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The monthly mean values of the atmospheric carbon dioxideconcentration derived from in-situ air samples collected at Mauna LoaObservatory, Hawaii, USA during 1958–2004 (the longest continuous recordavailable in the world) are analyzed by employing the detrended fluctuationanalysis to detect scaling behavior in this time series. The main result isthat the fluctuations of carbon dioxide concentrations exhibit long-rangepower-law correlations (long memory) with lag times ranging from four monthsto eleven years, which correspond to 1/f noise. This result indicates thatrandom perturbations in the carbon dioxide concentrations give rise tonoise, characterized by a frequency spectrum following a power-law withexponent that approaches to one; the latter shows that the correlation timesgrow strongly. This feature is pointing out that a correctly rescaled subsetof the original time series of the carbon dioxide concentrations resemblesthe original time series. Finally, the power-law relationship derived fromthe real measurements of the carbon dioxide concentrations could also serveas a tool to improve the confidence of the atmospheric chemistry-transportand global climate models

Technical Note: Long-term memory effect in the atmospheric CO&lt;sub&gt;2&lt;/sub&gt; concentration at Mauna Loa

Technical Note: Long-term memory effect in the atmospheric CO<sub>2</sub> concentration at Mauna Loa