You got that bass-ackwards, Jake. Ice below the surface won't add to the total volume, it'll shrink. This is because the crystalline lattice configuration of the ice gives it more volume than the same volume of liquid water. That's why ice floats. Ice above the water's surface will melt and add volume, but lesser volume added than that above the surface in solid form. If the ice was in the water to start with, it might not add, but ice falling from land will add volume.
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