A barotropic envelope Rossby soliton model for block-eddy interaction. Part II: Role of westward-traveling planetary waves
A barotropic envelope Rossby soliton model for block-eddy interaction. Part II: Role of westward-traveling planetary waves
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DOI：
10.1175/3347.1
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发表时间：
2005
影响因子：
3.1
通讯作者：
D. Luo
中科院分区：
文献类型：
--
作者：
D. Luo
本文首先通过构造一个由纬向波数为2的定常偶极波和纬向波数为1或2的西行等幅行波（C波）组成的初始块体，研究了西行行星波在天气尺度涡旋与初始块体相互作用过程中对块体形成和涡旋变形的作用。结果表明，C波可以通过影响阻塞前（分流）流来影响阻塞的发生和强度，即使它不影响与天气尺度涡旋相关的偶极波的放大。由变形涡旋组织的风暴路径是否向北偏转取决于C波相对于静止偶极波的纬向波数、振幅和相位。当纬向波数为1的C波脊从北半球向西移动时，通过初始阻塞与天气尺度扰动的相互作用，可以产生一个典型的逆行阻塞反气旋。
Abstract The role of westward-traveling planetary waves in the block onset and the deformation of eddies during the interaction between synoptic-scale eddies and an incipient block is first examined by constructing an incipient block that consists of a stationary dipole wave for zonal wavenumber 2 and a westward-traveling monopole wave with constant amplitude (C wave) for zonal wavenumber 1 or 2. It is shown that the C-wave can affect the onset and strength of blocking through influencing the preblock (diffluent) flow even though it does not affect the amplification of the dipole wave associated with the synoptic-scale eddies. Whether the storm tracks organized by the deformed eddies deflect northward depends upon the zonal wavenumber, amplitude, and phase of the C wave relative to the stationary dipole wave. A typical retrograde blocking anticyclone can arise through the interaction of an incipient block with synoptic-scale perturbations when the C-wave ridge with zonal wavenumber 1 shifts westward from ...