Collaborative Research: Understanding Emission Sources and Sinks of Nitrous Acid in North American Forests
合作研究:了解北美森林亚硝酸的排放源和汇
基本信息
- 批准号:2243203
- 负责人:
- 金额:$ 5.56万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2023
- 资助国家:美国
- 起止时间:2023-04-01 至 2026-03-31
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
This project focuses on land-atmosphere interactions and the mechanisms by which nitrous acid (HONO) and other nitrogen oxides emitted from soils influence the oxidizing capacity of the atmosphere. The experimental plans include the use of growth chambers under controlled conditions combined with field data to study the uptake of HONO onto leaves from a range of tree species that dominate major forested regions across North America. Since HONO is not well represented in chemical transport models, improvements in understanding HONO sources and sinks are expected to have important implications for improving air quality models and for determining the lifetime of some greenhouse gases, such as methane, in the atmosphere.This effort combines expertise in atmospheric chemistry, microbial ecology, and modeling with unique analytical capabilities for measuring HONO soil emissions. The central hypothesis of this proposal is that variations in below-canopy hydrogen oxide radical (HOx) cycling and ozone levels in forested regions are driven by the variability of soil emissions of HONO (SHONO) and nitrogen oxide (NO) (SNO), that depend on season, edaphic properties, aboveground vegetation surfaces, and belowground nitrogen cycling that is mediated by microbe-plant interactions. Preliminary data show that high SNO has a significant impact on below canopy HOx in a forested environment, that NOy (the sum of reactive nitrogen oxides) fluxes are linked to forest composition, and that spatial variability in NOy fluxes can be mapped across the continental U.S. using forest inventory plots. The objectives of the research are to: (1) Establish geospatial trends in SHONO across U.S. forests; (2) Carry out field campaigns to measure SHONO in mixed deciduous forests; and (3) Quantify uptake of HONO by leaf and soil surfaces.The project will support a full-time postdoctoral researcher and a graduate student who will receive training in state-of-the science analytical and modeling methods. Undergraduate students will be directly involved in the research as part of Indiana University’s Groups Summer Research Experience Program, which gives entering first-year students research experience and skills to excel in STEM majors.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
该项目的重点是土地-大气的相互作用以及土壤排放的亚硝酸和其他氮氧化物影响大气氧化能力的机制。实验计划包括在受控条件下使用生长室,结合实地数据,研究HONO在北美主要森林地区的一系列树种叶片上的吸收。由于HONO在化学传输模型中没有很好的代表性,因此,对HONO源和汇的理解的改善预计将对改善空气质量模型和确定某些温室气体(如甲烷)在大气中的寿命产生重要影响。该建议的核心假设是,在树冠下的氢氧化物自由基(HOx)循环和臭氧水平的变化,在森林地区的HONO(SHONO)和氮氧化物(NO)(SNO),这取决于季节,土壤性质,地上植被表面,和地下氮循环介导的微生物-植物相互作用的土壤排放的变化。初步数据表明,高SNO有显着的影响下冠层HOx在森林环境中,NOy(活性氮氧化物的总和)通量与森林组成,NOy通量的空间变异性可以映射到整个美国大陆使用森林清查图。该研究的目标是:(1)建立美国森林中HONO的地理空间趋势;(2)开展实地活动,测量混合落叶林中的HONO;(3)量化叶片和土壤表面对HONO的吸收。该项目将支持一名全职博士后研究员和一名研究生,他们将接受科学分析和建模方法的培训。作为印第安纳州大学团体夏季研究体验计划的一部分,本科生将直接参与这项研究,该计划为进入STEM专业的一年级学生提供研究经验和技能。该奖项反映了NSF的法定使命,并通过使用基金会的智力价值和更广泛的影响力审查标准进行评估,被认为值得支持。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Jeffrey Geddes其他文献
Effects of Urbanization and Forest Fragmentation on Atmospheric Nitrogen Inputs and Ambient Nitrogen Oxide and Ozone Concentrations in Mixed Temperate Forests
城市化和森林破碎化对温带混交林大气氮输入以及环境氮氧化物和臭氧浓度的影响
- DOI:
10.1029/2023jg007543 - 发表时间:
2023 - 期刊:
- 影响因子:0
- 作者:
Jenna E. Rindy;Erin A. Pierce;Jeffrey Geddes;Sarah M. Garvey;Jonathan Gewirtzman;Charles T. Driscoll;L. Hutyra;P. Templer - 通讯作者:
P. Templer
Jeffrey Geddes的其他文献
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{{ truncateString('Jeffrey Geddes', 18)}}的其他基金
CAREER: Air Quality Impacts of Dynamic Forest-Atmosphere-Chemistry Interactions
职业:动态森林-大气-化学相互作用对空气质量的影响
- 批准号:
1750328 - 财政年份:2018
- 资助金额:
$ 5.56万 - 项目类别:
Continuing Grant
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