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The multifractal properties of a set of precipitation intensity fields measured during the Global Atmospheric Research Program (GARP) Atlantic Tropical Experiment (GATE) are studied, and it is shown that one cannot reject the null hypothesis that the fields are generated by a nonlinear transformation of a linear Gaussian process. These results indicate that the choice of representing rainfall fields in terms of multifractal cascades or as a nonlinear transformation of a linear Gaussian process should be based on physical motivations and not solely on the outcome of data analysis.
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Ferraris et al. (2003) studied this question.
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