摘要
本文用无辐散正压涡度方程模拟非线性临界层。结果表明，在非线性临界层内，流函数场出现“Ｋｅｌｖｉｎ猫眼”现象。“猫眼”的流场呈准定常反气旋环流形势，“猫眼”的时空尺度、东移和形状变化与副热带高压有相似之处。因此，非线性临界层产生的“Ｋｅｌｖｉｎ猫眼”有可能是位于纬向东西风交界面附近的副热带高压形成的一种新的物理机制．
By a nondivergent barotropic vorticity equation,the nonlinear critical layer is simulated. The results show that in the nonlinear critical layer,a phenomenon of 'Kelvin cat's eyes' occurs in the field of stream function,having a stream field of anticyclonic circulation.The temporal and spatial scale,eastward moving and shape changing of the 'cat's eye' are similar to those of the subtropical high.It is then possible that 'Kelvin cat's eyes' produced by the nonlinear critical layer is a new physical mechanism generating the subtropical high in the vicinity of the interface betWeen zonal easterlies and westerlies.
出处
《大气科学》
CSCD
北大核心
1995年第1期73-81,共9页
Chinese Journal of Atmospheric Sciences
基金
国家自然科学基金
中国气象局气象科学基金
关键词
临界层
非线性
副热带高压
critical layer
nonlinear
subtropical high
