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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 | 16807316 |
| 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. |
| 关键词 | atmospheric depositionclimate modelingconcentration (composition)dry depositionmixing rationitrogen oxidesparameterizationsoil emissionvapor pressurevertical distributionMichiganUnited States |
| 语种 | 英语 |
| 来源机构 | Atmospheric Chemistry and Physics |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/132218 |
| 推荐引用方式 GB/T 7714 | Delaria E.R.,Cohen R.C.. A model-based analysis of foliar NOx deposition[J]. Atmospheric Chemistry and Physics,2020,20(4). |
| APA | Delaria E.R.,&Cohen R.C..(2020).A model-based analysis of foliar NOx deposition.,20(4). |
| MLA | Delaria E.R.,et al."A model-based analysis of foliar NOx deposition".20.4(2020). |
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