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The climatic controls on the stable carbon isotopic composition (d13C) ofspeleothem carbonate are less often discussed in the scientific literature incontrast to the frequently used stable oxygen isotopes. Various local processesinfluence speleothem d13C values and confident and detailed interpretations ofthis proxy are often complex. A better understanding of speleothem d13C valuesis critical to improving the amount of information that can be gained fromexisting and future records. This contribution aims to disentangle the variousprocesses governing speleothem d13C values and assess their relativeimportance. Using a large data set of previously published records we examinethe spatial imprint of climate-related processes in speleothem d13C valuesdeposited post-1900 CE, a period during which global temperature and climatedata is readily available. Additionally, we investigate the causes fordifferences in average d13C values and growth rate under identical climaticconditions by analysing pairs of contemporaneously deposited speleothems fromthe same caves. This approach allows to focus on carbonate dissolution andfractionation processes during carbonate precipitation, which we evaluate usingexisting geochemical models. Our analysis of a large global data set of recordsreveals evidence for a temperature control, likely driven by vegetation andsoil processes, on d13C values in recently deposited speleothems. Moreover,data-model intercomparison shows that calcite precipitation occurring alongwater flow paths prior to reaching the top of the speleothem can explain thewide d13C range observed for concurrently deposited samples from the same cave.We demonstrate that using the combined information of contemporaneously growingspeleothems is a powerful tool to decipher controls on d13C values ...

Main Controls on the Stable Carbon Isotope Composition of Speleothems