地面高压上空 W>0 V2d+f口0; Warm advection P ×0.v口0 W<0 Schematic 500hPa contours( thin solid li 0mm,wd sh Cold advection 地面低压 B项 W ap S VII (dashed lines)and surface fronts(heavy lines ) indicating regions of strong vertical motions due to temperature advectionw ‡0 w M0 Schematic 500hPa contours (thin solid lines), 1000hPa contours (dashed lines) and surface fronts(heavy lines) indicating regions of strong vertical motions due to temperature advection 0, 0 0; 1 2 0 ‡ M M ˆ w f f V p g ω φ ⎟⎟⎠⎞ ⎜⎜⎝⎛ ⎟⎟⎠⎞ ⎜⎜⎝⎛ ⋅∇ ∇ + ∂∂ 地面低压上空 地面高压上空 0, 0 0; 1 2 0 M ‡ ‡ ˆ w f f V p g ω φ ⎟⎟⎠⎞ ⎜⎜⎝⎛ ⎟⎟⎠⎞ ⎜⎜⎝⎛ ⋅∇ ∇ + ∂∂ B项