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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/cp-2019-108
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-2019-108
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 27 Sep 2019

Submitted as: research article | 27 Sep 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Climate of the Past (CP).

Global aridity synthesis for the last 60 000 years

Florian Fuhrmann1, Benedikt Diensberg1, Xun Gong2, Gerrit Lohmann2, and Frank Sirocko1 Florian Fuhrmann et al.
  • 1Department for Geoscience, Johannes-Gutenberg-Universität, Mainz, 55099, Germany
  • 2Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany

Abstract. A compilation of published literature on the dust content in terrestrial and marine sediment cores are synchronised on the basis of pollen data and speleothem growth phases within GICC05 age constrain. Based on that, aridity patterns for ten key areas in the global climate system are reconstructed over the past 60 000 years. These records have different time resolutions and rely on different dating methods, thus of various types of stratigraphy. Nevertheless, all regions show humid conditions during the early MIS3 and early Holocene, but not always of the same timing. Such discrepancies have been interpreted as regional effects while also due to stratigraphical uncertainties. In comparison, the MIS2 interval becomes arid in all northern hemisphere records, but the peak arid conditions of the Last Glacial Maximum (LGM) differ in duration and intensity among regions. In addition, we also make comparisons between the aridity synthesis to modelling results using a Global Climate Model (GCM). Indeed, both lines of evidence show great agreement for the Holocene, LGM and for the late MIS intervals.

Florian Fuhrmann et al.
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Florian Fuhrmann et al.
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Short summary
Proxy data of sediment cores, speleothem, pollen and isotope data were used to reconstruct past aridity of ten regions of the world over the last 60 000 years. These regions show humid conditions during the early MIS3 (60 to 45 ka). Also the early Holocene (14 to 6 ka) was humid throughout the regions. In contrast, MIS2 (LGM ca. 18 ka) was arid in northern hemisphere records. On- and offsets of aridity/humidity differ between the regions. All this is in good agreement with recent model result.
Proxy data of sediment cores, speleothem, pollen and isotope data were used to reconstruct past...
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