The temperature record of the Holocene: progress and controversies
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摘要:
The pattern of temperature variation during the Holocene,the most recent geological epoch,has been studied intensively,partly because of its significance for the development of human civilization.Prior to the 1980s,based on ice core records in Greenland and Antarctica,the climate of the Holocene was thought to have been rather stable [1].However,this view was challenged by the discovery of a substantial amount of contrary evidence,such as the sequence of ice-rafted events in the high latitude North Atlantic which clearly reflects significant dynamic regional climate variations.In the 1980s,COHMAP (the Cooperative Holocene Mapping Project) aimed to compare well-dated paleoclimate records and model simulations [2].Later,the Holocene Thermal Maximum (HTM),a relatively warm climate phase between 11 and 5 ka,was confirmed by various proxy records and was attributed to the strengthening of summer insolation [3].