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DOI | 10.1029/2018JD028504 |
Characterization of the Real Part of Dry Aerosol Refractive Index Over North America From the Surface to 12km | |
Aldhaif, Abdulmonam M.1; Stahl, Connor1; Braun, Rachel A.1; Moghaddam, Mohammad A.2; Shingler, Taylor3,4; Crosbie, Ewan3,4; Sawamura, Patricia3,4; Dadashazar, Hossein1; Ziemba, Luke4; Jimenez, Jose L.5,6; Campuzano-Jost, Pedro5,6; Sorooshian, Armin1,2 | |
2018-08-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2018 |
卷号 | 123期号:15页码:8283-8300 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | This study reports a characterization of the real part of dry particle refractive index (n) at 532nm based on airborne measurements over the United States, Canada, the Pacific Ocean, and the Gulf of Mexico from the 2012 Deep Convective Clouds and Chemistry (DC3) and 2013 Studies of Emissions and Atmospheric Composition, Clouds and Climate Coupling by Regional Surveys (SEAC(4)RS) campaigns. Effective n values are reported, with the limitations and uncertainties discussed. Eight air mass types were identified based on criteria related to gas-phase tracer concentrations, location, and altitude. Average values of n for these air types ranged from 1.50 to 1.53. Values of n for the organic aerosol (OA) fraction (n(OA)) were calculated using a linear mixing rule for each air mass type, with 1.52 shown to be a good approximation for all OA. Case studies detailing vertical structure revealed that n and n(OA) increased with altitude, simultaneous with enhancements in the mass fraction of OA. Values of n(OA) were positively (negatively) correlated with the O:C (H:C) ratio in the absence of biomass burning influence; in contrast, the cumulative data set revealed a slight decrease in n(OA) as a function of the O:C ratio. The performance of parametric (multiple linear regression) and nonparametric (Gaussian process regression) methods in predicting n based on aerosol composition data is discussed. It is shown that even small perturbations in n values significantly impact aerosol optical depth retrievals, radiative forcing, and optical sizing instruments, emphasizing the importance of further improving the understanding of this important aerosol property. |
英文关键词 | aerosol refractive index radiative forcing aerosol optical depth SEAC(4)RS DC3 |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000443566900027 |
WOS关键词 | SECONDARY ORGANIC AEROSOL ; SINGLE-SCATTERING ALBEDO ; OPTICAL-PROPERTIES ; HYGROSCOPIC GROWTH ; AIRBORNE MEASUREMENTS ; CHEMICAL-COMPOSITION ; VERTICAL STRUCTURE ; ALPHA-PINENE ; IN-SITU ; DASH-SP |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | 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/33596 |
专题 | 气候变化 |
作者单位 | 1.Univ Arizona, Dept Chem & Environm Engn, Tucson, AZ 85721 USA; 2.Univ Arizona, Dept Hydrol & Atmospher Sci, Tucson, AZ 85721 USA; 3.Sci Syst & Applicat Inc, Hampton, VA USA; 4.NASA, Langley Res Ctr, Hampton, VA 23665 USA; 5.Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA; 6.Univ Colorado, Dept Chem & Biochem, Campus Box 215, Boulder, CO 80309 USA |
推荐引用方式 GB/T 7714 | Aldhaif, Abdulmonam M.,Stahl, Connor,Braun, Rachel A.,et al. Characterization of the Real Part of Dry Aerosol Refractive Index Over North America From the Surface to 12km[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(15):8283-8300. |
APA | Aldhaif, Abdulmonam M..,Stahl, Connor.,Braun, Rachel A..,Moghaddam, Mohammad A..,Shingler, Taylor.,...&Sorooshian, Armin.(2018).Characterization of the Real Part of Dry Aerosol Refractive Index Over North America From the Surface to 12km.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(15),8283-8300. |
MLA | Aldhaif, Abdulmonam M.,et al."Characterization of the Real Part of Dry Aerosol Refractive Index Over North America From the Surface to 12km".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.15(2018):8283-8300. |
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