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CellBioGuy comments on Open thread, Nov. 02 - Nov. 08, 2015 - Less Wrong Discussion
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http://www.worldviewofglobalwarming.org/images11/SeaLevelRiseRateChart2010.jpg
This is the global mean. Rise measured at any given actual shoreline will be different and sometimes even falling, due to local geology altering elevations of land at not-dissimilar rates in some areas (especially areas where post-glacial rebound is still occurring) as well as thermal expansion being uneven.
Was something weird happening in the 1920s or is it just an optical illusion due to the black lines?
I think you'd see similar anomalies in 1880 and 1985 stand out with similar lines.
Yes. But the sea levels have been rising continuously since the time of the last glacial maximum. 10,000 years ago they were rising at a rather more dramatic rate, too.
Yep! My favorite bit of what went on during the end of the last glaciation is the way that it happened unevenly, a sedate constant flow of water from ice to the oceans interrupted by centuries here and there where sea level rose by at least 2-5 centimeters a year. Presumably that's what happens once an ice sheet becomes unstable and pieces of them collapse quickly and nonlinearly.
That was one of those "interesting times to live in"? Still it's peanuts compared to the mother of all floods :-)