Identifying the regional thermal-IR radiative signature of mineral dust with MODIS

Details Identifying the regional thermal-IR radiative signature of mineral dust with MODIS Identifying the regional thermal-IR radiative signature of mineral dust with MODIS

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3216803d&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 16, CiteID L16803

Mathematics

Logic

7

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Instruments And Techniques, Atmospheric Processes: Remote Sensing

Scientific paper

We use MODIS Terra Level 1B data containing calibrated and geolocated radiances to investigate a regional signature of wind-blown mineral dust in the thermal-IR. MODIS data over oceans for the 2000-2004 time period were examined for the presence of dust plumes that originate from the main dust sources located in East and South Asia, Middle East, Northern Africa, and Australia. A number of representative cases for different source regions were selected and analyzed in terms of brightness temperatures at three IR channels centered at 8.55, 11.03, and 12.02 μm. The distinct differences in the thermal-IR signature of atmospheric dust for the considered regions were found. Our analysis indicates that these differences are likely due to different mineralogical composition, although other factors (e.g., multilayered vertical distribution) may be also involved. Implications of our findings to the detection of dust based on the techniques using brightness temperature differences are discussed.

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