Seasonal Trends of Springtime Ozone, Reactive Nitrogen, Carbon Monoxide, and Hydrocarbons Over North America and the Effects of Anthropogenic Emissions

本项目继续对春分对流层臭氧产生试验期间获得的观测资料进行模拟分析，以便更好地了解北纬高纬度对流层臭氧季节循环的控制影响。本文将对TOPSE期间从飞机上测量到的臭氧和一些光化学重要微量气体的季节趋势、动态和纬度分布进行表征，并进一步分析以确定控制观测数据的具体因素。通过结合多尺度模拟方法，将进行全球-区域耦合化学-输运模拟，以更好地了解自然和人为前体排放源对观测到的对流层臭氧的相对贡献和相互作用——这仍然是大空间尺度上大气化学的一个关键问题。这项研究的结果将提高我们对自然和人为排放如何影响大气的理解，并更好地表征北纬高纬度地区对流层臭氧的季节性循环，从而更好地了解人类活动如何影响对流层的化学成分和全球气候。两名研究生将在pi的指导下进行建模和分析，本科生也将通过密集的夏季研究经验参与项目。

This project continues modeling analyses of the observations acquired during the Tropospheric Ozone Production about the Spring Equinox (TOPSE) experiment in order to better understand controlling influences on the seasonal cycle of tropospheric ozone at high northern latitudes. Seasonal trends, dynamics and latitudinal distributions of ozone and selected photochemically important trace gases measured from aircraft during TOPSE will be characterized, and further analyzed to identify specific factors controlling the observational data. By combining multi-scale modeling approaches global-to-regional coupled chemistry-transport simulations will be conducted to better understand the relative contributions and interplay between natural and anthropogenic precursor emission sources on observed tropospheric ozone - still a critical issue with respect to atmospheric chemistry on larger spatial scales. Results from this study will improve our understanding of how natural and human-induced emissions are affecting the atmosphere and a better characterization on the seasonal cycle of tropospheric ozone at high northern latitudes will offer improved insight on how human activity impacts the chemistry of the troposphere and global climate. Two graduate students will be supported to conduct the modeling and analyses under the direction of the P.I., as will undergraduate students who participate in the project through a program of intensive summer research experience.