Broadband water vapor absorption of solar radiation tested using ARM data

Details Broadband water vapor absorption of solar radiation tested using ARM data Broadband water vapor absorption of solar radiation tested using ARM data

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.1169f&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 8, p. 1169-1172

Physics

10

Meteorology And Atmospheric Dynamics: Radiative Processes, Atmospheric Composition And Structure: Transmission And Scattering Of Radiation, Atmospheric Composition And Structure: Aerosols And Particles

Scientific paper

A high quality data set collected at the ARM SGP central facility is analyzed to identify the water vapor-related anomalous absorption of solar radiation. We focus on the direct solar broadband surface irradiances under cloud-free conditions in the April 1994 CAGEX and summer 1996 periods. A radiation model without including the H2O continuum in the solar spectrum is compared with observations. This comparison reveals a mean bias of 4.5Wm-2 that is roughly equivalent to a globally averaged bias of ~2Wm-2. It is therefore unlikely that the excess absorption suggested by recent studies can be attributed to the H2O continuum. We also show that the difference between calculated and observed irradiances has a very weak correlation with water vapor. It is suggested that the discrepancy between model and observations is largely due to the uncertainties associated with aerosol optical properties.

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