Measurements and Modeling of Isoprene Fluxes in the Program for Research on Oxidants: Photochemistry, Emissions, and Transport (PROPHET) 2000-01

在大多数农村地区，工厂排放的异戊二烯是活性碳氢化合物的主要来源。在过去的三个夏天，我们在密歇根大学生物站(UMBS)的氧化剂研究计划：光化学、排放和运输(PROPHET)中，对密歇根北部的北部阔叶林中异戊二烯的通量进行了测量。我们发现感热通量和异戊二烯通量之间存在很强的相关性。如果可以理解这种关联的基础，使用热通量作为异戊二烯排放的模型参数将代表着我们模拟异戊二烯通量的能力的显著进步。在所有中尺度气象模式和全球环流模式中，热通量都是一个固有的表层参数。因此，它很容易用于在区域和全球范围内模拟异戊二烯。在这个项目中，我们将在接下来的两个生长季节继续在Prophet/ameriflow站点进行异戊二烯通量测量。我们将使用快速异戊二烯分析仪以及快速二氧化碳、水蒸气和温度传感器来获得整个生长季的连续通量测量。

In most rural areas, plant emissions of isoprene are the dominant source of reactive hydrocarbons. During the past three summers, we have made flux measurements of isoprene over a mixed northern hardwood forest in northern Michigan as part of the Program for Research on Oxidants: Photochemistry, Emissions, and Transport (PROPHET), located at the University of Michigan Biological Station (UMBS). We have discovered a very strong correlation between sensible heat flux and isoprene flux on a daily basis. If the basis for this correlation can be understood, using heat flux as a model parameter for isoprene emissions would represent a significant advance in our ability to model isoprene fluxes. Heat flux is an inherent surface layer parameter predicted in all mesoscale meteorological models and global circulation models. Thus, it is readily available for modeling isoprene on regional and global scales. In this project we will continue our isoprene flux measurements at the PROPHET/Ameriflux site during the next two growing seasons. We will employ a fast isoprene analyzer along with fast CO2, water vapor, and temperature sensors to obtain continuous flux measurements throughout the growing season.