Collaborative Research: Biogenic Volatile Organic Compounds and their Impacts in a Changing Temperate Forest

合作研究：生物挥发性有机化合物及其对不断变化的温带森林的影响

• 批准号: 1121207
• 负责人: Paul Shepson
• 金额: $ 16.27万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-08-15 至 2013-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1121207&HistoricalAwards=false
• 关键词: Collaborative; Research; Biogenic; Volatile; Organic

This project is a collaborative effort involving investigators from four institutions with complimentary expertise in measuring and interpreting biogenic volatile organic carbon (BVOC) compounds and associated reaction products. The project is envisioned as part of a longer-term research initiative designed to test the following hypothesis: "The impact of BVOC emissions on climate depends on the structures of the BVOC; while isoprene can impact ozone production, terpenes are more effective at nitrogen sequestration and aerosol production; the change to terpene-dominance in forests will lead to more carbon sequestration, other factors remaining the same." During year 1, the principal investigators (PIs) will construct and test in the laboratory an automated measurement system consisting of a sampling apparatus, a two-dimensional gas chromatograph (GCxGC), and a calibration system to quantify ambient mixing ratios of speciated BVOCs and reaction products hourly. The sampling apparatus will concentrate BVOCs and reaction products and transfer to a GC fitted with two secondary columns. One channel will feed a flame ionization detector (FID) to quantify BVOCs and the other an electron capture detector (ECD) to quantify oxidation products (including nitrates and hydroxynitrate). The general utility calibration source will include a temperature-controlled bath containing multiple compound-specific diffusion tubes and associated plumbing. During year 2, the PIs will deploy and continuously operate this novel semi-autonomous measurement system at the Program for Research on Oxidants: PHotochemistry, Emissions, & Transport (PROPHET) site at the University of Michigan Biological Station (UMBS) over a 4-week period during the growing season. The goal of the field deployment will be to test the instrument's performance in reliably quantifying a broad suite of heavy alkanes, alkenes, aromatics, isoprene, montoterpenes, sesquiterpenes, aldehydes and ketones, and alcohols, and organic nitrates in ambient air within and above the forest canopy.The development of a semi-autonomous measurement system for BVOCs and reaction products will enhance observational resolution for investigations of interactions among forest dynamics, oxidation processes, aerosol production, nitrogen and carbon sequestration, and associated feedbacks on climate. Results from the project will also extend the PROPHET data archive, which has been a valuable community resource for broader investigations of forest-atmosphere interactions. Graduate and undergraduate students will participate directly in constructing and field testing the instrument. Results will be disseminated through articles in the scientific literature and also incorporated into an inquiry-based instructional webquest to help high school students understand biosphere-atmosphere research in the context of global climate change. This webquest would become part of a library of similar educational resources at UMBS.

该项目是一项合作努力，涉及来自四个机构的研究人员，他们在测量和解释生物挥发性有机碳(BVOC)化合物和相关反应产物方面拥有互补的专业知识。该项目被设想为一项长期研究计划的一部分，该计划旨在检验以下假设：“BVOC排放对气候的影响取决于BVOC的结构；虽然异戊二烯会影响臭氧的产生，但萜烯在固氮和气溶胶产生方面更有效；改变森林中萜烯的主导地位将导致更多的碳固定，其他因素保持不变。”在第一年，首席调查员将在实验室建造和测试一个自动测量系统，该系统包括一个采样设备、一个二维气相色谱仪(GCxGC)和一个校准系统，以每小时量化各种BVOCs和反应产物的环境混合比率。采样装置将浓缩BVOCs和反应产物，并转移到配有两个二级色谱柱的GC。一个通道将馈送火焰电离检测器(FID)以定量BVOCs，另一个通道将馈送电子捕获检测器(ECD)以定量氧化产物(包括硝酸盐和羟基硝酸盐)。通用校准源将包括一个温控浴缸，其中包含多个特定于化合物的扩散管和相关管道。在第二年，PI将在密歇根大学生物站(UMBS)的氧化剂研究计划(PROPHET)站点部署并持续运行这种新型的半自主测量系统，在生长季节的四周时间内。现场部署的目标将是测试该仪器在可靠地量化森林树冠内外环境空气中的一系列重烷烃、烯烃、芳烃、异戊二烯、蒙萜烯、倍半萜、醛和酮、醇以及有机硝酸盐方面的性能。开发一个BVOCs和反应产物的半自主测量系统将提高观测分辨率，以研究森林动态、氧化过程、气溶胶产生、氮和碳固存以及相关的气候反馈之间的相互作用。该项目的结果还将扩大Prophet数据档案，这是一个宝贵的社区资源，可以更广泛地调查森林-大气相互作用。研究生和本科生将直接参与仪器的建造和现场测试。结果将通过科学文献中的文章传播，并纳入以探究为基础的教学WebQuest，以帮助高中生了解全球气候变化背景下的生物圈-大气研究。这个WebQuest将成为密歇根大学商学院类似教育资源库的一部分。