Silva Fennica : quarterly issues : 30(2–3) : sa3023097.htm

Mika Aurela, Tuomas Laurila & Juha-Pekka Tuovinen. 1996.

Measurements of O3, CO2 and H2O fluxes over a Scots pine stand in eastern Finland by the micrometeorological eddy covariance method

Silva Fennica 30(2–3): 97–108

The eddy covariance technique is a novel micrometeorological method that enables the determination of the atmosphere-biosphere exchange rate of gases such as ozone and carbon dioxide on an ecosystem scale. This paper describes the technique and presents results from the first direct measurements of turbulent fluxes of O3, CO2 and H2O above a forest in Finland. The measurements were performed during 15 July–5 August 1994 above a Scots pine stand near the Mekrijärvi research station in Eastern Finland. The expected diurnal cycles were observed in the atmospheric fluxes of O3, CO2 and H2O. The data analysis includes interpretation of the O3 flux in terms of the dry deposition velocity and evaluation the dependency of the net CO2 flux on radiation. The eddy covariance method and the established measurement system has proved suitable for providing high-resolution data for studying ozone deposition to a forest as well as the net carbon balance and related physiological processes of an ecosystem.

Keywords
eddy covariance technique, ozone deposition, net carbon balance, micrometeorology, Scots pine stands

Addresses
Finnish Meteorological Institute, Air Quality Department, Sahaajankatu 20 E, FIN-00810 Helsinki, Finland. Fax +358 9 758 1396, E-mail mika.aurela@fmi.fi

Received 22 September 1995 Accepted 31 May 1996
ISSN 0037-5330

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