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• W2071972689 abstract "Climate models provide estimates of climatic change over periods of time in the ancient past. Macrophysical climate models (MCM) differ from the more widely used general circulation models (GCM), in that MCMs provide temporally high-resolution (~ 100 years) and site-specific estimations of monthly values of climate variables such as temperature and precipitation. In this paper, seasonal changes in climate variables are modeled for six 14 C-dated fossil localities in North America. Five of these localities represent the time of maximum extent of ice during the most recent glacial episode, the Full Glacial (25 + –15 ka), including one at the peak of the Last Glacial Maximum (17–15 ka). The other locality represents the time as the ice began to recede, the Late Glacial (15–11 ka). Seasonal variations in temperature and precipitation modeled by MCM are herein compared with interpretations of seasonal variation based upon oxygen isotopes from serially sampled hypsodont teeth (mostly Equus and Bison ) collected from each of these localities. Additionally, the MCM-modeled seasonal variations are used to predict the expected abundances of different plant functional groups (PFG) during those times, especially C3 and C4 functional groups, using modern relationships. These predictions are compared with carbon isotopic values from the same teeth. The importance of atmospheric p CO 2 for the relative abundance of plants utilizing the C4 metabolic pathway is discussed, given that glacial episodes are known to have been times of lower atmospheric p CO 2 . Interpretations of seasonal variability and the relative abundance of C3 versus C4 vegetation based upon isotopes from tooth enamel are in broad agreement with predictions using the MCM and the modern distribution of PFGs with climate variables. The influence of p CO 2 on the distribution of C4 vegetation during glacial times appears to be negligible." @default.
• W2071972689 created "2016-06-24" @default.
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• W2071972689 date "2009-12-01" @default.
• W2071972689 modified "2023-09-27" @default.
• W2071972689 title "Seasonal and geographic climate variabilities during the Last Glacial Maximum in North America: Applying isotopic analysis and macrophysical climate models" @default.
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• W2071972689 doi "https://doi.org/10.1016/j.palaeo.2009.08.015" @default.
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