气候变化领域集成服务门户(CCPortal): Modelling black carbon absorption of solar radiation: Combining external and internal mixing assumptions

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DOI	10.5194/acp-19-181-2019
	Modelling black carbon absorption of solar radiation: Combining external and internal mixing assumptions
	Curci G.; Alyuz U.; Barò R.; Bianconi R.; Bieser J.; H. Christensen J.; Colette A.; Farrow A.; Francis X.; Jiménez-Guerrero P.; Im U.; Liu P.; Manders A.; Palacios-Peña L.; Prank M.; Pozzoli L.; Sokhi R.; Solazzo E.; Tuccella P.; Unal A.; Vivanco M.G.; Hogrefe C.; Galmarini S.
发表日期	2019
ISSN	16807316
起始页码	181
结束页码	204
卷号	19 期号:1
英文摘要	An accurate simulation of the absorption properties is key for assessing the radiative effects of aerosol on meteorology and climate. The representation of how chemical species are mixed inside the particles (the mixing state) is one of the major uncertainty factors in the assessment of these effects. Here we compare aerosol optical properties simulations over Europe and North America, coordinated in the framework of the third phase of the Air Quality Model Evaluation International Initiative (AQMEII), to 1 year of AERONET sunphotometer retrievals, in an attempt to identify a mixing state representation that better reproduces the observed single scattering albedo and its spectral variation. We use a single post-processing tool (FlexAOD) to derive aerosol optical properties from simulated aerosol speciation profiles, and focus on the absorption enhancement of black carbon when it is internally mixed with more scattering material, discarding from the analysis scenes dominated by dust. We found that the single scattering albedo at 440 nm (‰0,440) is on average overestimated (underestimated) by 3-5 % when external (core-shell internal) mixing of particles is assumed, a bias comparable in magnitude with the typical variability of the quantity. The (unphysical) homogeneous internal mixing assumption underestimates ‰0,440 by ĝ1/414 %. The combination of external and core-shell configurations (partial internal mixing), parameterized using a simplified function of air mass aging, reduces the ‰0,440 bias to $- 1 / - 3$ %. The black carbon absorption enhancement (Eabs) in core-shell with respect to the externally mixed state is in the range 1.8-2.5, which is above the currently most accepted upper limit of ĝ1/41.5. The partial internal mixing reduces Eabs to values more consistent with this limit. However, the spectral dependence of the absorption is not well reproduced, and the absorption Ångström exponent AAE $_{675}^{440}$ is overestimated by 70-120 %. Further testing against more comprehensive campaign data, including a full characterization of the aerosol profile in terms of chemical speciation, mixing state, and related optical properties, would help in putting a better constraint on these calculations. © 2019 Copernicus. All rights reserved.
语种	英语
scopus关键词	absorption; accuracy assessment; black carbon; climate modeling; computer simulation; numerical model; radiative forcing; solar radiation; Europe; North America
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144740
作者单位	Department of Physical and Chemical Sciences, University of l'Aquila, L'Aquila, Italy; Center of Excellence in Telesening of Environment and Model Prediction of Severe Events (CETEMPS), University of l'Aquila, L'Aquila (AQ), Italy; Eurasia Institute of Earth Sciences, Istanbul Technical University, Istanbul, 34469, Turkey; Department of Physics, University of Murcia, Murcia, 30003, Spain; Enviroware S.r.l., Concorezzo (MB), 20863, Italy; Helmholtz-Zentrum Geesthacht, Zentrum für Material- und Küstenforschung GmbH, Geesthacht, 21502, Germany; Atmospheric Modelling Secton (ATMO), Department of Environmental Science, Aarhus University, Frederiksborgvej 399, Roskilde, 4000, Denmark; Atmospheric Modelling and Environmental Mapping Unit, INERIS, BP2, Verneuil-en-Halatte, 60550, France; Centre for Atmospheric and Instrumentation Research (CAIR), University of Hertfordshire College Lane, Hatfield, AL10 9AB, United Kingdom; NRC Research Associate at Computational Exposure Division, National Exposure Research Labor...
推荐引用方式 GB/T 7714	Curci G.,Alyuz U.,Barò R.,et al. Modelling black carbon absorption of solar radiation: Combining external and internal mixing assumptions[J],2019,19(1).
APA	Curci G..,Alyuz U..,Barò R..,Bianconi R..,Bieser J..,...&Galmarini S..(2019).Modelling black carbon absorption of solar radiation: Combining external and internal mixing assumptions.Atmospheric Chemistry and Physics,19(1).
MLA	Curci G.,et al."Modelling black carbon absorption of solar radiation: Combining external and internal mixing assumptions".Atmospheric Chemistry and Physics 19.1(2019).