The Last Interglacial and its climate change

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  • 最終間氷期とその気候変動について
  • サイシュウ カンピョウキ ト ソノ キコウ ヘンドウ ニ ツイテ

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The Last Interglacial is generally thought to be equivalent to the Eemian in North-West Europe and MIS 5e in the deep sea sediment stratigraphy. The Eemian is defined as the pollen zones in the borehole core at Amsterdam Terminal, ranging from 131 ka to 116 ka. As climate change during the Last Interglacial had a different duration at the different geographic positions, the Eemian should be propounded as the international time-stratigraphic unit of the beginning of the Late Pleistocene. It is, therefore, reasonable that the Last Interglacial should have a different definition from the Eemian as the warm period around 125 ka characterized by an arboreal pollen assemblage in Europe. The IPCC Fourth Assessment Report warns of temperature rises of 1.1-2.9℃ by the end of this century caused by the increasing radiation forcing of 0.6-2.4W/m2 under the B1 scenario of the Special Report on Emissions Scenarios. During the Last Interglacial the temperature increase comes from the change of radiation forcing by the Earth's orbital change, and the radiation forcing is estimated at an increase of 60W/m2 in the summer of the Arctic region instead of 0.2W/m2 as the world-wide average, which had an intense global warming effect. Many recent reports on global warming tell us that we are confronted with the most severe event which humans have ever experienced. However, climate change during the Last Interglacial was more intense than the present global warming now in operation. We should never neglect to analyse the natural factors operating in global warming and to differentiate them from anthropogenic factors, caused mainly by combustion of fossil fuels since the industrial revolution.

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