气候变化领域集成服务门户(CCPortal): Transport-driven aerosol differences above and below the canopy of a mixed deciduous forest

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DOI	10.5194/acp-21-17031-2021
	Transport-driven aerosol differences above and below the canopy of a mixed deciduous forest
	Bui A.A.T.; Wallace H.W.; Kavassalis S.; Alwe H.D.; Flynn J.H.; Erickson M.H.; Alvarez S.; Millet D.B.; Steiner A.L.; Griffin R.J.
发表日期	2021
ISSN	1680-7316
起始页码	17031
结束页码	17050
卷号	21 期号:22
英文摘要	Exchanges of energy and mass between the surrounding air and plant surfaces occur below, within, and above a forest's vegetative canopy. The canopy also can lead to vertical gradients in light, trace gases, oxidant availability, turbulent mixing, and properties and concentrations of organic aerosol (OA). In this study, a high-resolution time-of-flight aerosol mass spectrometer was used to measure non-refractory submicron aerosol composition and concentration above (30 m) and below (6 m) a forest canopy in a mixed deciduous forest at the Program for Research on Oxidants: PHotochemistry, Emissions, and Transport tower in northern Michigan during the summer of 2016. Three OA factors are resolved using positive matrix factorization: more-oxidized oxygenated organic aerosol (MO-OOA), isoprene-epoxydiol-derived organic aerosol (IEPOX-OA), and 91Fac (a factor characterized with a distinct fragment ion at m/z 91) from both the above-and the below-canopy inlets. MO-OOA was most strongly associated with long-range transport from more polluted regions to the south, while IEPOX-OA and 91Fac were associated with shorter-range transport and local oxidation chemistry. Overall vertical similarity in aerosol composition, degrees of oxidation, and diurnal profiles between the two inlets was observed throughout the campaign, which implies that rapid in-canopy transport of aerosols is efficient enough to cause relatively consistent vertical distributions of aerosols at this scale. However, four distinct vertical gradient episodes are identified for OA, with vertical concentration differences (above-canopy minus below-canopy concentrations) in total OA of up to 0.8 μg m-3, a value that is 42 % of the campaign average OA concentration of 1.9 μg m-3. The magnitude of these differences correlated with concurrent vertical differences in either sulfate aerosol or ozone. These differences are likely driven by a combination of long-range transport mechanisms, canopy-scale mixing, and local chemistry. These results emphasize the importance of including vertical and horizontal transport mechanisms when interpreting trace gas and aerosol data in forested environments. © 2021 Alexander A. T. Bui et al.
语种	英语
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/246418
作者单位	Department of Civil and Environmental Engineering, Rice University, Houston, TX 77005, United States; Department of Chemistry, University of Toronto, Toronto, ON M5S 3H6, Canada; Department of Soil Water, and Climate, University of Minnesota, St. Paul, MN 55108, United States; Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX 77204, United States; Department of Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI 48109, United States; Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX 77005, United States; Washington State Department of Ecology, Lacey, WA 98503, United States; TerraGraphics Environmental Engineering, Pasco, WA 99301, United States
推荐引用方式 GB/T 7714	Bui A.A.T.,Wallace H.W.,Kavassalis S.,et al. Transport-driven aerosol differences above and below the canopy of a mixed deciduous forest[J],2021,21(22).
APA	Bui A.A.T..,Wallace H.W..,Kavassalis S..,Alwe H.D..,Flynn J.H..,...&Griffin R.J..(2021).Transport-driven aerosol differences above and below the canopy of a mixed deciduous forest.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(22).
MLA	Bui A.A.T.,et al."Transport-driven aerosol differences above and below the canopy of a mixed deciduous forest".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.22(2021).