| Study of the Optimal Precursors for Blocking Events |
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| 作者姓名： | JIANG Zhin LUO Dehai |
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| 作者单位： | [1]StateKeyLaboratoryofNumericalModelingforAtmosphericSciencesandGeophysicalFluidDynamics,InstituteofAtmosphericPhysics,ChineseAcademyofSciences,Beijng100029 [2]LaboratoryofPhysicalOceanography,CollegeofPhysicalandEnvironmentalOceanography,OceanUniversityofChina,Qingdao266003 |
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| 基金项目： | the Outstanding Youth Natural Science Foundation of China，高等学校优秀青年教师教学科研奖励计划，国家自然科学基金，The authors would like to thank Professor Mu Mu for guidance in this work during the visit of the first author to the Institute of Atmospheric Physics，The authors are grateful to the two anonymous reviewers for their comments and suggestions |
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| 摘 要： | The precursors of dipole blocking are obtained by a numerical approach based upon a quasi-geostrophic barotropie planetary- to synoptic-scale interaction model without topography and with a localized synopticscale wave-maker. The optimization problem related to the precursors of blocking is formulated and the nonlinear optimization method is used to examine the optimal synoptic-scale initial field successfully. The results show that the prominent characteristics of the optimal synoptic-scale initial field are that the synoptic-scale wave train structures exist upstream of the incipient blocking. In addition, the large-scale low/high eddy-forcing pattern upstream of the incipient blocking is an essential precondition for the onset of dipole blocking.
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| 关 键 词： | 非线性优化 偶极堵塞 旋转力 地转风正压 大气循环 |
Study of the optimal precursors for blocking events |
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| JIANG Zhin,LUO Dehai.Study of the Optimal Precursors for Blocking Events[J].Advances in Atmospheric Sciences,2005,22(3):408-414. |
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| Authors: | Jiang Zhina Luo Dehai |
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| Institution: | State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijng 100029;Graduate School of the Chinese Academy of Sciences, Beijing 100039;Laboratory of Physical Oceanography, College of Physical and Environmental Oceanography,Ocean University of China, Qingdao 266003,Laboratory of Physical Oceanography, College of Physical and Environmental Oceanography,Ocean University of China, Qingdao 266003 |
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| Abstract: | The precursors of dipole blocking are obtained by a numerical approach based upon a quasi-geostrophic barotropic planetary- to synoptic-scale interaction model without topography and with a localized synopticscale wave-maker. The optimization problem related to the precursors of blocking is formulated and the nonlinear optimization method is used to examine the optimal synoptic-scale initial field successfully. The results show that the prominent characteristics of the optimal synoptic-scale initial field are that the synoptic-scale wave train structures exist upstream of the incipient blocking. In addition, the large-scale low/high eddy-forcing pattern upstream of the incipient blocking is an essential precondition for the onset of dipole blocking. |
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| Keywords: | nonlinear optimization method dipole blocking pre-condition eddy-forcing |
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