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Testing the consistency of Holocene and Last Glacial Maximum spatial correlations in temperature proxy records |
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| Authors: | Maria Reschke Igor Kröner Thomas Laepple |
| Institution: | 1. Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Telegrafenberg A45, Potsdam, 14473 Germany;2. Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Telegrafenberg A45, Potsdam, 14473 Germany
Institute of Geosciences, University of Potsdam, Karl-Liebknecht-Straße 24/25, Potsdam, 14476 Germany;3. Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Telegrafenberg A45, Potsdam, 14473 Germany MARUM – Center for Marine Environmental Sciences and Faculty of Geosciences, University of Bremen, Bremen, 28334 Germany |
| Abstract: | Holocene temperature proxy records are commonly used in quantitative synthesis and model-data comparisons. However, comparing correlations between time series from records collected in proximity to one another with the expected correlations based on climate model simulations indicates either regional or noisy climate signals in Holocene temperature proxy records. In this study, we evaluate the consistency of spatial correlations present in Holocene proxy records with those found in data from the Last Glacial Maximum (LGM). Specifically, we predict correlations expected in LGM proxy records if the only difference to Holocene correlations would be due to more time uncertainty and more climate variability in the LGM. We compare this simple prediction to the actual correlation structure in the LGM proxy records. We found that time series data of ice-core stable isotope records and planktonic foraminifera Mg/Ca ratios were consistent between the Holocene and LGM periods, while time series of Uk'37 proxy records were not as we found no correlation between nearby LGM records. Our results support the finding of highly regional or noisy marine proxy records in the compilation analysed here and suggest the need for further studies on the role of climate proxies and the processes of climate signal recording and preservation. |
| Keywords: | Holocene LGM spatial correlation temperature Uk'37 |