# The superstatistical nature and interoccurrence time of atmospheric mercury concentration fluctuation.

Bruno A.G., Carbone F., Hedgecock I.M.

Comunicazione
IV - Geofisica e fisica dell'ambiente
Aula 32C-1 - Mercoledì 19 h 09:00 - 13:00
The probability density function (PDF) of interoccurrence times (IOTs) between extreme events in atmospheric $Hg^{0}$ concentration time series was investigated. The PDF's behaviour is well described by a Tsallis q-exponential function. This result is related to long-term memory in $Hg^{0}$ dynamics in the atmosphere and can be explained in the framework of superstatistics. An extensive parameter $\mu$, encompassing all possible mesoscopic processes which affect the macroscopic dynamics, has been identified. It follows a $\chi^{2}$ distribution, indicative of the superstatistical nature of the overall process. Lastly, the possibly central role of atmospheric turbulence on extreme event dynamics is highlighted.