Optimal Perturbations Triggering Weather Regime Transitions:Onset of Blocking and Strong Zonal Flow
文献类型：CNKI期刊论文
| 作者 | Jiang ZN(姜智娜); Mu M(穆穆); Wang DH(王东海) |
| 发表日期 | 2011-01-15 |
| 出处 | Advances in Atmospheric Sciences
 |
| 关键词 | linear approximation, symmetry, nonlinearity, asymmetry |
| 英文摘要 | In this paper, the approach proposed by Mu and Jiang (2008) to obtain the optimal perturbations for triggering blocking (BL) onset is generalized to seek the optimal perturbations triggering onset of the strong zonal flow (SZF) regime. The BL and SZF regimes are characterized by the same dipole-like anomaly pattern superposed on the climatological flow, but with opposite sign. The results show that this method is also superior at finding the initial optimal perturbations triggering onset of the SZF regime, especially in the medium range. Furthermore, by comparing the two kinds of conditional nonlinear optimal perturbations (CNOPs) trig-gering onset of BL and SZF regimes, we find that in the linear approximation, there is symmetry in the sensitivities for BL and SZF onset, and the perturbations that optimally trigger onset of BL and SZF regimes at times when linear approximation is valid are also characterized by the same spatial pattern but with opposite sign. Whereas when the optimization time is extended to 6 days, the two kinds of CNOPs lose their out-of-phase behavior. The nonlinearity results in an asymmetry between the sensitivity for BL and SZF onset. Additionally, we find that the optimal perturbations have one common property, which is that the second baroclinic mode contributes more to the initial perturbations while the barotropic mode dominates the final structures. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | supported by the National Natural Science Foundation of China (Grant Nos 40905023 and 40633016) ; the State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences Program for Basic Research of China (No2008LASWZI01) |
| 卷 | v.28期:01页:61-70 |
| 语种 | 英文; |
| 分类号 | P433.2 |
| ISSN号 | 0256-1530 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/191814]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.StateKeyLaboratoryofSevereWeather,ChineseAcademyofMeteorologicalSciences 2.KeyLaboratoryofOceanCirculationandWave,InstituteofOceanology,ChineseAcademyofSciences 3.StateKeyLaboratoryofNumericalModelingforAtmosphericSciencesandGeophysicalFluidDynamics,InstituteofAtmosphericPhysics,ChineseAcademyofSciences |
| 推荐引用方式 GB/T 7714 | Jiang ZN,Mu M,Wang DH. Optimal Perturbations Triggering Weather Regime Transitions:Onset of Blocking and Strong Zonal Flow. 2011. |
入库方式： OAI收割
来源：海洋研究所
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