This figure which is courtesy
of IGBP/PAGES shows snow accumulation and isotopically inferred temperature
records in the Greenland GISP2 ice core and a temperature record derived
from oxygen isotope measurements of fossil shells in the sediments of
Lake Ammersee, southern Germany. These records all show a major climatic
instability event which occurred around 8200 years ago, during the Holocene.
The event was large both in magnitude, as reflected by a temperature
signal in Greenland of order 5 °C, and in its geographical extent,
as indicated by the close correlation of the signal in these two locations.
The dramatic event is also seen in the methane record from Greenland
indicating possible major shifts in hydrology and land cover in lower
latitudes. source: VonGrafenstein et al (1998) Climate Dynamics, 14,
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