Boundary layer concentrations and landscape scale emissions of volatile organic compounds in early spring

[摘要] Boundary layer concentrations of several volatile organic compounds (VOC)were measured during two campaigns in springs of 2003 and 2006. Themeasurements were conducted over boreal landscapes near SMEAR II measurementstation in Hyytiälä, Southern Finland. In 2003 the measuremens wereperformed using a light aircraft and in 2006 using a hot air balloon.Isoprene concentrations were low, usually below detection limit. This can beexplained by low biogenic production due to cold weather, phenological stageof the isoprene emitting plants, and snow cover. Monoterpenes were observedfrequently. The average total monoterpene concentration in the boundarylayer was 33 ppt_v. Many anthropogenic compounds such as benzene, xyleneand toluene, were observed in high amounts. Ecosystem scale surfaceemissions were estimated using a simple mixed box budget methodology. Totalmonoterpene emissions varied up to 80 μg m⁻² h⁻¹, α-pinene contributing typically more than two thirds of that. These emissions were somewhat higher that those calculated using emissionalgorithm. The highest emissions of anthropogenic compounds were those ofp/m xylene.

[学科分类] 大气科学