Nonlinearity and finite-time instability in a T21L3 quasigeostrophic model |
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| Authors: | Zhina Jiang and Donghai Wang |
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| Affiliation: | JIANG Zhina and WANG Donghai State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,Beijing 100081 |
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| Abstract: | In this paper, a nonlinear optimization method is used to explore the finite-time instability of the atmospheric circulation with a three-level quasigeostrophic model under the framework of the conditional nonlinear optimal perturbation (CNOP). As a natural generalization of linear singular vector (SV), CNOP is defined as an initial perturbation that makes the cost function the maximum at a prescribed forecast time under certain physical constraint conditions. Special attentions are paid to the different structures and energy evolutions of the optimal perturbations. |
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| Keywords: | nonlinearity finite-time instability barotropic baroclinic |
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