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Article Dans Une Revue Climate of the Past Discussions Année : 2008

Modeling variations of marine reservoir ages during the last 45 000 years

J. Franke
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Résumé

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 ?14C 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.
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Dates et versions

hal-00298205 , version 1 (18-06-2008)

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  • HAL Id : hal-00298205 , version 1

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J. Franke, A. Paul, M Schulz. Modeling variations of marine reservoir ages during the last 45 000 years. Climate of the Past Discussions, 2008, 4 (1), pp.81-110. ⟨hal-00298205⟩

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