Climate of the Past www.clim-past.net 1814-9324 1814-9332 4 2 2008 10.5194/cp-4-125-2008 http://www.clim-past.net/4/125/2008/ http://www.clim-past.net/4/125/2008/cp-4-125-2008.html http://www.clim-past.net/4/125/2008/cp-4-125-2008.pdf 125 136 2008-06-25 Modeling variations of marine reservoir ages during the last 45 000 years J. Franke joerg.franke@palmod.uni-bremen.de A. Paul M. Schulz Department of Geosciences, University of Bremen, Germany MARUM – Center for Marine Environmental Sciences, University of Bremen, Germany When dating marine samples with ¹⁴C, the reservoir-age effect is usually assumed to be constant, although atmospheric ¹⁴C production rate and ocean circulation changes cause temporal and spatial reservoir-age variations. These lead to dating errors, which can limit the interpretation of cause and effect in paleoclimate data. We used a global ocean circulation model forced by transient atmospheric Δ¹⁴C variations to calculate reservoir ages for the last 45 000 years for a present day-like and a last glacial maximum-like ocean circulation. A ~30% reduced Atlantic meridonal overturning circulation leads to increased reservoir ages by up to ~500 years in high latitudes. Temporal variations are proportional to the absolute value of the reservoir age; regions with large reservoir age also show large variation. Temporal variations range between ~300 years in parts of the subtropics and ~1000 years in the Southern Ocean. For tropical regions, which are generally assumed to have nearly stable reservoir ages, the model suggests variations of several hundred years. Austin, W. E N., Bard, E., Hunt, J B., Krooni, D., and Peacock, J D.: The $^14$C age of the Icelandic Vedde ash: Implications for Younger Dryas marine reservoir age corrections, Radiocarbon, 37, 53–62, 1995. 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