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4
The question may generate primarily opinion based answers but while it is open one would like to present the following information.
At the outset most of the people I know in the field work in NWP and the reason people avoid higher mathematics(by that I mean looking for analytical solutions or pure math based projects such as you mention topology or ...
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Short answer because there was no ice cap there.
Why does the hudson bay have lower gravity, isostatic rebound, there used to be an icecap right there, several miles of ice. That pushed the continental crust further down in to the mantle, like a boat with a heavy load. Mantle is denser than continental crust. When the icecap melted the rock started to ...
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Wolfram Alpha reports values between 9.78 and 9.88 m/s^2 depending on the location, which is odd because it should stay within the range 9.76 - 9.83 all over the world. It also seems to be using the ocean floor as a reference elevation if the point falls in water.
Using Natural Resources Canada's tool, it reports a gravity of 981933.3 mGal (9.819333 m/s^2) ...
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