末次盛冰期冰量及海平面变化

Ice volume and sea level of the Last Glacial Maximum

末次冰期冰盛期(LGM)是十分关键的气候时期,这是距我们最近的极寒冷时期,大量冰盖覆盖在欧洲高纬度地区和北美,研究LGM对认识气候变化有重要意义。本文从海平面变化的影响因素及沉积记录出发,并分析末次盛冰期冰量对海平面变化的均衡作用,讨论了LGM的年代学约束,认为LGM为26.5~19.0 ka BP的一个时期,冰川均衡调整对海平面具有重要影响,末次盛冰期形成120m的低海面,与太阳辐射减少,SST海水表面温度下降和CO2的减少有密切关系。

The Last Glacial Maximum( LGM),the coldest period,was the most recent interval in Earth history when global ice sheets cover in high latitude of North America and most of Europe. Studying on LGM is important to understanding of climate change. Here we sketch the records and impact factors of sea level change,and analysis ice volume equilibrium effect on sea level change during LGM. Then constrain the timing of the Last Glacial Maximum( LGM) in terms of ice volume. Suggesting Glacial IsostaticAdjustment( GIA) has significance effect in sea level change. LGM is a period in 26. 5 ~ 19. 0 ka BP and a net decrease in global sea level low to 120m due to the climate forcing from decreases in northern summer insolation,sea surface temperatures of tropical Pacific and atmospheric CO2.