Department of incredible graphs: the rise in sea level over the last 20,000 or so years, with (until very recently) a major interregnum: https://en.wikipedia.org/wiki/Meltwater_pulse_1A …pic.twitter.com/e9CU6DDBau
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Department of incredible graphs: the rise in sea level over the last 20,000 or so years, with (until very recently) a major interregnum: https://en.wikipedia.org/wiki/Meltwater_pulse_1A …pic.twitter.com/e9CU6DDBau
The really amazing bit is the very steep rises: the big meltwater pulses. Meltwater Pulse 1A happened ~14k years ago. It saw sea level rise 16-25 meters over 400-500 years.
That's about 5 cm per year, or ~1 meter every 20 or so years(!!!) It's ~20x faster than the rate of sea level rise over the 20th C. In perspective: if the same rate happened today, the Bangladesh Plain, home to ~100m people, would almost entirely vanish in a few generations
I gather that scientists don't yet understand very well what caused the big meltwater pulses. In some cases, much is known about proximate causes - MWP 1-A seems to be related to the collapse of the Laurentide ice sheet, and melting of part of Antarctica.
But what causes those things? In some sense all these huge surges in sea level represent tipping points passed, very big nonlinear events & positive feedback effect in the climate / cryosphere.
Many of those positive feedbacks still seem to very poorly understood. One naturally wonders: what don't we yet know?
Related reading: James Hansen and collaborators on one striking mechanism for very rapid sea level rise: https://www.atmos-chem-phys.net/16/3761/2016/acp-16-3761-2016.pdf … And the methane clathrate gun hypothesis: https://en.wikipedia.org/wiki/Clathrate_gun_hypothesis …pic.twitter.com/MEegnyfyqC
I should say: both these still seem to be firmly in the "speculative" camp. But it's very interesting trying to understand these positive feedback effects better!
Another thing I'd like to understand better: why the modern interregnum? We saw 120 meters of sea level rise; I believe there's nearly that much water again still locked up in the cryosphere. Why the (until very recently) modern era of semi-stability?
Non-linear feedbacks for continential glaciers melting? They are mostly gone, and Greenland / Antarctica are separated by a lot of latitude from the majority of the continental glaciers (e.g. in North America) which receded and then decreased in Albedo, locally heating the area.
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