Measurement and Interpretation of OH, HO2, and OH Reactivity during BEARPEX 09

生物圈对气溶胶和光化学实验的影响（BEARPEX-09）野外研究将于2009年夏天在加州内华达山脉的Blodgett森林进行，以调查森林排放的气体对大气化学和气溶胶形成的影响。该合同将支持在可移动升降机顶篷上下不同高度测量羟基自由基（OH）、OH反应性、羟基过氧自由基（HO2）、萘、一氧化氮（NO）、臭氧、紫外线通量、温度和风。研究问题包括：OH和HO2如何随季节变化，模型能否捕捉到观察到的差异？在测量和计算的OH反应性之间是否存在温度依赖的差异，如果存在，它们是否表明未测量的生物源排放？如何比较有和没有异戊二烯化学的模型？OH、HO2和OH反应性的高度分布是否与BEARPEX-07期间测量的相似？夜间分布的性质是什么？哪个模型最能模拟森林环境中的OH和HO2 ？这项研究的信息将用于测试和改进空气质量模型中的化学机制。森林大气化学的实验室演示将用于宾夕法尼亚州立大学的一个展览。更广泛的影响还包括通过该项目对本科生、研究生和博士后的教育。每年将赞助三到四名来自代表性不足群体的高中生参加宾夕法尼亚州立大学为期六周的地球和矿物科学暑期体验（SEEMS）。他们将使用来自BEARPEX的数据来检验不同的假设。该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。

The Biosphere Effects on Aerosol and Photochemistry Experiment (BEARPEX-09) field study will be held in summer 2009 at Blodgett Forest in the Sierra Nevada Mountains in California to investigate the impact of gases emitted by forests on atmospheric chemistry and aerosol formation. This award will support measurements of hydroxyl radical (OH), OH reactivity, hydroperoxyl radical (HO2), naphthalene, nitric oxide (NO), ozone, UV flux, temperature, and wind at different heights below, in, and above the canopy on a movable lift. Research questions include: How do OH and HO2 vary with season and can models capture the observed differences? Are there temperature-dependent disagreements between measured and calculated OH reactivity and, if so, do they indicate biogenic emissions that are not being measured? How do models with and without isoprene chemistry compare? Are height profiles of OH, HO2, and OH reactivity similar to those measured during BEARPEX-07 and what is the nature of nighttime profiles? Which models best simulate OH and HO2 in this forested environment?Information from this study will be used to test and improve the chemical mechanisms in air quality models. Laboratory demonstrations of atmospheric chemistry in forests will be developed for an exhibition at Penn State. Broader impacts also include education of undergraduates, graduate students, and post-doctoral associates through this project. Three to four high school students from under-represented groups will be sponsored each year in Penn State's six-week Summer Experience in Earth and Mineral Sciences (SEEMS). They will test different hypotheses using data from BEARPEX. This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).