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RMIB involvement in the Geostationary Earth Radiation Budget (GERB) and Climate Monitoring SAF projects
Nicolas Clerbaux Remote sensing from Space Division Royal Meteorological Institute of Belgium
The remote sensing from space division of the RMIB
About 20 scientists/technicians working on the Earth radiation budget:Spaceborn measurement of the total solar irradiance (solar 'constant') – space shuttle, ISS, SOHO, picard.Processing of the GERB instrument data (MSG)Generation of TOA radiative flux products within the CM-SAF (MSG + polar sat.)
GERB project
Science goals:• Improvement of climate models by better understanding
the role of clouds and water vapour in the ERB,• Improvement of Numerical Weather Prediction (NWP)
models by data assimilation or near real-time validation,• Synergy with low orbit satellites observations:
improvement of the diurnal model,• Climate monitoring in the frame of the EUMETSAT
Satellite Application Facility on Climate Monitoring (CM-SAF).
Mission: accurate rapid broadband measurement of the reflected solar and emitted thermal radiation (first BB radiometer on the geo orbit).
Interest of the Meteosat Field-of-View
Also: desertification, African monsoon, marine stratocumulus, volcanoes, biomass burning, …
Aerosols
Tropical Convection
Contrails
Cirrus
blue : cooling effect red : warming effectunit : W/m²
Radiative effect of aerosols
biomass burning
mineral dust
GERB instrument
WAVEBANDSTotal: 0.32 µm - 100.0 µmShortwave, SW: 0.32 µm - 4.0 µm Longwave, LW (by subtraction): 4.0 µm - 100.0 µm
RADIOMETRY SW LWAbsolute Accuracy: < 1.0 % < 1.0 %Signal/Noise: 1250 400Dynamic Range: 0-380 W m-2 sr-1 0-90 W m-2 sr-1
SPATIAL SAMPLING: 44.6 39.3 km (NS EW) at nadir
TEMPORAL SAMPLING:15 minute SW and LW fluxes
CYCLE TIME: Full Earth disc, both channels in 5 minutes
CO-REGISTRATION Spatial: 3 km wrt SEVIRI at satellite sub-pointTemporal: Within 15 min of SEVIRI at each pixel
INSTRUMENT MASS 25 kg
POWER 35 W
Scanning25
6 de
tect
or p
ixel
s
282 steps
Measured (filtered) Radiance Images
shortwave [W/m²/sr] total [W/m²/sr]
GERB data processing
• Geolocation and calibration (RAL, UK)• Tuning of the geolocation wrt SEVIRI• Radiance unfiltering: correction for the instrument
spectral response • Conversion in flux: angular modelling of the radiation
field– Scene identification (surface, cloudiness,…)– Application of angular models
• Enhancement of the spatial resolution: 50km 10km• Near real-time dissemination (FTP) • Long term archiving and dissemination (RAL,UK)
At theRMIB
(Brussels)
Derived Fluxes Images (50km)
Solar [W/m²] Thermal [W/m²]
Current Status GERB acquisition on Meteosat-8 started December 2002
and is ongoing, The instrument is operating well, is stable and the
measurements have low noise Cross-calibration with other instruments (CERES)
indicates good performances of the instrument Release of Edition-1 data in March 2006
NRT generation of Edition-1 data Reprocessing of 02/2004 -> 03/2006 ongoing
10 May 2007 : switch to GERB on Meteosat-9 Validation not yet finished GERB becomes an operational EUMETSAT service
TOA Radiative Products in the Climate Monitoring SAFProduction of
monthly means, daily means, monthly means diurnal cycle
of incoming solar irradiance reflected solar flux emitted thermal flux net flux
from GERB data GERB-like data CERES data
CMSAF Status
Entering in the CDOP phase Reprocessing, reprocessing, reprocessing,... Extension of the dataset to Meteosat first
generation data (GERB-like) possibly generation of global products
Thank you !
More info? http://gerb.oma.be http://cmsaf.oma.be email: gerb@oma.be
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