Time fluctuations of small ion number density in the atmospheric surface layer |
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| Authors: | Sven Israelsson |
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| Institution: | (1) Department of Meteorology, University of Uppsala, Uppsala, Sweden |
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| Abstract: | The standard deviations and time-spectra of small ion number density have been measured at ground level under different atmospheric stability conditions. The auto-correlation correlograms and the time-spectra imply a scale of fluctuations corresponding to 1 to 4 min. No clear relationships between standard deviations of small ion number density and micro-meteorological parameters are observed. Thus the results are not a support for Monin-Obukhov similarity theory. For the highest frequencies the slopes of the spectra seem to follow the –5/3-law fairly well and the frequencies of the peak values of individual spectra lnfS(f) increase when the atmosphere stability increases, which is valid for ordinary micrometeorological parameters. |
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| Keywords: | Atmospheric electricity Small ions Stability Turbulence |
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