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    Please help on geopotential gradient and geostrophic wind?

    If a geostrophic wind of 30 m/s is observed in Christchurch, then what is the geopotential gradient in m/km at 500hPa required to maintain this wind? I tried to solve it by assuming that the geopotential gradient is the ratio of the geopotential height. Let P = 500 hPa = 500 x 10^2 Pa, R =...
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