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地球科学进展  1998, Vol. 13 Issue (4): 356-363    DOI: 10.11867/j.issn.1001-8166.1998.04.0356
干旱气候变化与可持续发展     
晚冰期Younger Drayas环境灾变
黄春长
陕西师范大学旅游与环境学院  西安  710062
THE CATASTROPHIC ENVIRONMENTAL CHANGE IN THE YOUNGER DRYAS EVENT DURING THE LAST DEGLACIATION
Huang Chunchang
College of Tourism and Environmental Sciences,Shanxi Normal University,Xi’an  710062
 全文: PDF(287 KB)  
摘要:

新仙女木事件(Younger Dryas Event)是过去15000年里全球最为严重的环境灾变事件。它使得冰期气候急剧回返,陆地自然环境严重恶化,并且遣成更新世末期的生物界大绝灭。该事件在深海沉积、大陆冰盖和湖泊沉积物剖面都有多种十分显著的记录。对其成因和机制的研究,将会深入揭示太阳辐射—大气—海洋气—冰盖气—陆地气—生物圈相互作用系统中的非线性反馈现象,为探索人类面临的全球变化问题提供借鉴。

关键词: Younger Dryas事件冰期回返环境灾变非线性反馈    
Abstract:

The Younger Dryas Stadial,11 000-10 O0O a B P,is the most remarkable catastrophic environmental change in the circum-north Altantic region since  the Last Deglaciation.It is characterized by the sudden return of glacial climate.and deteroration of environment.Plenty of terrestrial evidence for the abrupt environmental deterioration found in Northwest Europe and also North Ameirca.There are indications of ice-sheets readvance and renewed glacier activities in the mountain regions.Periglacial condiitons returned to many lowland areas and scrub tundra developed.Fossil records show that the YD event caused the extinction of the mammoths-woolly rhino funa.Reconstructed high-resolution time series of the climaitc changes during the last deglcaiation now proves that the Younger Dryas event occurred during the time with highest solar radiation in the North Hemisphere,it was too abruptly to have been directly forced by the orbital dynamics.It is now attributed to the non-linear feedback in the interaciton system of the atmosphere-ocean-ice sheet-land-bioshphere.The flickering switch of the deglaciation climate must have been triggered by the ice sheet behavior,the melting rate,iceberg discharge and ocean-atmosphere heat flux/surface water circulation in and around the North Atlantic. The change in ocean-atomsphere-land carbon budget could also be a forcing factor in this short-lasting climatic change.Thus the study of the Younger Dryas mechanism may be able to provide some clues to the global worming facing us at present.

Key words: Younger Dryas    Rerurn of glacial conditions    Catastrophic    environmental change    Non-linear feedback.
收稿日期: 1997-11-03 出版日期: 1998-08-01
:  P532  
通讯作者: 黄春长   
作者简介: 黄春长,男,1954年1月出生,教授,主要从事环境变迁、全球变化和人地关系演变研究。
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引用本文:

黄春长. 晚冰期Younger Drayas环境灾变[J]. 地球科学进展, 1998, 13(4): 356-363.

Huang Chunchang. THE CATASTROPHIC ENVIRONMENTAL CHANGE IN THE YOUNGER DRYAS EVENT DURING THE LAST DEGLACIATION. Advances in Earth Science, 1998, 13(4): 356-363.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.1998.04.0356        http://www.adearth.ac.cn/CN/Y1998/V13/I4/356

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[1] 黄春长. 西北欧全新世中期的Elm Decline研究新进展[J]. 地球科学进展, 1996, 11(5): 487-492.