[MR4D]

I notice in your second link that West Antarctica is the biggest contributor to rising global sea level.

Yet according to JPL, the main cause of this is believed to be volcanic activity under the western side of the continent. [0]

The best quote from the article was this: "I didn't see how we could have that amount of heat and still have ice on top of it."

[0] - https://www.jpl.nasa.gov/news/news.php?feature=6996

[partiallypro]

I was under the impression that the biggest contributor is actually just the rising temperature of the water, because water expands as it heats.

[Tomminn]

The average depth of the ocean is about 4km, so a thermal expansion of 1x10^(-4) per degree C (right order of magnitude), would result in about a 4m rise per degree increase in average ocean temperature. Which is obviously significant.

One of the issues with this theory is that the average temperature of the ocean is below 4 deg C, and in this regime the coefficient of expansion is negative. So we might actually see a small sea level drop due to ocean warming.

[fullarr]

While there is probably a slight amount of expansion in liquid water from heat, water expands most when frozen solid. this is the entire reason ice floats

[partiallypro]

Half of all recent sea level rises have been from thermal expansion of water: https://www.nationalgeographic.com/environment/global-warmin...