气候变化领域集成服务门户(CCPortal): Boundary layer versus free tropospheric submicron particle formation: A case study from NASA DC-8 observations in the Asian continental outflow during the KORUS-AQ campaign

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DOI	10.1016/j.atmosres.2021.105857
	Boundary layer versus free tropospheric submicron particle formation: A case study from NASA DC-8 observations in the Asian continental outflow during the KORUS-AQ campaign
	Park D.-H.; Cho C.; Kim H.; Park R.J.; Anderson B.; Lee T.; Huey G.L.; Wennberg P.O.; Weinheimer A.J.; Yum S.S.; Long R.; Kim S.-W.
发表日期	2021
ISSN	0169-8095
卷号	264
英文摘要	In this study, we contrasted major secondary inorganic species and processes responsible for submicron particle formation (SPF) events in the boundary layer (BL) and free troposphere (FT) over the Korean Peninsula during Korea-United States Air Quality (KORUS-AQ) campaign (May–June 2016) using aircraft observations. The number concentration of ultrafine particles with diameters between 3 nm and 10 nm (NCN3–10) during the entire KORUS-AQ period reached a peak (7606 ± 12,003 cm−3) at below 1 km altitude, implying that the particle formation around the Korean Peninsula primarily occurred in the daytime BL. During the BL SPF case (7 May 2016), the SPF over Seoul metropolitan area was more attributable to oxidation of NO2 rather than SO2-to-sulfate conversion. From the analysis of the relationship between nitrogen oxidation ratio (NOR) and temperature or relative humidity (RH), NOR showed a positive correlation only with temperature. This suggests that homogeneous gas-phase reactions of NO2 with OH or O3 contributed to nitrate formation. From the relationship between NCN3–10 (> 10,000 cm−3) and the NOR (or sulfur oxidation ratio) at Olympic Park in Seoul during the entire KORUS-AQ period, it was regarded that the relative importance of nitrogen oxidation was grown as the NCN3–10 increased. During the FT SPF case (31 May 2016) over the yellow sea, the SO2-to-sulfate conversion seemed to influence SPF highly. The sulfate/CO ratio had a positive correlation with both the temperature and RH, suggesting that aqueous-phase pathways as well as gas-phase reactions might be attributable to sulfate formation in the FT. In particular, FT SPF event on 31 May was possibly caused by the direct transport of SO2 precursors from the continent above the shallow marine boundary layer under favorable conditions for FT SPF events, such as decreased aerosol surface area and increased solar radiation. © 2021
英文关键词	Boundary layer; Free troposphere; KORUS-AQ; Secondary inorganic aerosols; Submicron particle formation
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236566
作者单位	School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea; NASA Langley Research Center, Hampton, VA, United States; Department of Environmental Science, Hankuk University of Foreign Studies, South Korea; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States; California Institute of Technology, Pasadena, CA, United States; National Center for Atmospheric Research, Boulder, CO, United States; Department of Atmosphere Science, Yonsei University, Seoul, South Korea; Office of Research and Development, U.S. EPA, Research Triangle ParkNC, United States
推荐引用方式 GB/T 7714	Park D.-H.,Cho C.,Kim H.,et al. Boundary layer versus free tropospheric submicron particle formation: A case study from NASA DC-8 observations in the Asian continental outflow during the KORUS-AQ campaign[J],2021,264.
APA	Park D.-H..,Cho C..,Kim H..,Park R.J..,Anderson B..,...&Kim S.-W..(2021).Boundary layer versus free tropospheric submicron particle formation: A case study from NASA DC-8 observations in the Asian continental outflow during the KORUS-AQ campaign.Atmospheric Research,264.
MLA	Park D.-H.,et al."Boundary layer versus free tropospheric submicron particle formation: A case study from NASA DC-8 observations in the Asian continental outflow during the KORUS-AQ campaign".Atmospheric Research 264(2021).