Greenland dating

Posted by / 15-Nov-2018 03:25

Greenland dating

A recent radiocarbon dating study of earthworm granules from soils in a loess site in Germany points to a link between Greenland climate and soil formation in western European loess (29).Although this highlights the potential of radiocarbon dating of loess, it is not clear whether the inferred precipitation changes in that study are accompanied by shifts in dust accumulation, crucial to understanding past dustiness.Several mechanisms behind these abrupt climatic changes have been proposed, including ocean circulation (7), sea ice cover–ice sheet (8, 9), and wind pattern changes (10).The effects of D-O events extended across much of the Northern Hemisphere (11) and were identified in precisely dated terrestrial records such as speleothems in Europe and Asia (12–15).

2 and 3).) The 2-sigma age model (or counting) uncertainties of the displayed records.However, changes in climate and dustiness in potential dust-emitting source regions are less well understood at millennial scales (16).Furthermore, recent isotopic and clay mineral evidence from Northern Hemisphere loess deposits reopened the debate about the origins of Greenland dust, as both East Asian and European dust sources are compatible with current Greenland dust data (17).Atmospheric dust is a major component of climate change.However, the relationship between glacial continental dust activity and abrupt centennial–millennial-scale climate changes of the North Atlantic is poorly known.

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Atmospheric mineral dust (hereafter called dust) plays a major but poorly understood role in the climate system, both responding to and driving climate change (1).