Question

the atmospheric pressure at a place depends on its

Answer 1

The atmospheric pressure depends on the total weight of the overlying air.

Answer 2

The atmospheric pressure depends on the total weight of the overlying air. That weight depends on the gravitational acceleration gg, the air density ρairρair (which varies with height, place and time as the winds move air of different densities around) and the height hh of the air column above (almost all of the atmosphere's mass is contained in the first 30 km or so above us, so using that height is not a bad approximation).

So if gg is constant and you're standing at a fixed place on the Earth's surface, the pressure depends on the variability of the weather systems at that place, for example winter storms passing by over you bringing colder (hence heavier) polar air.

These are the factors on which the hydrostatic part of the pressure (ρairghρairgh) depends on. That should account for the bulk of the total atmospheric pressure most of the time.




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