The summertime Boreal forest field measurement intensive (HUMPPA-COPEC-2010): an overview of meteorological and chemical influences
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Abstract
This paper describes the background, instrumentation,
goals, and the regional influences on the HUMPPACOPEC
intensive field measurement campaign, conducted
at the Boreal forest research station SMEAR II (Station
for Measuring Ecosystem-Atmosphere Relation) in Hyyti¨al¨a,
Finland from 12 July–12 August 2010. The prevailing meteorological
conditions during the campaign are examined and
contrasted with those of the past six years. Back trajectory
analyses show that meteorological conditions at the site in
2010 were characterized by a higher proportion of southerly
flow than in the other years studied. As a result the summer of 2010 was anomalously warm and high in ozone making
the campaign relevant for the analysis of possible future climates.
A comprehensive land use analysis, provided on both
5 and 50 km scales, shows that the main vegetation types surrounding
the site on both the regional and local scales are:
coniferous forest (Scots pine and/or Norway spruce); mixed
forest (Birch and conifers); and woodland scrub (e.g. Willows,
Aspen); indicating that the campaign results can be
taken as representative of the Boreal forest ecosystem. In
addition to the influence of biogenic emissions, the measurement
site was occasionally impacted by sources other than
vegetation. Specific tracers have been used here to identify
the time periods when such sources have impacted the
site namely: biomass burning (acetonitrile and CO), urban anthropogenic pollution (pentane and SO2) and the nearby
Korkeakoski sawmill (enantiomeric ratio of chiral monoterpenes).
None of these sources dominated the study period,
allowing the Boreal forest summertime emissions to be assessed
and contrasted with various other source signatures.
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Bibliographic citation
Williams, J., Crowley, J., Fischer, H., Harder, H., Martinez, M., Petäjä, T., Rinne, J., Bäck, J., Boy, M., Dal Maso, M., Hakala, J., Kajos, M., Keronen, P., Rantala, P., Aalto, J., Aaltonen, H., Paatero, J., Vesala, T., Hakola, H., Levula, J., Pohja, T., Herrmann, T., Auld, J., Mesarchaki, E., Song, W., Yassaa, N., Nölscher, A., Johnson, A.M., Custer, T., Sinha, V., Thieser, J., Pouvesle, N., Taraborrelli, D., Tang, M.J., Bozem, H., Hosaynali-Beygi, Z., Axinte, R., Oswald, R., Novelli, A., Kubistin, D., Hens, K., Javed, U., Trawny, K., Breitenberger, C., Hidalgo Fernández, P.J., Ebben, C.J., Geiger, F.M., Corrigan, A.L., Russell, L.M., Ouwersloot, H.G., Vilà-Guerau de Arellano, J., Ganzeveld, L., Vogel, A., Beck, M., Bayerle, A., Kampf, C.J., Bertelmann, M., Köllner, F., Hoffmann, T., Valverde, J., González, D., Riekkola, M.L., Kulmala, M., Lelieveld, J.: "The summertime Boreal forest field measurement intensive (HUMPPA-COPEC-2010): an overview of meteorological and chemical influences". Atmospheric Chemistry and Physics. Vol. 11, págs. 10599–10618, (2011). ISSN 1680-7316
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