Comparison of Saharan dust aerosol optical depths retrieved using aircraft mounted pyranometers and 2-channel AVHRR algorithms

Details Comparison of Saharan dust aerosol optical depths retrieved using aircraft mounted pyranometers and 2-channel AVHRR algorithms Comparison of Saharan dust aerosol optical depths retrieved using aircraft mounted pyranometers and 2-channel AVHRR algorithms

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2393h&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 12, p. 2393-2396

Physics

18

Atmospheric Composition And Structure: Aerosols And Particles, Meteorology And Atmospheric Dynamics: Radiative Processes, Meteorology And Atmospheric Dynamics: Remote Sensing

Scientific paper

The 0.55 μm optical depth of the Saharan dust aerosol plume is determined from C-130 pyranometer data for two different days and the results compared to those from a 2-channel Advanced Very High Resolution Radiometer (AVHRR) retrieval algorithm. When the time difference between the C-130 and AVHRR overpasses is small, the geographic distribution of the aerosol optical depths are similar and differ by less than +/- 0.1 despite the different refractive indices, size distributions and atmospheric profiles implicit in each method. The pyranometer derived optical depth at 0.55 μm exceeds a value of 1 on one of the days, which exceeds the cloud threshold used in many satellite retrieval algorithms with implications for the accuracy of satellite derived aerosol optical depths. The difficulties in making extensive geographical comparisons between satellite and aircraft measurements owing to the differential speed of the observing platforms are also highlighted.

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