Why is the value of g is different in polar, equinoctial and the tropical regions?

Why is the value of g is different in polar, equinoctial, and tropical regions?

As the earth is not perfectly round, the polar regions are a bit compressed, therefore the radius of the earth R is not constant. Hence the value of g is not the same at all places on earth. The value of g is different in different places on earth. The value of g is highest in the polar region and it is 9.83217 ms-2. In the equinoctial region, it is 9.78039 ms-2 and in the tropical region, it is 9.78918 ms-2. Its value at sea level altitude of 45 degrees is accepted as the standard value. The standard value of g is 9.80665 ms-2. For convenience, the standard value of g is taken to be 9.8 ms-2 or 9.81 ms-2.

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