Downward atmospheric longwave irradiance under clear and cloudy skies: Measurement and parameterization

Details Downward atmospheric longwave irradiance under clear and cloudy skies: Measurement and parameterization Downward atmospheric longwave irradiance under clear and cloudy skies: Measurement and parameterization

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jastp..65.1107i&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 65, Issue 10, p. 1107-1116.

Physics

31

Downward Atmospheric Radiation Models, Lowland, Mountain, Reklip, Arm, Sky Conditions

Scientific paper

This paper evaluates models for the estimation of downward longwave atmospheric irradiance at a lowland location and a mountain location under clear and cloudy skies. The multiyear (1992-1995) data sets utilized for the study were recorded in southwest Germany during the REgio KLIma Projekt (REKLIP). Annual mean of downward atmospheric irradiance Ø↓ ranged from 315 to 328Wm-2 at the lowland site and from 282 to 290Wm-2 at the mountain site. Inter-annual variability of Ø↓ at the sites was less than 2%. Six existing downward longwave clear-sky irradiance models were assessed in this study. In addition, this study proposes a new parameterization for estimating downward longwave clear-sky irradiance at the surface. The new parameterization, which is validated with data from the Oklahoma-based U.S. Department of Energy Atmospheric Radiation Measurement (ARM) program, performed better than the other six models. It produced estimates, which agree with measurements more closely (within 5% for lowland and 7% for mountain locations). The incorporation of quadratic cloud terms in the parameterization allows for the estimation of Ø↓ under variable sky conditions.

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