VBEAM - Variability of Biogenic Emissions of Alkenes and Methyl Halides

该项目将描述甲基卤化物和C2-C4烯烃在陆地上流入大气层的巨大空间和时间变异性。将进行实地研究，以量化高排放泥炭地牧场（谢尔曼岛）和温带森林（马尼图森林）生态系统的生态系统净通量。假设从陆地生态系统的卤甲烷和轻烯烃排放量主要是生物源，并通过生产S-腺苷-L-蛋氨酸（SAM）强烈耦合到彼此将进行调查。该研究的结果将纳入区域和全球排放模型，该模型考虑到陆地生物向大气排放的生物、物理和化学驱动因素。卤代甲烷会造成平流层臭氧消耗，而轻质烯烃则会导致对流层臭氧的产生。这些化合物的生物源排放，如植物，是有机气溶胶的主要贡献者，也影响空气质量和气候。

The project will characterize the large spatial and temporal variability in the terrestrial fluxes of methyl halides and C2-C4 alkenes into the atmosphere. Field studies will be conducted to quantify ecosystem net fluxes from high emitting peatland pasture (Sherman Island) and temperate forest (Manitou Forest) ecosystems. The hypothesis that methyl halide and light alkene emissions from terrestrial ecosystems are predominantly biogenic and are strongly coupled to each other through the production of S-adenosyl-L-methionine (SAM) will be investigated. The results of the study will be incorporated into a regional and global emissions model that takes into account biological, physical and chemical driving factors of terrestrial biogenic emissions to the atmosphere. Methyl halides impact stratospheric ozone depletion, and light alkenes contribute to tropospheric ozone production. The biogenic emissions of these compounds, from sources such as plants, are a major contributor to organic aerosols that also affect air quality and climate.