Climate change, along with the associated ice-shelf melting, contributes to sea level rise. However, the calculations linking the temperature records with ice melt leave an unexplained 12 cm/century rise in the actual levels - as measured around the world by tide gauges (and recently by satellite radar). Put another way, the levels are rising 3 to 4 times faster than can currently be explained.
This anomaly, called the Attribution Problem by geo-scientists, has been the subject of intense debate. There are various theories revolving around the general observation that : “either the tide gauge estimates are too high, as has been suggested recently, or one (or both) of the mass and volume estimates is too low.”
A new theory (2015) suggests the idea that the anomalies may be caused by changes in the size of the Earth itself.
Major effects on sea-level could come from ongoing relaxation of curvature variations that are peculiar for an expanding globe.“
Source :Sea Level Enigmatic Rising : New Perspectives from an Expanding Globe
Further reading : The Puzzle of Global Sea-Level Rise in Physics Today, Volume 55, Issue 3.
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