Collaborative Research: Forest-Atmosphere Volatile Organic Compound (VOC) Exchange for a Coniferous Ecosystem - Closing the Flux Budget

合作研究：针叶林生态系统的森林-大气挥发性有机化合物 (VOC) 交换 - 关闭通量预算

• 批准号: 1932771
• 负责人: Dylan Millet
• 金额: $ 56.41万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-11-01 至 2023-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1932771&HistoricalAwards=false
• 关键词: Collaborative; Research; Forest; Atmosphere; Volatile

This project is focused on the two-way exchange of biogenic volatile organic compounds (BVOCs) between coniferous forests and the atmosphere. Recent observations include ecosystem-atmosphere fluxes for many hundreds of organic species, vastly more than are included in current chemical transport models. The impacts of these "missing" organic species is unknown, resulting in models that are fundamentally limited in their ability to simulate forest-atmosphere volatile organic carbon exchange. This research will better define the ecosystem-atmosphere fluxes that take place in coniferous forests, enabling models to better predict the carbon exchange that is taking place. Carbon is an essential element for all life, so understanding how it moves helps us to understand biological processes and factors that influence them.This research will address the following scientific questions: (1) What is the reactive carbon flux budget across the mass spectrum for a coniferous forest? What is the importance of these two-way fluxes for atmospheric OH reactivity? Is there a significant role for previously unidentified or unmodeled compounds? (2) How do the emissions and deposition of individual organic molecules, classes of BVOCs (by O:C ratio, OH rate constant, degree of unsaturation, etc.), and the overall reactive ensemble, vary temporally and as a function of environmental drivers? To what extent do current models capture these dependencies? (3) How do individual ecosystem components (e.g., overstory, understory, soils), in-canopy chemistry, and deposition combine to drive the overall net forest-atmosphere flux budget? Can we close the ecosystem-level BVOC flux budget by reconciling these different terms? And (4) What are the broader implications of this full suite of BVOC fluxes for atmospheric composition, near-surface ozone, and HOx chemistry? The research plan combines two high-resolution TOF-CIMS to measure canopy-level BVOC fluxes across the entire mass range over a coniferous forest to assess the importance of those fluxes for OH reactivity.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.

该项目的重点是针叶林和大气之间生物挥发性有机化合物（BVOC）的双向交换。 最近的观测包括数百种有机物种的生态系统-大气通量，远远超过当前化学迁移模型中包含的数据。这些“缺失”的有机物种的影响尚不清楚，导致模型模拟森林-大气挥发性有机碳交换的能力从根本上受到限制。 这项研究将更好地定义针叶林中发生的生态系统-大气通量，使模型能够更好地预测正在发生的碳交换。 碳是所有生命的基本元素，因此了解它的移动方式有助于我们了解生物过程和影响它们的因素。这项研究将解决以下科学问题：（1）针叶林整个质谱的反应性碳通量预算是多少？这些双向通量对于大气 OH 反应性有何重要性？先前未识别或未建模的化合物是否具有重要作用？ (2) 单个有机分子、BVOC 类别（按 O:C 比、OH 速率常数、不饱和度等）以及总体反应性整体的排放和沉积如何随时间变化并作为环境驱动因素的函数？当前模型在多大程度上捕获了这些依赖性？ (3) 各个生态系统组成部分（例如，林上、林下、土壤）、冠层内化学和沉积如何结合起来驱动总体净森林大气通量预算？我们能否通过协调这些不同的条款来关闭生态系统层面的 BVOC 通量预算？ (4) 全套 BVOC 通量对大气成分、近地表臭氧和 HOx 化学有哪些更广泛的影响？ 该研究计划结合了两个高分辨率 TOF-CIMS，测量针叶林整个质量范围内的冠层 BVOC 通量，以评估这些通量对 OH 反应性的重要性。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审查标准进行评估，被认为值得支持。

项目成果

Closing the Reactive Carbon Flux Budget: Observations From Dual Mass Spectrometers Over a Coniferous Forest

关闭反应碳通量预算：双质谱仪对针叶林的观测

• DOI: 10.1029/2023jd038753
• 发表时间: 2023
• 期刊: Journal of Geophysical Research: Atmospheres
• 作者: Vermeuel, Michael P.;Millet, Dylan B.;Farmer, Delphine K.;Pothier, Matson A.;Link, Michael F.;Riches, Mj;Williams, Sara;Garofalo, Lauren A.
• 通讯作者: Garofalo, Lauren A.

Wildfire Smoke Directly Changes Biogenic Volatile Organic Emissions and Photosynthesis of Ponderosa Pines

• DOI: 10.1029/2023gl106667
• 发表时间: 2024-03-28
• 期刊: GEOPHYSICAL RESEARCH LETTERS
• 影响因子: 5.2
• 作者: Riches，M.;Berg，T. C.;Farmer，D. K.
• 通讯作者: Farmer，D. K.

In-Canopy Chemistry, Emissions, Deposition, and Surface Reactivity Compete to Drive Bidirectional Forest-Atmosphere Exchange of VOC Oxidation Products

树冠内化学、排放、沉积和表面反应性相互竞争，推动 VOC 氧化产物的双向森林-大气交换

• DOI: 10.1021/acsestair.3c00074
• 发表时间: 2024
• 期刊: ACS ES&T Air
• 作者: Link, Michael F.;Pothier, Matson A.;Vermeuel, Michael P.;Riches, Mj;Millet, Dylan B.;Farmer, Delphine K.
• 通讯作者: Farmer, Delphine K.