Publication Date:
2017-12-07
Description:
The probability density function (PDF) of the time intervals between subsequent extreme events in atmospheric Hg 0 concentration data series from different latitudes has been investigated. The Hg 0 dynamic possesses a long-term memory autocorrelation function. Above a fixed threshold Q in the data, the PDFs of the interoccurrence time of the Hg 0 data are well described by a Tsallis q–Exponential function. This PDF behavior has been explained in the framework of superstatistics, where the competition between multiple mesoscopic processes affects the macroscopic dynamics. An extensive parameter μ , encompassing all possible fluctuations related to mesoscopic phenomena, has been identified. It follows a χ 2 -distribution, indicative of the superstatistical nature of the overall process. Shuffling the data series destroys the long-term memory, the distributions become independent of Q , and the PDFs collapse on to the same exponential distribution. The possible central role of atmospheric turbulence on extreme events in the Hg 0 data is highlighted.
Print ISSN:
0148-0227
Topics:
Geosciences
,
Physics
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