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Bulgarian Journal of Physics
Print: 1310-0157 Online: 1314-2666
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RECOGNIZED BY THE EUROPEAN PHYSICAL SOCIETY 
Bulg. J. Phys. vol.27 no.3 (2000), pp. 078-081
Local Correlations in Cloud Base Height Records Studied with the Detrended Fluctuation Analysis (DFA) Method
N. Gospodinova1, K. lvanova1,2, M.A. Michalev1, E.E. Clothiaux 2
1Institute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradsko chaussee, Sofia 1784, Bulgaria
2Department of Meteorology , Pennsylvania State University, University Park , PA 16802, USA
go back1Institute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradsko chaussee, Sofia 1784, Bulgaria
2Department of Meteorology , Pennsylvania State University, University Park , PA 16802, USA
Abstract. The Detrended Fluctuation Analysis statistical method is applied to son out temporal correlations in atmospheric data series records. The data used in this study is the cloud base height sequences measured with laser ceilometer with time resolution of 30 seconds. The existence of long-range power-law correlations in the cloud base height fluctuations was found to hold over about one hour period [ l2]. They are of antipersistent type with an exponent α ≈ 0.24 . In this study we investigate the "local long-range correlations". In all cases studied antipersistent local correlations hold and they reflect the dynamics of the cloud base height changes. The occurrence of these statistics in cloud base height fluctuations suggests the usefulness of similar studies of the radiation transfer dynamics modeling .