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The scaling ranges of time correlations in the cloud base height records ofmarine boundary layer stratocumulus are studied applying the DetrendedFluctuation Analysis statistical method. We have found that time dependentvariations in the evolution of the $\alpha$ exponent reflect the diurnaldynamics of cloud base height fluctuations in the marine boundary layer. Ingeneral, a more stable structure of the boundary layer corresponds to a lowervalue of the $\alpha$ - indicator, i.e. larger anti-persistence, thus a set offluctuations tending to induce a greater stability of the stratocumulus. Incontrast, during periods of higher instability in the marine boundary, lessanti-persistent (more persistent like) behavior of the system drags it out ofequilibrium, corresponding to larger $\alpha$ values. From an analysis of thefrequency spectrum, the stratocumulus base height evolution is found to be anon-stationary process with stationary increments. The occurrence of thesestatistics in cloud base height fluctuations suggests the usefulness of similarstudies for the radiation transfer dynamics modeling.Comment: 12 pages, 6 figures; to appear in Int. J. Mod. Phys. C, Vol. 13, No.  2 (2002

TIME DEPENDENT CORRELATIONS IN MARINE STRATOCUMULUS CLOUD BASE HEIGHT RECORDS