气候变化领域集成服务门户(CCPortal): Laboratory measurements of stomatal NO2 deposition to native California trees and the role of forests in the NOx cycle

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DOI	10.5194/acp-20-14023-2020
	Laboratory measurements of stomatal NO2 deposition to native California trees and the role of forests in the NOx cycle
	Delaria E.R.; Place B.K.; Liu A.X.; Cohen R.C.
发表日期	2020
ISSN	1680-7316
起始页码	14023
结束页码	14041
卷号	20 期号:22
英文摘要	Both canopy-level field measurements and laboratory studies suggest that uptake of NO2 through the leaf stomata of vegetation is a significant sink of atmospheric NOx. However, the mechanisms of this foliar NO2 uptake and their impact on NOx lifetimes remain incompletely understood. To understand the leaf-level processes affecting ecosystem-scale atmosphere-biosphere NOx exchange, we have conducted laboratory experiments of branch-level NO2 deposition fluxes to six coniferous and four broadleaf native California trees using a branch enclosure system with direct laser-induced fluorescence (LIF) detection of NO2. We report NO2 foliar deposition that demonstrates a large degree of inter-species variability, with maximum observed deposition velocities ranging from 0.15 to 0.51 cms-1 during the daytime, as well as significant stomatal opening during the night. We also find that the contribution of mesophyllic processing to the overall deposition rate of NO2 varies by tree species but has an ultimately inconsequential impact on NOx budgets and lifetimes. Additionally, we find no evidence of any emission of NO2 from leaves, suggesting an effective unidirectional exchange of NOx between the atmosphere and vegetation. © 2020 Author(s).
语种	英语
scopus关键词	atmosphere-biosphere interaction; atmospheric chemistry; depositional environment; laboratory method; nitrogen dioxide; stomatal conductance; trace element; vegetation dynamics; California; United States
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/247356
作者单位	Department of Chemistry, University of California Berkeley, Berkeley, CA, United States; Department of Earth and Planetary Science, University of California Berkeley, Berkeley, CA, United States
推荐引用方式 GB/T 7714	Delaria E.R.,Place B.K.,Liu A.X.,et al. Laboratory measurements of stomatal NO2 deposition to native California trees and the role of forests in the NOx cycle[J],2020,20(22).
APA	Delaria E.R.,Place B.K.,Liu A.X.,&Cohen R.C..(2020).Laboratory measurements of stomatal NO2 deposition to native California trees and the role of forests in the NOx cycle.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(22).
MLA	Delaria E.R.,et al."Laboratory measurements of stomatal NO2 deposition to native California trees and the role of forests in the NOx cycle".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.22(2020).