Publication Date:
2011-08-16
Description:
Infrared in situ radiance observations at 8.0 to 14 microns and 9.5 to 11.5 microns of the West African Harmattan haze during the 1974 Global Atmospheric Research Project Atlantic Tropical Experiment field phase made possible the determination of some of the radiative properties of this tropospheric phenomenon. This in turn permitted development of a simple calculation model for radiative transfer through the haze. Radiometric observations of the dust haze, reaching from 600 m to 6.25 km, were analyzed for haze IR transmission. A transfer model incorporating these transmission properties gave an average calculated IR cooling rate of 0.09 C/h for the entire haze layer as compared to a haze-free cloudless-troposphere cooling rate of 0.06 C/h for the same levels. The haze volume-absorption coefficient was approximately 0.042/km for layers of all depths. This uniformity of the haze transmission was further evident in the direct correlation of its transmission and optical depth.
Keywords:
METEOROLOGY AND CLIMATOLOGY
Type:
Journal of Geophysical Research; 80; Aug. 20
Format:
text
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