Simulated European stalagmite record and its relation to a quasi-decadal climate mode

Lohmann, G.; Wackerbarth, A.; Langebroek, P. M.; Werner, M.; Fohlmeister, J.; Scholz, D.; Mangini, A.

A synthetic stalagmite δ 18O record for the Bunker Cave (51° N, 7° E) is constructed using a combined climate–stalagmite modelling approach where we combine an atmospheric circulation model equipped with water isotopes and a model simulating stalagmite calcite δ 18O values. Mixing processes in the soil and karst above the cave represent a natural low-pass filter of the speleothem climate archive. Stalagmite δ 18O values at Bunker Cave lag the regional surface climate by 3–4 yr. The power spectrum of the simulated speleothem calcite δ 18O record has a pronounced peak at quasi-decadal time scale, which is associated with a large-scale climate variability pattern in the North Atlantic. Our modelling study suggests that stalagmite records from Bunker Cave are representative for large-scale teleconnections and can be used to obtain information about the North Atlantic and its decadal variability.

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Lohmann, G. / Wackerbarth, A. / Langebroek, P. M. / et al: Simulated European stalagmite record and its relation to a quasi-decadal climate mode. 2013. Copernicus Publications.

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