Abstract
Abstract. Measuring spectral aerosol absorption remains a challenging task in aerosol studies, especially in the UV region, where ground and airborne measurements are sparse. In this paper, we introduce an algorithm that synergizes ground measurements with satellite observations for the derivation of spectral single scattering albedo (SSA, ωo) of aerosols in the UV-to-visible wavelength range (340–670 nm). The approach consists in explaining satellite-measured near-UV radiances (340, 354, 388 nm) by the Ozone Monitoring Instrument (OMI) and visible radiances
(466, 646 nm) by the Moderate Resolution Imaging Spectroradiometer (MODIS), given the
collocated ground-based Aerosol Robotic Network (AERONET) measurements of
total column extinction aerosol optical depth (AOD, τ), in terms of
retrieved total column wavelength-dependent SSA using radiative transfer
calculations. Required information on aerosol particle size distribution is
adopted from AERONET-based aerosol type-dependent seasonal climatologies
specifically developed for this project. The inversion procedure is applied
to about 110 AERONET sites distributed worldwide, for which continuous,
long-term AERONET measurements are available. Using the derived data set, we present seasonal and regional climatology of ωo(λ) for carbonaceous, dust, and urban/industrial aerosols. The resulting UV–visible
spectral dependence of ωo obtained for these three major
aerosol types is found to be both qualitatively and quantitatively
consistent with independent measurements reported in the literature. A
comparison to standard AERONET SSA product at 440 nm shows absolute
differences within 0.03 (0.05) for 40 % (65 %) of the compared
observations. The derived aerosol ωo(λ) data set
provides a valuable addition to the existing aerosol absorption record from
AERONET by extending it to the near-UV region. Furthermore, SSA retrievals
from our method at visible wavelengths and around satellite overpass time
also complement the equivalent inversion available during early
morning/late afternoon from AERONET. In addition to improving our understanding of spectral aerosol absorption properties, the combined
UV–visible data set also offers wavelength-dependent dynamic aerosol absorption models for use in the satellite-based aerosol retrieval algorithms.
Funder
National Aeronautics and Space Administration
Cited by
6 articles.
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