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

G. Lohmann, A. Wackerbarth, P. M. Langebroek, M. Werner, J. Fohlmeister, D. Scholz, A. Mangini
2013 Climate of the Past  
<p><strong>Abstract.</strong> A synthetic stalagmite &amp;delta;<sup>18</sup>O 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 &amp;delta;<sup>18</sup>O values. Mixing processes in the soil and karst above the cave represent a natural low-pass filter of the speleothem climate archive. Stalagmite
more » ... &amp;delta;<sup>18</sup>O values at Bunker Cave lag the regional surface climate by 3–4 yr. The power spectrum of the simulated speleothem calcite &amp;delta;<sup>18</sup>O 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.</p>
doi:10.5194/cp-9-89-2013 fatcat:u2poo4fb7fesparwkjadtgpzv4