Study of the Optimal Precursors for Blocking Events  

作　　者：姜治娜 罗德海 

机构地区：[1]State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid DynamicsInstitute 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 [2]Laboratory of Physical Oceanography College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266003

出　　处：《Advances in Atmospheric Sciences》2005年第3期408-414,共7页大气科学进展（英文版）

基　　金：This paper was supported by the Outstanding Youth Natural Science Foundation of China(Grant No.40325016);the Teaching and Research Award Program for Outstanding Young Teachers in Higher Education Institutions of MOE,PRC(TRAPOYT);the National Natural Science Foundation of China(Grant No.40175011).

摘　　要：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 synoptic-scale 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.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 synoptic-scale 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.

关 键 词：nonlinear optimization method dipole blocking pre-condition eddy-forcing 

分 类 号：P44[天文地球—大气科学及气象学]