Abstract
Air pollution by ozone has been recognized as a regional problem of the first priority. The acute effects on plants have been documented across Europe, and experimental evidence for chronic and subtle effects is growing. To protect crops and trees UN-ECE has defined the concept of critical levels for ozone. The concept is, however, still developing, and new research findings are needed to improve its scientific basis. O{sub 3} and CO{sub 2} are both important greenhouse gases and their exchange between the biosphere and the atmosphere is therefore a subject of growing interest. The eddy correlation technique is a new micrometeorological method to measure fluxes on the ecosystem scale. In this method the high-frequency fluctuating components of the vertical wind velocity and, for example, the concentration, are measured and correlated to give a direct measurement of the flux F{sub c} = w{sup `}c{sup `}, where the primes denote deviations from mean values. Perhaps the most difficult requirement in flux measurements with the eddy correlation technique is the need for fast-response sensors. The sampling should be done at a frequency no lower than 5 Hz. In addition general micro- meteorological requirements exist regarding statistical stationarity and horizontal homogeneity. Eddy correlation measurements
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Citation Formats
Aurela, M, and Laurila, T.
Surface fluxes of CO{sub 2}, O{sub 3} and H{sub 2}O measured by the eddy correlation technique.
Finland: N. p.,
1995.
Web.
Aurela, M, & Laurila, T.
Surface fluxes of CO{sub 2}, O{sub 3} and H{sub 2}O measured by the eddy correlation technique.
Finland.
Aurela, M, and Laurila, T.
1995.
"Surface fluxes of CO{sub 2}, O{sub 3} and H{sub 2}O measured by the eddy correlation technique."
Finland.
@misc{etde_283476,
title = {Surface fluxes of CO{sub 2}, O{sub 3} and H{sub 2}O measured by the eddy correlation technique}
author = {Aurela, M, and Laurila, T}
abstractNote = {Air pollution by ozone has been recognized as a regional problem of the first priority. The acute effects on plants have been documented across Europe, and experimental evidence for chronic and subtle effects is growing. To protect crops and trees UN-ECE has defined the concept of critical levels for ozone. The concept is, however, still developing, and new research findings are needed to improve its scientific basis. O{sub 3} and CO{sub 2} are both important greenhouse gases and their exchange between the biosphere and the atmosphere is therefore a subject of growing interest. The eddy correlation technique is a new micrometeorological method to measure fluxes on the ecosystem scale. In this method the high-frequency fluctuating components of the vertical wind velocity and, for example, the concentration, are measured and correlated to give a direct measurement of the flux F{sub c} = w{sup `}c{sup `}, where the primes denote deviations from mean values. Perhaps the most difficult requirement in flux measurements with the eddy correlation technique is the need for fast-response sensors. The sampling should be done at a frequency no lower than 5 Hz. In addition general micro- meteorological requirements exist regarding statistical stationarity and horizontal homogeneity. Eddy correlation measurements can be used to study ozone deposition velocities and the net carbon balance within the related physiological processes of the ecosystem. In this study the turbulent fluxes of these gases were measured in Finland by this direct method above a forest for the first time. Fluxes were studied in a boreal Scots pine (Pinus sylvestris) forest}
place = {Finland}
year = {1995}
month = {Dec}
}
title = {Surface fluxes of CO{sub 2}, O{sub 3} and H{sub 2}O measured by the eddy correlation technique}
author = {Aurela, M, and Laurila, T}
abstractNote = {Air pollution by ozone has been recognized as a regional problem of the first priority. The acute effects on plants have been documented across Europe, and experimental evidence for chronic and subtle effects is growing. To protect crops and trees UN-ECE has defined the concept of critical levels for ozone. The concept is, however, still developing, and new research findings are needed to improve its scientific basis. O{sub 3} and CO{sub 2} are both important greenhouse gases and their exchange between the biosphere and the atmosphere is therefore a subject of growing interest. The eddy correlation technique is a new micrometeorological method to measure fluxes on the ecosystem scale. In this method the high-frequency fluctuating components of the vertical wind velocity and, for example, the concentration, are measured and correlated to give a direct measurement of the flux F{sub c} = w{sup `}c{sup `}, where the primes denote deviations from mean values. Perhaps the most difficult requirement in flux measurements with the eddy correlation technique is the need for fast-response sensors. The sampling should be done at a frequency no lower than 5 Hz. In addition general micro- meteorological requirements exist regarding statistical stationarity and horizontal homogeneity. Eddy correlation measurements can be used to study ozone deposition velocities and the net carbon balance within the related physiological processes of the ecosystem. In this study the turbulent fluxes of these gases were measured in Finland by this direct method above a forest for the first time. Fluxes were studied in a boreal Scots pine (Pinus sylvestris) forest}
place = {Finland}
year = {1995}
month = {Dec}
}