17_abruptclimatechange

17_abruptclimatechange - Deglaciation Coincided ~ with...

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Deglaciation Coincided ~ with maximum summer insolation for Northern high latitudes Timing defined by Fairbanks (1989) and Bard (1990) using corals (Barbados) 14 C (too young) vs. Th/U ages Started about 19 ky, minimum ice at 6 ky
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Deglaciation Ruddiman 13-3
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Deglaciation Deglacial 2 step Ruddiman 14-4, from Fairbanks (1989) and Bard (1990) Melting 4-5X faster during meltwater pulses
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Greenland Ice Core Record (GISP2) Younger Dryas
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Younger Dryas- cooling event ~11.7 ky Named for Arctic flower that readvanced in Europe Dryas octopetala Return of conditions similar to LGM- not quite as extreme Younger Dryas
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Younger Dryas ~ 7°C cooler in North Atlantic Advance of Polar Front (to almost 45°) Changes in vegetation Drier/Dustier Decrease in ice accumulation rates GISP/GRIP Small advance in ice sheets (not a clear ice volume event) Climate signal in Greenland Ice Sheets Changes in deep circulation (MOC)
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Younger Dryas Centered in North Atlantic, but much more widespread Tree ring studies- western US Tropical Indian Ocean- cooling (Bard) Florida Lakes (Pollen; Grimm et al.) Pacific circulation (Kennett and Ingram, 1995) Drying in North Africa Advance of mtn glaciers- New Zealand
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Younger Dryas AA Cold Reversal Piotrowski et al., 2005 During deglacial warming and cooling out of sync between hemispheres
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17_abruptclimatechange - Deglaciation Coincided ~ with...

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