cabauw (Channel 1 & 3)

NOAA

Example for Cabauw (Channel 9, CTT & Phase)

NOAA

Example for Cabauw (Optical thickness, LWP)

Example for Cabauw: (Reff, Cloud Thickness (H) & n)

Reff (H) + (H)

H + n (cst)

H

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