Onset of sahelian drought viewed as a fluctuation‐induced transition
作者:
G. R. Demaree,
C. Nicolis,
期刊:
Quarterly Journal of the Royal Meteorological Society
(WILEY Available online 1990)
卷期:
Volume 116,
issue 491
页码: 221-238
ISSN:0035-9009
年代: 1990
DOI:10.1002/qj.49711649110
出版商: John Wiley&Sons, Ltd
数据来源: WILEY
摘要:
AbstractA statistical analysis of representative sets of rainfall data in the west Sahel region is performed and a jump transition in the late sixties is detected. It is suggested that the main features associated with the record can be accounted for by a fluctuation‐induced transition between two stable precipitation regimes: a ‘humid’ and a ‘dry’ state. A minimal model involving the dominant nonlinearities is constructed and its parameters determined from the data. an attempt is made to arrive at a statistical prediction of the duration of the alternate regimes through the relative stability of the two stable states as deduced from mean values and higher moments of residence times. the behaviour predicted by the model is in good qualitative agreement with t
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