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Data

This folder contains the data used in the analysis.

Data newly published with this analysis are 10 yr resolution data sets of all parameters used in this study such as Na concentrations, Ca concentrations, water d18O and annual layer thickness for NGRIP and Na and Ca concentrations for NEEM. These can be found in the files 'NEEM_10yr.csv' and 'NGRIP_10yr.csv'. Both data sets reach back to 60 ka BP.

Furthermore sub directory 'ramp_data' contains the data used for the individual fits as described in more detail in the respective README. This data has higher temporal resolution than the longer time series as permitted by the individual method resolutions.

For details on the individual methods refer to the supplement of the manuscript.

Previously published data

The analysis also relies on previously published data such as

  • GICC05 age model for NGRIP (for ages and layerthickness)
  • 5 cm resolution d18O data from NGRIP
  • GICC05 age model for NEEM (for ages)

For details refer to the individual references references below

References

NGRIP members. 2004. “High-Resolution Record of Northern Hemisphere Climate Extending into the Last Interglacial Period.” Nature 431 (7005): 147–51. doi:10.1038/nature02805.

Svensson, Anders, K K Andersen, Matthias Bigler, H B Clausen, Dorthe Dahl-Jensen, S M Davies, Sigfus J Johnsen, et al. 2008. “A 60 000 Year Greenland Stratigraphic Ice Core Chronology.” Climate of the Past 4 (1): 47–57. doi:10.5194/cp-4-47-2008.

Rasmussen, Sune Olander, Peter M Abbott, Dorthe Dahl-Jensen, Thomas Blunier, A J Bourne, E Brook, S L Buchardt, et al. 2013. “A First Chronology for the North Greenland Eemian Ice Drilling (NEEM) Ice Core.” Climate of the Past 9 (6). Copernicus GmbH: 2713–30. doi:10.5194/cp-9-2713-2013.

Rasmussen, Sune O, Matthias Bigler, Simon P Blockley, Thomas Blunier, Susanne L Buchardt, Henrik B Clausen, Ivana Cvijanovic, et al. 2014. “A Stratigraphic Framework for Abrupt Climatic Changes during the Last Glacial Period Based on Three Synchronized Greenland Ice-Core Records: Refining and Extending the INTIMATE Event Stratigraphy.” Quaternary Science Reviews 106 (December): 14–28. doi:10.1016/j.quascirev.2014.09.007.