Measurements of Hydrogen Oxide (HOx) Radical Chemistry Above and Below the Forest Canopy

该项目将增进对森林排放对大气中臭氧产生的影响的了解。目前，大气化学模型倾向于高估森林环境中的臭氧浓度。大气中的自由基，如羟基(OH)，在大气化学和臭氧的产生中起着重要的作用。这个项目包括额外的大气自由基的测量和建模，以提高对大气化学的理解，并改进预测大气中臭氧和细颗粒物产生的模型。关于森林环境中HOX自由基的测量和建模的以下问题将被解决：(1)与森林环境中的OH自由基浓度测量相关的干扰的来源是什么，可以最小化吗？(2)我们对森林环境中的HOX自由基的来源、汇和循环有多好的了解？以及(3)树冠下的基本化学和运输对上述树冠环境有何影响？该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

This project will improve understanding of the influence of forest emissions on the production of ozone in the atmosphere. Currently, atmospheric chemistry models tend to overpredict the concentration of ozone in forested environments. Atmospheric radicals, such as the hydroxyl radical (OH), play an important role in the chemistry of the atmosphere and in the production of ozone. This project includes additional measurements and modeling of atmospheric radicals to improve the understanding of atmospheric chemistry and for improving models that predict the production of ozone and fine particulates in the atmosphere.The following questions regarding the measurement and modeling of HOx radicals in forested environments will be addressed: (1) What is the source of the interference associated with measurements of OH radical concentrations in forest environments and can it be minimized? (2) How well do we understand the sources, sinks, and recycling of HOx radicals in forest environments? and (3) How does below canopy radical chemistry and transport impact the above canopy environment?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.