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Overview of the “Geostationary Earth Radiation Budget (GERB)” Experience. Nicolas Clerbaux Royal Meteorological Institute of Belgium (RMIB) In collaboration.

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Presentation on theme: "Overview of the “Geostationary Earth Radiation Budget (GERB)” Experience. Nicolas Clerbaux Royal Meteorological Institute of Belgium (RMIB) In collaboration."— Presentation transcript:

1 Overview of the “Geostationary Earth Radiation Budget (GERB)” Experience. Nicolas Clerbaux Royal Meteorological Institute of Belgium (RMIB) In collaboration with: Imperial College, UK. Rutherford Appleton Laboratory (RAL), UK. GERB International Science Team (GIST).

2 What it GERB ? New instrument on the Meteosat Second Generation satellites of EUMETSAT, First broadband imager radiometer observing the Earth from a geostationary satellite

3 Outline of the talk The GERB mission/science goals : why we need new measurements of the Earth Radiation Budget (ERB), Interest of the Meteosat field-of-view, GERB instrument, data processing, derived products and current status, Examples of GERB data usage

4 The Earth Radiation Budget (ERB)

5 Diurnal and synoptic variability Lake Victoria Congo Tanzania Kenya Uganda Rwanda Burundi Meteosat-8 images – 12 July 2004

6 GERB Mission Measurement of the ERB with high temporal sampling thanks to the geostationary orbit. 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). Science goals

7 Interest of the Meteosat Field-of-View (1/2) Also: desertification, African monsoon, marine stratocumulus, vulcaneos, biomass burning, … Aerosols Tropical Convection Contrails Cirrus

8 Biomass burning Mineral dust Well-mixed greenhouse gases Radiative effect of aerosols blue: cooling effect red: warming effect unit : W/m² Interest of the Meteosat Field-of-View (2/2)

9 GERB instrument, data processing, derived products and status Characteristics Scanning mechanism Instrument data Data processing Derived images of solar and thermal flux Current data status

10 GERB characteristics WAVEBANDS Total: 0.32 µm - 100.0 µm Shortwave, SW: 0.32 µm - 4.0 µm Longwave, LW (by subtraction):4.0 µm - 100.0 µm RADIOMETRY SW LW Absolute Accuracy:< 1.0 % < 1.0 % Signal/Noise: 1250 400 Dynamic 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- point Temporal:Within 15 min of SEVIRI at each pixel INSTRUMENT MASS 25 kg POWER 35 W DIMENSIONS 476 mm  275 mm  345 mm

11 Average three scans in each channel to improve S/N Total repeat time = 169.2*6 ~ 17 min. 256 detector pixels 262 steps 256 detector pixels 282 steps Satellite rotation period = 0.6 s 282 steps for full Earth disc = 169.2 s Between each Earth scan, internal BB measurement taken for calibration At correct viewing geometry, calibration monitor records scattered solar light as a relative measure over time 2 channels: Total Total+quartz filter (SW) GERB scanning

12 Measured Radiance Images shortwave [W/m²/sr] total [W/m²/sr]

13 GERB data processing Geolocation and calibration (RAL) 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 by RMIB Long term archiving and dissemination (RAL) At the RMIB (Brussels)

14 Derived Fluxes Images (50km) Solar [W/m²] Thermal [W/m²]

15 Current Data 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 GERB data processing is still under validation, public release expected for end of 2005. GERB data will be available to the scientific community free of charge.

16 Image courtesy NASA GERB solar flux MODIS image Example of usage (1/2) 27 January 2003

17 UK-MO Unified Model GERB (Courtesy UK Met Office) Solar Flux Thermal Flux Example of usage (2/2)

18 Conclusions The GERB data is unique! European initiative in operational climate monitoring Long term mission (+/- 15 years): GERB instrument will fly on Meteosat-9, -10 and -11 Interest for climate modelling and meteorology Important contribution of the RMIB. More info at: http://gerb.oma.be

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