References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-7-1869-2007

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

Haapanala

¹ Rinne

¹ Hakola

² Hellén

² Laakso

¹ Lihavainen

³ Janson

⁴ O'Dowd

⁵ Kulmala

University of Helsinki, Department of Physical Sciences, Helsinki, Finland

Finnish Meteorological Institute, Air Chemistry Laboratory, Helsinki, Finland

Finnish Meteorological Institute, Climate and Global Change Research, Helsinki, Finland

Stockholm University, Department of Applied Environmental Science, Stockholm, Sweden

National University of Ireland, Department of Physics, Galway, Ireland

16 04 2007

7 7 1869 1878

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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 p/m xylene.

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