Two Instruments Flying On Each Of Terra And Aqua
Data are available from 5 CERES instruments - see http://eosweb.larc.nasa.gov/PRODOCS/ceres/level3_fsw_table.html for temporal coverage. Comprehensive documentation and discussion of data and products is available on http://eosweb.larc.nasa.gov/PRODOCS/ceres/table_ceres.html#data_products
See the Langley Atmospheric Science Data Center CERES Data Products web site (http://eosweb.larc.nasa.gov/PRODOCS/ceres/table_ceres.html#data_products) for specifics.
Satellite Instruments
The Clouds and the Earth's Radiant Energy System (CERES) experiment observes solar-reflected and Earth-emitted radiation from the top of the atmosphere to the Earth's surface. Cloud properties are determined using simultaneous measurements by other EOS instruments such as the Moderate Resolution Imaging Spectroradiometer (MODIS). Analyses of the CERES data, which build upon the foundation laid by previous missions such as the Earth Radiation Budget Experiment (ERBE), will lead to a better understanding of the role of clouds and the energy cycle in global climate change. CERES instruments were launched aboard the Tropical Rainfall Measuring Mission (TRMM) in November 1997, and on the EOS Terra and Aqua satellites in December 1999 and May 2002. Two additional instruments will fly on the EOS Aqua spacecraft in 2002. Multiple satellites are needed to provide adequate temporal sampling since clouds and radiative fluxes vary throughout the day. The first 24 months of CERES data collected on both TRMM and Terra demonstrate that the CERES instruments are substantially improved over the ERBE instruments. The CERES data show lower noise, improved ties to the ground calibration in absolute terms, and smaller fields of view. CERES instrument calibration stability on TRMM and Terra is typically better than 0.2%, and calibration consistency from ground to space is better than 0.25%. Onboard calibration sources provide traceability of the measurements to the International Temperature Scale of 1990 at the 0.2% level. Such levels of accuracy have never before been achieved for radiation budget instruments.
Bruce Wielicki
NASA Langley Research Center
Mail Stop 420 NASA Langley Research Center Hampton, VA 23681-2199
Measurment TypeVisible/IR-broadband radiometer
Platform TypeTerra and Aqua
OrbitSun synchronous
Spectral CoverageFull spectrum
Scan PatternCross track
VariablesEarth radiation budget
Altitude705 (Terra and Aqua); 350 km (TRMM)
InclinationSun-synchronous 98-degree inclination
Repeat Time16-day repeat cycle
Wavelength0.3 to 100um
Number of Bands3
Start DateMar 2001
Temporal CoverageContinuous coverage began from Terra in March 2001
Swath WidthLimb to limb
Resolution 120km
See the CERES Publications page on the web site (http://asd-www.larc.nasa.gov/ceres/pubs.html)
Terra and Aqua both have 2 CERES instruments, once scanning cross-track and the other in a rotating azimuthal plane to improve the accuracy of angular models used to derive the Earth's radiative balance.
3 Sep 2009 13:47