Hydrogen Peroxide Fluxes to Forest Canopies: Field & Laboratory Experiments

小行星9508417 大气过氧化氢在对流层光化学和将二氧化硫转化为云水中的硫酸中起着重要作用，并且可能对植物有毒。 植物和大气过氧化氢之间的相互作用是大气科学界和植物科学界感兴趣的。 虽然量化其干沉积速率的植被是必要的光化学模型，有很少的研究，试图测量过氧化氢的沉积到植物。 在以前的工作中，它被证明是可能的，在现场和实验室实验中，测量过氧化氢具有足够的精度，使计算通量。 在这项工作中，它建议适应一个更直接的测量通量，松弛涡积累（REA）的方法，测量过氧化氢通量的森林冠层。 然后，在三年的时间里，主要研究人员将进行两种类型的实验：1）过氧化氢对森林树冠的沉积速率的实地测量，以及2）对代表森林研究中发现的一些相同物种的个别树苗进行的受控室实验。 通过进行这两个实验，将有可能量化在实验的环境条件下到冠层的沉积速率，并预测沉积速率如何随着环境条件的变化而变化。 教育计划基于三个主要目标。 与拟议的研究计划一样，教育计划强调环境研究的跨学科性质。 计划开发本科和研究生课程，强调污染物的跨介质行为，并借鉴几门科学，包括化学，生物学，大气科学和工程学。 第二个目标是提高工程专业学生的沟通技能，无论是在研究生和本科生水平。 第三个目标是提高学生的保留率，特别是来自代表性不足群体的学生。

9508417 Claiborn Atmospheric hydrogen peroxide plays important roles in tropospheric photochemistry and in converting sulfur dioxide to sulfuric acid in cloudwater, and may also be toxic to vegetation. The interactions between plants and atmospheric hydrogen peroxide are of interest to both the atmospheric and plant sciences communities. While quantification of its dry deposition rates to vegetation is necessary for photochemical models, there have been very few studies that have attempted to measure deposition of hydrogen peroxide to plants. In previous work it was demonstrated that it is possible, in both field and laboratory experiments, to measure hydrogen peroxide with adequate precision to enable calculation of fluxes. In this work, it is proposed to adapt a more direct measure of the flux, the relaxed eddy accumulation (REA) method, to measure hydrogen peroxide fluxes over a forest canopy. Then, over a three-year period, the principal investigator will conduct two types of experiments: 1) field measurements of deposition rates of hydrogen peroxide to forest canopies, and 2) controlled chamber experiments on individual saplings representing some of the same species found in the forest studies. By conducting both experiments, it will be possible to both quantify the deposition rate to the canopy under the environmental conditions of the experiment, and to predict how the deposition rate changes with changing environmental conditions. The education plan is based upon three main objectives. Like the proposed research plan, the education plan emphasizes the cross-disciplinary nature of environmental studies. Development of both undergraduate and graduate courses that emphasize the cross-media behavior of pollutants and that draw upon several sciences including chemistry, biology, atmospheric sciences, and engineering, is planned. The second objective is to improve communication skills of engineering students, both at the graduate and undergraduate levels. The third objective is to improve retention of students, particularly from underrepresented groups.