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Abstract :
[en] We construct a range of estimates for the glacial-interglacial variations of CO2 consumption and bicarbonate production rates by continental weathering processes, using two models of continental weathering in conjunction with two data sets for present-day runoff and climate results from four GCMs. Both models consistently produce 25–35% higher global CO2 consumption and 30–40% higher bicarbonate production rates at the LGM than at present-day. In terms of CO2 consumed by silicate weathering, variations calculated here are more than 2.5 times smaller than those derived from the marine Ge/Si record. Areas exposed both now and at the LGM exhibit only little change. The increased bicarbonate production (CO2 consumption) on the continental shelf exposed at the LGM overbalances the decrease due to ice cover by a factor of 3–4 (resp. 2.3–3.7). However, large uncertainties affect the fluxes in the shelf environment, as shown by sensitivity tests regarding its lithology.
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