globalchange  > 科学计划与规划
DOI: 10.1002/2016GL069786
The interplay between assumed morphology and the direct radiative effect of light-absorbing organic aerosol
Author: Saleh R.; Adams P.J.; Donahue N.M.; Robinson A.L.
Source Publication: Geophysical Research Letters
ISSN: 0094-8743
EISSN: 1944-8474
Publishing Year: 2016
Volume: 43, Issue:16
pages begin: 8735
pages end: 8743
Language: 英语
Keyword: brown carbon ; DRE ; light-absorbing OA ; morphology ; radiative transfer
Scopus Keyword: Aerosols ; Radiative transfer ; Brown carbons ; Complex morphology ; Numerical experiments ; Optical behavior ; Parametrizations ; Radiative effects ; Radiative transfer model ; Top of the atmospheres ; Morphology
English Abstract: Mie theory is widely employed in aerosol top-of-the-atmosphere direct radiative effect (DRE) calculations and to retrieve the absorptivity of light-absorbing organic aerosol (OA) from measurements. However, when OA is internally mixed with black carbon, it may exhibit complex morphologies whose optical behavior is imperfectly predicted by Mie theory, introducing bias in the retrieved absorptivities. We performed numerical experiments and global radiative transfer modeling (RTM) to investigate the effect of this bias on the calculated absorption and thus the DRE. We show that using true OA absorptivity, retrieved with a realistic representation of the complex morphology, leads to significant errors in DRE when the RTM employs the simplified Mie theory. On the other hand, when Mie theory is consistently applied in both OA absorptivity retrieval and the RTM, the errors largely cancel out, yielding accurate DRE. As long as global RTMs use Mie theory, they should implement parametrizations of light-absorbing OA derived from retrievals based on Mie theory. ©2016. American Geophysical Union. All Rights Reserved.
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Document Type: 期刊论文
Appears in Collections:科学计划与规划

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Affiliation: Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, PA, United States

Recommended Citation:
Saleh R.,Adams P.J.,Donahue N.M.,et al. The interplay between assumed morphology and the direct radiative effect of light-absorbing organic aerosol[J]. Geophysical Research Letters,2016-01-01,43(16).
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