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Advances in Atmospheric Sciences

, Volume 22, Issue 3, pp 408–414 | Cite as

Study of the optimal precursors for blocking events

  • Jiang Zhina
  • Luo Dehai
Article

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.

Key words

nonlinear optimization method dipole blocking pre-condition eddy-forcing 

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Copyright information

© Advances in Atmospheric Sciences 2003

Authors and Affiliations

  • Jiang Zhina
    • 1
    • 2
    • 3
  • Luo Dehai
    • 3
  1. 1.State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijng
  2. 2.Graduate School of the Chinese Academy of SciencesBeijing
  3. 3.Laboratory of Physical Oceanography, College of Physical and Environmental OceanographyOcean University of ChinaQingdao

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