A micrometeorological investigation of surface exchange parameters over heathland |
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| Authors: | Jan-Willem Erisman Jan Duyzer |
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| Institution: | (1) National Institute of Public Health and Environmental Protection, P.O. Box 1, 3720 BA Bilthoven, The Netherlands;(2) MT-TNO, P.O. Box 217, 2600 AE Delft, The Netherlands |
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| Abstract: | An automated system for measuring the dry deposition fluxes of SO2 on a routine basis based on the micrometeorological gradient technique has been developed for application over grassland and other short vegetation. The ability of the system to determine turbulent exchange parameters such as the friction velocity u
* and the heat flux H was investigated by comparison with an automated eddy correlation system.Determinations of u
* and H by both methods have generally been found to be in very good agreement for 20 min averages. Aerodynamic resistances derived from both systems showed no systematic differences but individual values differed considerably. From the analysis it appeared that in addition to classical rejection criteria on wind speed and inhomogeneity, etc., periods with large shifts in wind direction also have to be removed from the data set before interpretation. |
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