Abstract. A compilation of the published literature on dust content in
terrestrial and marine sediment cores was synchronized with pollen data and
speleothem growth phases on the Greenland Ice Core Chronology 2005 (GICC05) time axis. Aridity patterns for eight
key areas of the global climate system have been reconstructed for the last
60 000 years. These records have different time resolutions and different
dating methods, i.e. different types of stratigraphy. Nevertheless, all
regions analysed in this study show humid conditions during early Marine
Isotope Stage 3 (MIS3) and the early Holocene or deglaciation, but not
always at the same time. Such discrepancies have been interpreted as
regional effects, although stratigraphic uncertainties may affect some of
the proposed interpretations. In comparison, most of the MIS2 interval
becomes arid in all of the Northern Hemisphere records, but the peak arid
conditions of the Last Glacial Maximum (LGM) and Heinrich event 1 differ in
duration and intensity among regions. In addition, we also compare the
aridity synthesis with modelling results using a global climate model (GCM).
Indeed, geological archives and GCMs show agreement on the aridity pattern for
the Holocene or deglaciation, for the LGM and for late MIS3.
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.
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