High-Drag States and Foehns of a Two-layered Stratified Fluid past a Two-dimensional Mountain

[摘要] For a two-layered fluid with l2/l1=0.4 (l1=N1/U;l2=N2/U; N1 and N2 are Brunt-Vaisala frequencies of the lower and upper layers, respectively; U, horizontal wind speed), the dependence of non-linear aspects of the flow past a two-dimensional bell-shaped mountain on (l1 h, l1 D) (h: the height of a mountain; D: the depth of the lower layer) is numerically examined, with special emphasis on high-drag states and foehns, using a 2-dimensional non-hydrostatic model.The flow in a high-drag state is generally characterized by the large downward displacement of the air and strong downslope wind with hydraulic jump on the lee side. For π/2

[学科分类] 大气科学