Boundary layer concentrations and landscape scale emissions of volatile organic compounds in early spring S. Haapanala1, J. Rinne1, H. Hakola2, H. Hellén2, L. Laakso1, H. Lihavainen3, R. Janson4, C. O'Dowd5, and M. Kulmala1 1University of Helsinki, Department of Physical Sciences, Helsinki, Finland 2Finnish Meteorological Institute, Air Chemistry Laboratory, Helsinki, Finland 3Finnish Meteorological Institute, Climate and Global Change Research, Helsinki, Finland 4Stockholm University, Department of Applied Environmental Science, Stockholm, Sweden 5National University of Ireland, Department of Physics, Galway, Ireland
Abstract. Boundary layer concentrations of several volatile organic compounds (VOC)
were measured during two campaigns in springs of 2003 and 2006. The
measurements were conducted over boreal landscapes near SMEAR II measurement
station in Hyytiälä, Southern Finland. In 2003 the measuremens were
performed using a light aircraft and in 2006 using a hot air balloon.
Isoprene concentrations were low, usually below detection limit. This can be
explained by low biogenic production due to cold weather, phenological stage
of the isoprene emitting plants, and snow cover. Monoterpenes were observed
frequently. The average total monoterpene concentration in the boundary
layer was 33 pptv. Many anthropogenic compounds such as benzene, xylene
and toluene, were observed in high amounts. Ecosystem scale surface
emissions were estimated using a simple mixed box budget methodology. Total
monoterpene 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 emission
algorithm. The highest emissions of anthropogenic compounds were those of
Citation: Haapanala, S., Rinne, J., Hakola, H., Hellén, H., Laakso, L., Lihavainen, H., Janson, R., O'Dowd, C., and Kulmala, M.: Boundary layer concentrations and landscape scale emissions of volatile organic compounds in early spring, Atmos. Chem. Phys., 7, 1869-1878, doi:10.5194/acp-7-1869-2007, 2007.