(NAS Colloquium) Carbon Dioxide and Climate Change (1997) / Chapter Skim
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Keeling, held November 13-15, 1995, at the National Academy of Sciences, Irvine, CA. Characteristics of the deep ocean carbon system during the past 150,000 years: SCOT distributions, deep water flow patterns, and abrupt climate change EDWARD A
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1. Schematic diagram of global deep water circulation during the LGM.
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(30) , a shallower variety of North Atlantic deep water will have a more difficult time reaching high latitudes of the Southern Ocean where it can be recycled into the bottom water.
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showed that surface and deep water properties are punctuated by a series of at least four millennialscale events. The most recent of these events is the "Younger Dryas" cooling, which occurred 13,000-11,500 calendar years ago, where both benthic Cd and 8~3C indicate a strong and clear diminution of the percentage of low-iCO2 lower NADW.
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8304 Colloquium Paper: Boyle marked by a strong decrease in %CaCO3 (as on the transition between LGM and Holocene)
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Colloquium Paper: Boyle Z-OQPI1YCUS unstable sulfide band 1 000 cm 1050 cm ~ .
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(ice cores being plotted on time scales developed by the authors of refs.
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Concluding Remarks Me quest for uncovering the LGM SCOT distribution and its link to deep ocean circulation changes has made significant progress in the Atlantic, northern Indian, and eastern tropical Pacific oceans, but the quest is still stalled regarding the Southern Ocean and the northwest Pacific. The temporal variability of SCOT and circulation in the North Atlantic is becoming evident, with long-term Milankovitch orbital links as well as century- to millennial-scale variability that may be linked to events seen in Greenland ice cores.
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