TY  - JOUR
A1  - Bajnai, David
A1  - Guo, Weifu
A1  - Spötl, Christoph
A1  - Coplen, Tyler B.
A1  - Methner, Katharina
A1  - Löffler, Niklas
A1  - Krsnik, Emilija
A1  - Gischler, Eberhard
A1  - Hansen, Maximilian
A1  - Henkel, Daniela
A1  - Price, Gregory D.
A1  - Raddatz, Jacek
A1  - Scholz, Denis
A1  - Fiebig, Jens
T1  - Dual clumped isotope thermometry resolves kinetic biases in carbonate formation temperatures
T2  - Nature Communications
N2  - Surface temperature is a fundamental parameter of Earth’s climate. Its evolution through time is commonly reconstructed using the oxygen isotope and the clumped isotope compositions of carbonate archives. However, reaction kinetics involved in the precipitation of carbonates can introduce inaccuracies in the derived temperatures. Here, we show that dual clumped isotope analyses, i.e., simultaneous ∆47 and ∆48 measurements on the single carbonate phase, can identify the origin and quantify the extent of these kinetic biases. Our results verify theoretical predictions and evidence that the isotopic disequilibrium commonly observed in speleothems and scleractinian coral skeletons is inherited from the dissolved inorganic carbon pool of their parent solutions. Further, we show that dual clumped isotope thermometry can achieve reliable palaeotemperature reconstructions, devoid of kinetic bias. Analysis of a belemnite rostrum implies that it precipitated near isotopic equilibrium and confirms the warmer-than-present temperatures during the Early Cretaceous at southern high latitudes.
KW  - Biogeochemistry
KW  - Palaeoceanography
KW  - Palaeoclimate
KW  - Physical oceanography
Y1  - 2020
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/86009
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-860098
SN  - 2041-1723
N1  - Gefördert durch den Open-Access-Publikationsfonds der Goethe-Universität.
N1  - Funding: DFG ; INST 161/871-1
N1  - Funding: Investment in Science Fund at Woods Hole Oceanographic Institution
N1  - Funding: DFG ; ME 4955/1-1
N1  - Funding: DFG ; MU 2845/6-1
N1  - Funding: DFG ; SCHO 1274/8-1
N1  - Funding: DFG ; SCHO 1274/11-1
N1  - Funding: DFG ; HA 8694/1-1
N1  - The figures were generated using code written in R, available at: [https://doi.org/10.5281/zenodo.3784963]
VL  - 11
IS  - 1, art. 4005
SP  - 1
EP  - 9
PB  - Springer Nature
CY  - [London]
ER  -