关键词: 山脉重力波, 多层模式, 大气船波, 发散模态, 拦截模态

Abstract: Characteristics of non-linear mountain gravity waves and atmospheric ship waves generated by three-dimensional multi-layer flow over an isolated mountain were investigated using the numerical model, ARPS. Results show that the transverse and diverging modes of atmospheric ship waves generated by two layer flow over an isolated mountain are the same as that of mountain gravity waves in linear models. However, non-linear mountain gravity waves and atmospheric ship waves generated by three-dimensional three-layer flow over an isolated mountain show completely different characteristics from linear mountain gravity waves. In the nonlinear case, due to non-linear interactions there exist two ship waves involving in two diverging modes on the lee side, which propagate downstream. These ship wave modes have more complex wave characteristics compared with that in two layer and linear models.

Key words: mountain gravity waves, multi-layered model, atmospheric ship waves, diverging waves, transverse waves