期刊
CHAOS
卷 24, 期 2, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4882376
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资金
- Institut de Recherche pour le Developpement (IRD)
- Centre National d'Etudes Spatiales (CNES)
- Les Enveloppes Fluides et l'Environnement (LEFE) program of the Institut National des Sciences de l'Univers (INSU)
The dynamics underlying cereal crops in the northern region of Morocco is investigated using a global modelling technique applied to a vegetation index time series derived from satellite measurements, namely, the normalized difference vegetation index from 1982 to 2008. Two three-dimensional chaotic global models of reduced size (14-term and 15-term models) are obtained. The model validation is performed by comparing their horizons of predictability with those provided in previous studies. The attractors produced by the two global models have a complex foliated structure-evidenced in a Poincare section-rending a topological characterization difficult to perform. Thus, the Kaplan-Yorke dimension is estimated from the synthetic data produced by our global models. Our results suggest that cereal crops in the northern Morocco are governed by a weakly dissipative three-dimensional chaotic dynamics. (C) 2014 AIP Publishing LLC.
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