HR: 17:15h
AN: A34D-06 INVITED    [Abstracts]
TI: Evaluation of shortwave flux profiles in the Hadley Center Global Environmental Model (HadGEM1) with CERES TRMM products
AU: * Su, W
EM: Wenying.Su-1@nasa.gov
AF: Science Systems and Applications, INC., MS 420, NASA Langley Research Center, Hampton, VA 23681, United States
AU: Bodas-Salcedo, A
EM: alejandro.bodas@metoffice.gov.uk
AF: Met Office Hadley Centre, FitzRoy Rd, Exeter, EX1 3PB, United Kingdom
AU: Charlock, T
EM: Thomas.P.Charlock@nasa.gov
AF: NASA Langley Research Center, MS 420, NASA Langely Research Center, Hampton, VA 23693, United States
AB: The value of checking the shortwave fluxes produced by a climate model with reliable data at both the surface and top of atmosphere (TOA) is well recognized. An examination of the full vertical profile of shortwave fluxes, however, provides further insight on the integrated effects of cloud and aerosol processes, as well as the distribution of water vapor, on fluxes in the model; and will be helpful for improving the simulation of the present- day climate and the predictions of climate change. Cloud and the Earth's Radiant Energy System (CERES) on TRMM satellite provides broadband TOA observations in low and mid latitudes from January 1998 to August 1998. CERES's surface and atmospheric radiation budget (SARB) group also calculates fluxes at the surface, 500 hPa, 200 hPa, 70 hPa, and TOA, using inputs of cloud and aerosol optical properties derived from the narrowband VIRS imager on TRMM; and an operational aerosol assimilation. Validation of the SARB calculations are extensive at the TOA, where each footprint in the complete domain is compared with explicit broadband observations by CERES; at the surface, the computed fluxes are routinely compared with quality measurements at ground 50 sites; these checks establish the uncertainties of the computed fluxes within the atmosphere. To compare these flux profiles with those from HadGEM1, we developed a method to correct the insufficient diurnal coverage of CERES on TRMM, since TRMM spacecraft does not provide a true diurnal coverage. The diurnal coverage corrected monthly-mean shortwave flux profiles in the tropics are compared with those from HadGEM1 for clear sky and all sky conditions. The differences at each level are analyzed and the causes are discussed.
DE: 0321 Cloud/radiation interaction
DE: 0360 Radiation: transmission and scattering
DE: 3311 Clouds and aerosols
DE: 3359 Radiative processes
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting