Article

Absorption of Solar Radiation by the Cloudy Atmosphere Interpretations of Collocated Aircraft Measurements

01/1998;
Source: NTRS

ABSTRACT As part of the Atmospheric Radiation Measurement (ARM) Enhanced Shortwave Experiment (ARESE), we have obtained and analyzed measurements made from collocated aircraft of the absorption of solar radiation within the atmospheric column between the two aircraft. The measurements were taken during October 1995 at the ARM site in Oklahoma. Relative to a theoretical radiative transfer model, we find no evidence for excess solar absorption in the clear atmosphere and significant evidence for its existence in the cloudy atmosphere. This excess cloud solar absorption appears to occur in both visible (0.224-0.68 microns) and near-infrared (0.68-3.30 microns) spectral regions, although not at 0.5 microns for the visible contribution, and it is shown to be true absorption rather than an artifact of sampling errors caused by measuring three-dimensional clouds.

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Keywords

absorption
 
ARM site
 
atmospheric column
 
Atmospheric Radiation Measurement
 
clear atmosphere
 
cloudy atmosphere
 
excess cloud solar absorption
 
excess solar absorption
 
near-infrared
 
solar radiation
 
theoretical radiative transfer model
 
true absorption
 
two aircraft
 
visible
 
visible contribution