CERES Synoptic Product: Methodology and Validation of Surface Radiant Flux

Journal of Atmospheric and Oceanic Technology - Tập 32 Số 6 - Trang 1121-1143 - 2015
David A. Rutan1, Seiji Kato2, David R. Doelling2, Fred G. Rose1, L. Nguyen1, Thomas E. Caldwell1, Norman G. Loeb2
1NASA Langley Research Center, Hampton, Virginia
2SSAI, Hampton, Virginia

Tóm tắt

AbstractThe Clouds and the Earth’s Radiant Energy System Synoptic (SYN1deg), edition 3, product provides climate-quality global 3-hourly 1° × 1°gridded top of atmosphere, in-atmosphere, and surface radiant fluxes. The in-atmosphere surface fluxes are computed hourly using a radiative transfer code based upon inputs from Terra and Aqua Moderate Resolution Imaging Spectroradiometer (MODIS), 3-hourly geostationary (GEO) data, and meteorological assimilation data from the Goddard Earth Observing System. The GEO visible and infrared imager calibration is tied to MODIS to ensure uniform MODIS-like cloud properties across all satellite cloud datasets. Computed surface radiant fluxes are compared to surface observations at 85 globally distributed land (37) and ocean buoy (48) sites as well as several other publicly available global surface radiant flux data products. Computed monthly mean downward fluxes from SYN1deg have a bias (standard deviation) of 3.0 W m−2 (5.7%) for shortwave and −4.0 W m−2 (2.9%) for longwave compared to surface observations. The standard deviation between surface downward shortwave flux calculations and observations at the 3-hourly time scale is reduced when the diurnal cycle of cloud changes is explicitly accounted for. The improvement is smaller for surface downward longwave flux owing to an additional sensitivity to boundary layer temperature/humidity, which has a weaker diurnal cycle compared to clouds.

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Journal of Atmospheric and Oceanic Technology

Tập 32 Số 6

1121-1143

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