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Simultaneous detection/separation of mineral dust and cirrus clouds using MODIS thermal infrared window data
Author(s) -
Hansell R. A.,
Ou S. C.,
Liou K. N.,
Roskovensky J. K.,
Tsay S. C.,
Hsu C.,
Ji Q.
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl029388
Subject(s) - cirrus , mineral dust , thermal infrared , infrared , environmental science , window (computing) , remote sensing , atmospheric sciences , geology , meteorology , aerosol , optics , physics , computer science , operating system
An integrated method for the simultaneous detection/separation of mineral dust and clouds for both daytime and nighttime conditions using MODIS thermal infrared window brightness temperature data has been developed. Based on the spectral variability of dust emissivity at 3.75, 8.6, 11 and 12 μ m wavelengths, we combine three heritage approaches to identify dust and cirrus. MODIS data for three dust‐laden scenes have been analyzed to demonstrate the effectiveness of this detection/separation method. The detected daytime dust and cloud coverage for the Persian Gulf case compares reasonably well to those from the “Deep Blue” algorithm developed at NASA‐GSFC. Validation of the nighttime dust and cloud detection method has been carried out by using the cases surrounding Cape Verde and Niger, West Africa, on the basis of the coincident and collocated ground‐based micro‐pulse lidar measurements.