EAS212 Lecture Notes - Lecture 10: Angular Velocity, Northern Hemisphere, Coriolis Force

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Axis of rotation = line between the poles. Its changing its distance to the axis of rotation the poles. At a certain latitude, angular momentum = the angular velocity times the square of the distance to the axis of rotation. Angular momentum is conserved in rotating systems (ex: earth) If i am moving north in northern hemisphere, my distance to the pole is decreasing. Therefore, deflection to the east occurs: coriolis force comes from conservation of angular momentum. *this table is for n-s motion, when angle of momentum is not changing. If air moves in zonal (east-west) direction (angular velocities are taken into account. If (cid:373)o(cid:448)i(cid:374)g east(cid:449)ard, it takes less ti(cid:373)e to (cid:272)o(cid:373)plete o(cid:374)e e(cid:374)tire rotatio(cid:374) (cid:271)e(cid:272)ause it"s goi(cid:374)g faster tha(cid:374) the earth"s surfa(cid:272)e. If (cid:373)o(cid:448)i(cid:374)g (cid:449)est(cid:449)ard, opposi(cid:374)g earth"s rotatio(cid:374), takes lo(cid:374)ger to complete full rotation. Changing speed: zonal direction = angular velocity changes. Travelling to west = less than earth: motion to east in northern hemisphere:

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