Ref ID:	25700
Ref Type:	Book Section in a Series
Authors:	Dergachev, V. A. Geel, B. van
Title:	Large-scale periodicity of climate change during the Holocene
Date:	2004
Source:	Impact of the environment on human migration in Eurasia
Place of Publication:	Boston
Publisher:	Kluwer Academic Publishers
Abstract:	Numerous natural events documented in instrumental, historical and palaeoclimate records clearly indicate that large regions of the Earth have experienced occurrences of both slow and rapid climate change in the past. Various proxy records of long duration demonstrate distinct cyclicities from eleven years to hundreds of thousands years that have been attributed to external forcing. Until quite recently, palaeoclimatic research has tended to focus on evidence for longer-term climatic change, especially on glacial to interglacial timescales. The duration of these oscillations are varied with approximately a 1500-year periodicity and therefore not related to the Earth’ orbital variations around the Sun. After a number of cooling/warming episodes (Dansgaard-Oeschger cycles) there are terminal dramatic coolings called Heinrich events with temperature drops up to about 5°C before a major warming event. Such a cycle of warming and cooling is known as a Bond cycle with a mean duration of 2500 years. Both marine and continental sediment records confirm these rapid shifts. <p> The Holocene climate has also been a time of major climatic and environmental change, although in the current interglacial the Earth has remained at a rather steady climatic phase over the last 10,000 years in comparison with the preceding climatic phases of the last glacial cycle. From more recent studies on ice cores and marine sediments, there is evidence that the Holocene climate closely parallels that in the preceding last glacial cycle. </p>
Date Created:	6/26/2008
Editors:	Scott, E. Marian Alekseev, Andrey Yu. Zaitseva, Ganna
Page Start:	159
Page End:	183
Series Title:	NATO Science Series IV: Earth and Environmental Sciences