Validating MODIS above-cloud aerosol optical depth retrieved from “color ratio” algorithm using direct measurements made by NASA's airborne AATS and 4STAR sensors
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2016
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Abstract
We present the validation analysis of above-cloud aerosol optical depth
(ACAOD) retrieved from the “color ratio” method applied to MODIS cloudy-sky
reflectance measurements using the limited direct measurements made by NASA's
airborne Ames Airborne Tracking Sunphotometer (AATS) and Spectrometer for
Sky-Scanning, Sun-Tracking Atmospheric Research (4STAR) sensors. A thorough search of the airborne database
collection revealed a total of five significant events in which an airborne
sun photometer, coincident with the MODIS overpass, observed partially
absorbing aerosols emitted from agricultural biomass burning, dust, and
wildfires over a low-level cloud deck during SAFARI-2000, ACE-ASIA 2001, and
SEAC4RS 2013 campaigns, respectively. The co-located satellite-airborne
matchups revealed a good agreement (root-mean-square difference < 0.1), with most
matchups falling within the estimated uncertainties associated the MODIS
retrievals (about −10 to +50 %). The co-retrieved cloud optical depth was
comparable to that of the MODIS operational cloud product for ACE-ASIA and
SEAC4RS, however, higher by 30–50 % for the SAFARI-2000 case study. The
reason for this discrepancy could be attributed to the distinct aerosol
optical properties encountered during respective campaigns. A brief
discussion on the sources of uncertainty in the satellite-based ACAOD
retrieval and co-location procedure is presented. Field experiments dedicated
to making direct measurements of aerosols above cloud are needed for the
extensive validation of satellite-based retrievals.
| Reference Key |
jethva2016validatingatmospheric
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|---|---|
| Authors | Jethva, H.;Torres, O.;Remer, L.;Redemann, J.;Livingston, J.;Dunagan, S.;Shinozuka, Y.;Kacenelenbogen, M.;Rosenheimer, M. S.;Spurr, R.; |
| Journal | atmospheric measurement techniques |
| Year | 2016 |
| DOI |
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| URL | |
| Keywords | Keywords not found |
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