An infrared desert dust index for the Along-Track Scanning Radiometers
作者： E.J. Good , X. Kong , O. Embury , C.J. Merchant , J.J. Remedios
DOI: 10.1016/J.RSE.2010.06.016
关键词: Brightness temperature 、 Aerosol 、 Atmospheric radiative transfer codes 、 Mineral dust 、 Atmospheric sciences 、 Remote sensing 、 Sea surface temperature 、 AATSR 、 Radiometer 、 Nadir 、 Environmental science
摘要: A new aerosol index for the Along-Track Scanning Radiometers (ATSRs) is presented that provides a means to detect desert dust contamination in infrared SST retrievals. The ATSR Saharan (ASDI) utilises only thermal channels and may therefore be applied consistently entire data record (1991 present), both day time night observations. derivation of ASDI based on principal component (PC) analysis (PCA) two unique pairs channel brightness temperature differences (BTDs). In 2-D space (i.e. BTD vs BTD), it found loci unaffected by are confined single axis variability. contrast, aerosol-contaminated fall off-axis, shifting direction approximately orthogonal clear-sky axis. defined second PC, where first PC accounts primary nadir forward-view observations at 11 12 μm (ASDI2). secondary, three-channel nadir-only (ASDI3) also situations from forward view not available. Empirical theoretical analyses suggest well correlated with optical depth (AOD: correlation r typically > 0.7) an effective tool detecting mineral dust. Overall, ASDI2 more than ASDI3, latter being sensitive very high loading. addition, use ASDI3 as relies 3.7 channel, which reflected solar radiation. This highlights benefits having nadir- this particular approach detection.
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