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| Titel |
Optical Properties of Aerosol Types from Satellite and Ground-based Observations |
| VerfasserIn |
Tang-Huang Lin, Gin-Rong Liu, Chian-Yi Liu |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250096164
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| Publikation (Nr.) |
 EGU/EGU2014-11658.pdf |
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| Zusammenfassung |
| In this study, the properties of aerosol types are characterized from the aspects of remote
sensing and in situ measurements. Particles of dust, smoke and anthropogenic pollutant are
selected as the principal types in the study. The measurements of AERONET sites and
MODIS data, during the dust storm and biomass burning events in the period from 2002 to
2008, suggest that the aerosol species can be discriminated sufficiently based on the
dissimilarity of AE (Ångström exponent) and SSA (single scattering albedo) properties.
However, the physicochemical characteristics of source aerosols can be altered after the
external/internal combination along the pathway of transportation, thus induce error to
the satellite retrievals. In order to eliminate from this kind of errors, the optical
properties of mixed aerosols (external) are also simulated with the database of dust and
soot aggregates in this study. The preliminary results show that SSA value (at 470
nm) of mineral dust may decay 5-11 % when external mixed with 15-30 % soot
aggregates, then result in 11-22 % variation of reflectance observed from satellite
which could lead to sufficiently large uncertainty on the retrieval of aerosol optical
thickness. As a result, the effect of heterogeneous mixture should be taken into account
for more accurate retrieval of aerosol properties, especially after the long-range
transport.
Keywords: Aerosol type, Ångström exponent, Single scattering albedo, AERONET,
MODIS, External mixture |
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