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| Titel |
A model of coupled oscillators applied to the aerosol–cloud–precipitation system |
| VerfasserIn |
G. Feingold, I. Koren |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 20, no. 6 ; Nr. 20, no. 6 (2013-11-25), S.1011-1021 |
| Datensatznummer |
250086075
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| Publikation (Nr.) |
 copernicus.org/npg-20-1011-2013.pdf |
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| Zusammenfassung |
| We simulate the aerosol–cloud–precipitation system as a collection of cloud
elements, each coupled through physically based interactions with adjacent
clouds. The equations describing the individual clouds follow from the
predator–prey model of Koren and Feingold (2011) with the addition of
coupling terms that derive from the flow of air between the components
resulting from surface divergence or convergence of flows associated with the
life cycle of an individual cell. It is shown that some degree of coupling
might stabilize clouds that would ordinarily become unstable. Varying the
degree of coupling strength has significant influence on the system. For weak
coupling, the clouds behave as independent oscillators with little influence
on one another. As the local coupling strength increases, a point is reached
at which the system becomes highly synchronized, similar to the Sakaguchi et
al. (1987) model. Individual cloud oscillators in close proximity to one
another can be both in-phase or out-of-phase depending on the choice of the
time constant for the delay in communication between components. For the case
considered, further increases in coupling strength result in reduced order
and eventually unstable growth. Finally it is demonstrated that the set of
coupled oscillators mimics qualitatively the spatial structure and
synchronized behaviour of both closed and open-cellular cloud fields observed
in satellite imagery, and produced by numerically intensive large eddy
simulation. |
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