Universal Spectrum for Natural Variability of Climate: Implications for Climate Change

• Published in: arXiv.org
• Main Authors: Pethkar, J S, Selvam, A M
• Format: Paper
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 31.05.2001
• Subjects: Atmospheric models; Climate change; Climate models; Computational fluid dynamics; Computer simulation; Dynamical systems; Fractal geometry; Fractals; Iterative methods; Numerical integration; Power spectra; Roundoff error; Scale invariance; Self-similarity; Similarity; Variation; Weather forecasting
• ISSN: 2331-8422

The apparantly irregular (unpredictable) space-time fluctuations in atmospheric flows ranging from climate (thousands of kilometers - years) to turbulence (millimeters - seconds) exhibit the universal symmetry of self-similarity. Self-similarity or scale invariance implies long-range spatiotemporal correlations and is manifested in atmospheric flows as the fractal geometry to spatial pattern concomitant with inverse power-law form for power spectra of temporal fluctuations. Long-range spatiotemporal correlations are ubiquitous to dynamical systems in nature and are identified as signatures of self-organized criticality. Standard meteorological theory cannot explain satisfactorily the observed self-organized criticality. Numerical models for simulation and prediction of atmospheric flows are subject to deterministic chaos and give unrealistic solutions. Deterministic chaos is a direct consequence of round-off error growth in iterative computations. Round-off error of finite precision computations doubles on an average at each step of iterative computations. Round-off error will propagate to the mainstream computation and give unrealistic solutions in numerical weather prediction (NWP) and climate models which incorporate thousands of iterative computations in long-term numerical integration schemes. A recently developed non-deterministic cell dynamical system model for atmospheric flows predicts the observed self-organized criticality as intrinsic to quantumlike mechanics governing flow dynamics.