气候变化领域集成服务门户(CCPortal): Examination of brown carbon absorption from wildfires in the western US during the WE-CAN study

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DOI	10.5194/acp-22-13389-2022
	Examination of brown carbon absorption from wildfires in the western US during the WE-CAN study
	Sullivan, Amy P.; Pokhrel, Rudra P.; Shen, Yingjie; Murphy, Shane M.; Toohey, Darin W.; Campos, Teresa; Lindaas, Jakob; Fischer, Emily, V; Collett, Jeffrey L., Jr.
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	13389
结束页码	13406
卷号	22 期号:20 页码:18
英文摘要	Light absorbing organic carbon, or brown carbon (BrC), can be a significant contributor to the visible light absorption budget. However, the sources of BrC and the contributions of BrC to light absorption are not well understood. Biomass burning is thought to be a major source of BrC. Therefore, as part of the WE-CAN (Western Wildfire Experiment for Cloud Chemistry, Aerosol Absorption and Nitrogen) study, BrC absorption data were collected on board the National Science Foundation/National Center for Atmospheric Research (NSF/NCAR) C-130 aircraft as it intercepted smoke from wildfires in the western US in July-August 2018. BrC absorption measurements were obtained in near real-time using two techniques. The first coupled a particle-into-liquid sampler (PILS) with a liquid waveguide capillary cell and a total organic carbon analyzer for measurements of water-soluble BrC absorption and WSOC (water-soluble organic carbon). The second employed a custom-built photoacoustic aerosol absorption spectrometer (PAS) to measure total absorption at 405 and 660 nm. The PAS BrC absorption at 405 nm (PAS total Abs 405 BrC) was calculated by assuming the absorption determined by the PAS at 660 nm was equivalent to the black carbon (BC) absorption and the BC aerosol absorption Angstrom exponent was 1. Data from the PILS and PAS were combined to investigate the water-soluble vs. total BrC absorption at 405 nm in the various wildfire plumes sampled during WE-CAN. WSOC, PILS water-soluble Abs 405, and PAS total Abs 405 tracked each other in and out of the smoke plumes. BrC absorption was correlated with WSOC (R-2 value for PAS = 0.42 and PILS = 0.60) and CO (carbon monoxide) (R-2 value for PAS = 0.76 and PILS = 0.55) for all wildfires sampled. The PILS water-soluble Abs 405 was corrected for the non-water-soluble fraction of the aerosol using the calculated UHSAS (ultra-high-sensitivity aerosol spectrometer) aerosol mass. The corrected PILS water-soluble Abs 405 showed good closure with the PAS total Abs 405 BrC with a factor of similar to 1.5 to 2 difference. This difference was explained by particle vs. bulk solution absorption measured by the PAS vs. PILS, respectively, and confirmed by Mie theory calculations. During WE-CAN, similar to 45 % (ranging from 31 % to 65 %) of the BrC absorption was observed to be due to water-soluble species. The ratio of BrC absorption to WSOC or ACO showed no clear dependence on fire dynamics or the time since emission over 9 h.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000869043300001
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/273102
作者单位	Colorado State University; University of Wyoming; University of Colorado System; University of Colorado Boulder; National Center Atmospheric Research (NCAR) - USA; University of Colorado System; University of Colorado Boulder; National Oceanic Atmospheric Admin (NOAA) - USA
推荐引用方式 GB/T 7714	Sullivan, Amy P.,Pokhrel, Rudra P.,Shen, Yingjie,et al. Examination of brown carbon absorption from wildfires in the western US during the WE-CAN study[J],2022,22(20):18.
APA	Sullivan, Amy P..,Pokhrel, Rudra P..,Shen, Yingjie.,Murphy, Shane M..,Toohey, Darin W..,...&Collett, Jeffrey L., Jr..(2022).Examination of brown carbon absorption from wildfires in the western US during the WE-CAN study.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(20),18.
MLA	Sullivan, Amy P.,et al."Examination of brown carbon absorption from wildfires in the western US during the WE-CAN study".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.20(2022):18.