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| Titel |
Aerosol optical properties measurement by recently developed cavity-enhanced aerosol single scattering albedometer |
| VerfasserIn |
Weixiong Zhao, Xuezhe Xu, Qilei Zhang, Bo Fang, Xiaodong Qian, Weidong Chen, Xiaoming Gao, Weijun Zhang |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250103130
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| Publikation (Nr.) |
 EGU/EGU2015-2529.pdf |
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| Zusammenfassung |
| Development of appropriate and well-adapted measurement technologies for real-time in-situ
measurement of aerosol optical properties is an important step towards a more accurate and
quantitative understanding of aerosol impacts on climate and the environment. Aerosol single
scattering albedo (SSA, Ï), the ratio between the scattering (αscat) and extinction (αext)
coefficients, is an important optical parameter that governs the relative strength of the aerosol
scattering and absorption capacity. Since the aerosol extinction coefficient is the sum of the
absorption and scattering coefficients, a commonly used method for the determination of SSA
is to separately measure two of the three optical parameters – absorption, scattering
and extinction coefficients – with different instruments. However, as this method
involves still different instruments for separate measurements of extinction and
absorption coefficients under different sampling conditions, it might cause potential
errors in the determination of SSA value, because aerosol optical properties are
very sensitive to the sampling conditions such as temperature and relative humidity
(RH).
In this paper, we report on the development of a cavity-enhanced aerosol single scattering
albedometer incorporating incoherent broad-band cavity-enhanced spectroscopy (IBBCEAS)
and an integrating sphere (IS) for direct in-situ measurement of aerosol scattering and
extinction coefficients on the exact same sample volume. The cavity-enhanced albedometer
holds great promise for high-sensitivity and high-precision measurement of ambient aerosol
scattering and extinction coefficients (hence absorption coefficient and SSA determination)
and for absorbing trace gas concentration. In addition, simultaneous measurements of
aerosol scattering and extinction coefficients enable a potential application for the
retrieval of particle number size distribution and for faster retrieval of aerosols’
complex RI. The albedometer was deployed to characterize the aerosol optical
properties in the Haze Observation Project Especially for Jing-Jin-Ji Area (HOPE-J3A)
during Nov. 2014 - Jan. 2015 and the primary measurement results will be presented. |
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