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Instrument: GERB : Geostationary Earth Radiation Budget
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Associated Platforms
METEOSAT

Spectral/Frequency Information
Wavelength Keyword: Ultraviolet
Number Channels: 2 broadband channels, one covering the solar spectrum (0.32 to 4.0 µm), the other covering a wider portion of the electromagnetic spectrum (0.32 to 30 µm).
Spectral/Frequency Coverage/Range: 4.0 - 30 µm
Spectral/Frequency Resolution: With and without quartz filter: 0.32 - 4.0 µm, 0.32 - 30 µm

Related Data Sets
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Description
The MSG system has been outlined to support additional or research missions. ESA selected the Geostationary Earth Radiation Budget (GERB) instrument for flight on the MSG-1 satellite. The GERB instrument is developed by a European consortium led by the Rutherford Appleton Laboratory (RAL), United Kingdom, under a cooperation between the UK, Italy and Belgium. The EUMETSAT Council decided in November 1998 to fund the flight of two additional GERB instruments on MSG-2 and MSG-3.
The first images from the GERB instrument flying on Meteosat-8 (MSG-1) were taken on 12 December 2002.

The principle objective of the GERB mission is to measure the Earth radiation budget, in support of climate research and monitoring. A GERB International Science Team (GIST) had been established and tasked inter alia to define the science requirements, products and processing algorithms, and to implement science and validation activities. The consortium that developed and is responsible for operating the GERB system includes the Rutherford Appleton Laboratory (RAL), UK; Imperial College of Science, Technology and Medicine (ICSTM), UK; Hadley Centre, UK; Leicester University, UK; RMI, Belgium; Advanced Mechanical and Optical Systems Ltd (AMOS Ltd), Belgium; and Officine Galileo, Italy.

The Royal Meteorological Institute of Belgium (RMI) was a key player in the development of the GERB concept, and Belgium provides half of the GERB ground segment infrastructure and services.

The GERB instrument, as part of the satellite, is operated by EUMETSAT in coordination with the GERB Operations Team based at ICSTM.GERB data are received at the EUMETSAT ground segment and passed to the GERB ground segment for data processing. The data and products are then distributed by RAL to centres throughout Europe which use the information to evaluate and improve climate monitoring and Numerical Weather Prediction (NWP) models.

The GERB instrument is a scanning radiometer with two broadband channels, one covering the solar spectrum (0.32 to 4.0 µm), the other covering a wider portion of the electromagnetic spectrum (0.32 to 30 µm). Together these channels are used to derive the thermal radiation emitted by the Earth in the spectral range 4.0 to 30 µm. Data are calibrated on board in order to support the retrieval of radiative fluxes of reflected solar radiation and emitted thermal radiation at the top of the atmosphere with an accuracy of 1%. The radiation budget represents the balance between incoming energy from the Sun and outgoing thermal (longwave) and reflected (shortwave) energy from the Earth.

The GERB broadband channels span the twelve much narrower channels measured by the MSGs other instrument the Spinning Enhanced Visible and Infrared Imager (SEVIRI). Thus GERB fills in the gaps in the thermal radiation spectrum missed by the SEVIRI channels. However, the GERB measures the thermal radiation at a coarser spatial resolution. Back on the ground, RMI scientists use the finer spatial resolution of the SEVIRI data to improve the spatial resolution of the GERB images.

Source: EUMETSAT

Online Resources
http://www.esa.int/esapub/bulletin/bullet111/chapter5_bul111.pdf
http://www3.imperial.ac.uk/spat/research/missions/atmos_missions/gerb/instrument
http://badc.nerc.ac.uk/view/badc.nerc.ac.uk__ATOM__dataent_gerb

Instrument Logistics
Data Rate: 50.6 Kbits/sec (L Band)
Instrument Start Date: 2002-12-12
Instrument Owner: European consortium led by the Rutherford Appleton Laboratory (RAL), United Kingdom, under a cooperation between the UK, Italy and Belgium.