Investigating stable oxygen and carbon isotopic variability in speleothem records over the last millennium using multiple isotope-enabled climate models
Janica C. Bühler,Josefine Axelsson,Franziska A. Lechleitner,Jens Fohlmeister,Allegra N. LeGrande,Madhavan Midhun,Jesper Sjolte,Martin Werner,Kei Yoshimura,and Kira Rehfeld
Department of Chemistry, Biochemistry and Pharmaceutical Sciences and Oeschger Centre for Climate Change Research, University of Bern, 3012 Bern, Switzerland
Jens Fohlmeister
Federal Office for Radiation Protection, 10318 Berlin, Germany
Section “Climate Dynamics and Landscape Development”, GFZ German Research Centre for Geosciences, 14473 Potsdam, Germany
Allegra N. LeGrande
NASA Goddard Institute for Space Studies and Center for Climate Systems Research, Columbia University, New York, NY, USA
Madhavan Midhun
Department of Atmospheric Sciences, Cochin University of Science and Technology, Kochi, Kerala 682016, India
Earth Research Institute, University of California Santa Barbara, Santa Barbara, CA, USA
We collected and standardized the output of five isotope-enabled simulations for the last millennium and assess differences and similarities to records from a global speleothem database. Modeled isotope variations mostly arise from temperature differences. While lower-resolution speleothems do not capture extreme changes to the extent of models, they show higher variability on multi-decadal timescales. As no model excels in all comparisons, we advise a multi-model approach where possible.
We collected and standardized the output of five isotope-enabled simulations for the last...