A new global reconstruction of temperature changes at the Last Glacial Maximum
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A new global reconstruction of temperature changes at the Last Glacial Maximum
Some recent compilations of proxy data both on land and ocean (MARGO Project Members, 2009; Bartlein et al., 2011; Shakun et al., 2012), have provided a new opportunity for an improved assessment of the overall climatic state of the Last Glacial Maximum. In this paper, we combine these proxy data with the ensemble of structurally diverse state of the art climate models which participated in the...
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We used 5704 14C, 10Be, and 3He ages that span the interval from 10,000 to 50,000 years ago (10 to 50 ka) to constrain the timing of the Last Glacial Maximum (LGM) in terms of global ice-sheet and mountain-glacier extent. Growth of the ice sheets to their maximum positions occurred between 33.0 and 26.5 ka in response to climate forcing from decreases in northern summer insolation, tropical Pac...
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Multiple paleoceanographic proxies in a zonal transect across the California Current near 42øN record modern and last glacial maximum (LGM) thermal and nutrient gradients. The offshore thermal gradient, derived from foraminiferal slx•ies assemblages and oxygen isotope data, was similar at the LGM to that at present (warmer offshore), but average temperatures were 3.3 ø +1.5øC colder. Observed g...
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ژورنال
عنوان ژورنال: Climate of the Past
سال: 2013
ISSN: 1814-9332
DOI: 10.5194/cp-9-367-2013