Multifractal Dynamic Rainfall Processes in Italy

被引：0
|
作者：
A. Mazzarella
机构：
[1] Department of Geophysics and Volcanology,
[2] University of Naples,undefined
[3] Federico II,undefined
[4] Naples,undefined
[5] Italy,undefined
来源：
Theoretical and Applied Climatology | 1999年 / 63卷
关键词：
Fractal Dimension; Atmospheric Circulation; Time Range; Mediterranean Area; Threshold Intensity;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
 Historical daily rainfall events, measured at different Italian stations, are found to follow fractal relationships within specific time ranges. It is found that the fractal dimension D describes the strength of the clustering of daily rainfall events in a more realistic way than the commonly used number of daily rainfall events: the more isolated the clusters, the smaller the value of D. The large dependence of D and of the specific scaling region on the threshold intensity is an indication of a more complex property of the rainfall called multifractality: a large-scale rain-field is successively broken into smaller and smaller eddies, each receiving an amount of the total field specified by a multiplicative parameter. Circumstantial evidence indicates, moreover, that the significant secular decreases of D over the Mediterranean area can be reasonably related to the simultaneous coherent decrease of zonal atmospheric circulation.
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页码：73 / 78
页数：5
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