x y z 1.Smaller-scale convection : GEOSTROPHY BREAKS DOWN Observations for small-scale convection: Velocity U-V: 20 m/s; Time T (100-1000s)= S
Acceleration term: Coriolis term: Therefore, the Coriolis term can be NEGLECTED! Geostrophy breaks down! 0
2. The vertical equation of motion In z direction: Newton’s second law of motion for unit mass: negligible Free atmosphere negligible Large-scale motion, T: 1day; W:10m/s: Even for T=1000s,
Hydrostatic balance Hydrostatic balance is well satisfied even by mesoscale convection. Exercise: find out for what scale convection (vertical velocity and timescale), hydrostatic balance can break down.