Aridity synthesis for eight selected key regions of the global climate system during the last 60 000 years
2020
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.
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