Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-18-635-2018 |
Exploring the observational constraints on the simulation of brown carbon | |
Wang, Xuan1,8; Heald, Colette L.1,2; Liu, Jiumeng3; Weber, Rodney J.4; Campuzano-Jost, Pedro5,6; Jimenez, Jose L.5,6; Schwarz, Joshua P.7; Perring, Anne E.6,7 | |
2018-01-19 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:2页码:635-653 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Organic aerosols (OA) that strongly absorb solar radiation in the near-UV are referred to as brown carbon (BrC). The sources, evolution, and optical properties of BrC remain highly uncertain and contribute significantly to uncertainty in the estimate of the global direct radiative effect (DRE) of aerosols. Previous modeling studies of BrC optical properties and DRE have been unable to fully evaluate model performance due to the lack of direct measurements of BrC absorption. In this study, we develop a global model simulation (GEOS-Chem) of BrC and test it against BrC absorption measurements from two aircraft campaigns in the continental US (SEAC(4)RS and DC3). To the best of our knowledge, this is the first study to compare simulated BrC absorption with direct aircraft measurements. We show that BrC absorption properties estimated based on previous laboratory measurements agree with the aircraft measurements of freshly emitted BrC absorption but overestimate aged BrC absorption. In addition, applying a photochemical scheme to simulate bleaching/degradation of BrC improves model skill. The airborne observations are therefore consistent with a mass absorption coefficient (MAC) of freshly emitted biomass burning OA of 1.33 m(2) g(-1) at 365 nm coupled with a 1-day whitening e-folding time. Using the GEOS-Chem chemical transport model integrated with the RRTMG radiative trans-fer model, we estimate that the top-of-the-atmosphere allsky direct radiative effect (DRE) of OA is 0.344 Wm-(2), 10% higher than that without consideration of BrC absorption. Therefore, our best estimate of the absorption DRE of BrC is C 0.048 Wm-(2). We suggest that the DRE of BrC has been overestimated previously due to the lack of observational constraints from direct measurements and omission of the effects of photochemical whitening. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000423020400002 |
WOS关键词 | SECONDARY ORGANIC AEROSOL ; ABSORPTION ANGSTROM EXPONENT ; GLOBAL FIRE EMISSIONS ; BIOMASS-BURNING SMOKE ; LIGHT-ABSORPTION ; BLACK CARBON ; OPTICAL-PROPERTIES ; HIGH-RESOLUTION ; MIXING STATE ; MASS |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/28393 |
专题 | 地球科学 |
作者单位 | 1.MIT, Dept Civil & Environm Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA; 2.MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA USA; 3.Pacific Northwest Natl Lab, Atmospher Sci & Global Change Div, Richland, WA USA; 4.Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA; 5.Univ Colorado, Dept Chem, Boulder, CO 80309 USA; 6.Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA; 7.Natl Ocean & Atmospher Adm, Earth Syst Res Lab, Chem Sci Div, Boulder, CO USA; 8.Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA |
推荐引用方式 GB/T 7714 | Wang, Xuan,Heald, Colette L.,Liu, Jiumeng,et al. Exploring the observational constraints on the simulation of brown carbon[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(2):635-653. |
APA | Wang, Xuan.,Heald, Colette L..,Liu, Jiumeng.,Weber, Rodney J..,Campuzano-Jost, Pedro.,...&Perring, Anne E..(2018).Exploring the observational constraints on the simulation of brown carbon.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(2),635-653. |
MLA | Wang, Xuan,et al."Exploring the observational constraints on the simulation of brown carbon".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.2(2018):635-653. |
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