What Caused the Glacial to Interglacial CO2 Change?
Scenarios put forward to explain the 80 µatm glacial to interglacial change in atmospheric CO2 content are evaluated. The conclusion is that no single mechanism is adequate. Rather, contributions from temperature, sea ice, biologic pumping, nutrient deepening, and CаCOз cycling must be called upon. The observation that the 13C/12C ratio for Antarctic foraminifera was 0.9±0.1‰ lower during glacial than during interglacial time constitutes a huge fly in the ointment for all scenarios proposed to date.
KeywordsBenthic Foraminifera Planktonic Foraminifera North Atlantic Deep Water Glacial Time Carbon Isotope Record
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