Direct wind measurements of Saharan dust events from Terra and Aqua satellites

Details Direct wind measurements of Saharan dust events from Terra and Aqua satellites Direct wind measurements of Saharan dust events from Terra and Aqua satellites

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3106122k&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 6, CiteID L06122

Mathematics

Logic

13

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801), Meteorology And Atmospheric Dynamics: Boundary Layer Processes, Meteorology And Atmospheric Dynamics: Land/Atmosphere Interactions, Meteorology And Atmospheric Dynamics: Numerical Modeling And Data Assimilation, Meteorology And Atmospheric Dynamics: Remote Sensing

Scientific paper

Wind speed and direction, during Saharan dust episodes are calculated by estimating the movement of the dust plume between the morning observations from Terra and the afternoon observations from Aqua by the MODerate resolution Imaging Spectroradiometer (MODIS). The difference in the position of the dust front (easily identified both near the dust sources and over the ocean) between the Terra and Aqua observations is used to derive the actual wind field of the dust layer. The analysis is used to estimate the near-surface wind properties needed for dust mobilization in the Bodele depression. Comparison with NCEP reanalysis winds shows that NCEP underestimated by factor 2 the actual speed of the dust front progression near the sources and produced an azimuthal spread, three times wider than the measured one. Over the seashore, with more numerous meteorological observations, the NCEP wind field did match very well the dust measurements.

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