气候变化领域集成服务门户(CCPortal): A model-based analysis of foliar NOx deposition

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DOI	10.5194/acp-20-2123-2020
	A model-based analysis of foliar NOx deposition
	Delaria E.R.; Cohen R.C.
发表日期	2020
ISSN	1680-7316
起始页码	2123
结束页码	2141
卷号	20 期号:4
英文摘要	Foliar deposition of NO2 removes a large fraction of the global soil-emitted NOx . Understanding the mechanisms of NOx foliar loss is important for constraining surface ozone, constraining NOx mixing ratios, and assessing the impacts of nitrogen inputs to ecosystems. We have constructed a 1-D multibox model with representations of chemistry and vertical transport to evaluate the impact of leaflevel processes on canopy-scale concentrations, lifetimes, and canopy fluxes of NOx . Our model is able to closely replicate canopy fluxes and above-canopy NOx daytime mixing ratios observed during two field campaigns, one in a western Sierra Nevada pine forest (BEARPEX-2009) and the other in a northern Michigan mixed hardwood forest (UMBS-2012). We present a conceptual argument for the importance of NO2 dry deposition and demonstrate that NO2 deposition can provide a mechanistic explanation for the canopy reduction of NOx. We show that foliar deposition can explain observations suggesting as much as ∼ 60% of soil-emitted NOx is removed within forest canopies. Stomatal conductances greater than 0.1 cms-1 result in modeled canopy reduction factors in the range of those used in global models, reconciling inferences of canopy NOx reduction with leaf-level deposition processes. We show that incorporating parameterizations for vapor pressure deficit and soil water potential has a substantial impact on predicted NO2 deposition in our model, with the percent of soil NOx removed within one canopy increasing by ∼ 15% in wet conditions compared to dry conditions. NO2 foliar deposition was also found to have a significant impact on ozone and nitrogen budgets under both high- and low-NOx conditions. © 2020 Copernicus GmbH. All rights reserved.
语种	英语
scopus关键词	atmospheric deposition; climate modeling; concentration (composition); dry deposition; mixing ratio; nitrogen oxides; parameterization; soil emission; vapor pressure; vertical distribution; Michigan; 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/141528
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.,Cohen R.C.. A model-based analysis of foliar NOx deposition[J],2020,20(4).
APA	Delaria E.R.,&Cohen R.C..(2020).A model-based analysis of foliar NOx deposition.Atmospheric Chemistry and Physics,20(4).
MLA	Delaria E.R.,et al."A model-based analysis of foliar NOx deposition".Atmospheric Chemistry and Physics 20.4(2020).