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Coherence resonance in an atmospheric global circulation model.
Vicente Pérez-Muñuzuri1, Roberto Deza, Klaus Fraedrich
1Group of Nonlinear Physics, University of Santiago de Compostela. E-15782 Santiago de Compostela, Spain. vicente.perez@cesga.es
Summary
Weak atmospheric noise can surprisingly enhance climate pattern regularity. Intermediate noise levels improve spatiotemporal order in vortical patterns, particularly in the summer hemisphere, impacting intra-annual climate variability.
Area of Science:
- Atmospheric Science
- Climate Modeling
- Nonlinear Dynamics
Background:
- Global circulation models simulate Earth's climate system.
- Intra-annual climate variability is influenced by atmospheric patterns.
- Stochastic processes can impact deterministic systems.
Purpose of the Study:
- To investigate the effect of weak additive Gaussian noise on atmospheric global circulation models.
- To identify coherence-resonant behavior induced by noise.
- To understand how noise influences spatiotemporal regularity of vortical patterns.
Main Methods:
- Numerical simulations using an atmospheric global circulation model.
- Introduction of white (in time and space) additive Gaussian noise with small amplitude (A << 1).
- Analysis of spatiotemporal regularity of vortical patterns under varying noise amplitudes.
Main Results:
- Evidence of coherence-resonant behavior induced by noise.
- Intermediate noise amplitudes enhance spatiotemporal regularity of vortical patterns.
- Noise primarily orders weak patterns, specifically those in the summer hemisphere.
Conclusions:
- Weak noise can induce order and enhance regularity in atmospheric circulation models.
- Coherence resonance is a mechanism by which noise can impact climate variability.
- The effect of noise is selective, ordering specific types of atmospheric patterns.