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| Titel |
Multi-angle Polarized Remote Sensing of Non-Spherical Aerosol Particles |
| VerfasserIn |
Tianhai Cheng, Xingfa Gu, Donghai Xie, Hao Chen, Jing Guo |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250050118
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| Zusammenfassung |
| Aerosol particles in the atmosphere are known to play an important role in the climate system
by altering the earth’s energy budget through the scattering and absorption of radiation.
Aerosol has been known to be a source of significant uncertainties in studies of earth’s
climate, which is explained by difficulties in monitoring spatially- and temporally-variable
aerosol properties. The only way to obtain the aerosol particles properties on a global scale is
by means of satellite remote sensing. Several approaches to the satellite remote sensing of
aerosol particles optical and microphysical properties using measurements of solar
reflectance have been developed. Despite this multitude of approaches, the AOD retrieval
from satellite data is still not satisfactory. The accuracy of remote sensing aerosol
characterization is limited by the difficulty to model the optical properties of non-spherical
aerosol particles.
Earlier on, and in some applications even today, aerosol particles have been assumed to be
isotropic, homogeneous, and spherical. With these assumptions one can apply the Mie theory
and compute the exact single-scattering properties of aerosol particles. There is sufficient
experimental evidence that the non-spherical of aerosol particles can cause scattering
properties significantly different from those predicted by the Mie theory. Many research
efforts have focused on the improving the accuracy of aerosol retrievals in the presence of
non-spherical particles. However, dealing with non-sphericity is not a completely resolved
issue.
In this paper, the microphysical and optical properties of non-spherical aerosol particles
are studied, and the vector radiative transfer model coupling the BRDF model and BPDF
model of surface reflectance was used study the TOA reflectance and polarized reflectance of
non-spherical aerosol. The sensitivity of reflectance and polarized reflectance to
non-spherical aerosol particles microphysical optical parameters are evaluated. Based on the
studies of the sensitivity, the basic theory of using the remote sensing data of multi-angular
polarized to retrieve the shapes of non-spherical aerosol particles is proposed. The conceptual
aerosol retrieval was applied using the multi-angle polarized remote sensing data. |
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