东南极、西南极4000年以来生物活动强度变化与南极冰芯的对比

COMPARISON OF BIOLOGICAL PROXY RECORDED IN ANTARCTIC LAKE SEDIMENTS AND ICE CORE IN THE RECENT 4000 YEARS

利用南极中山站地区的冰退速率和奈拉湖湖相沉积物中的硫浓度分布特征推算了奈拉湖的沉积速度。以硫元素浓度作为湖相沉积物中生物活动强度的指标，对比了西南极长城站地区西湖沉积物和东南极中山站奈拉湖沉积物中生物活动强度的变化趋势，并与Ｄ１０冰芯中反映海洋生物活动强度的指标ＣＨ３ＳＯ－３的浓度变化趋势作对比。结果表明，４０００ａＢ．Ｐ．以来三者的历史变化趋势是明显一致的，１８５０～１１５０ａＢ．Ｐ．是生物活动的最宜期，这是全球环境变化在不同地点、不同类型沉积物中的表现。

The sedimentation rate of Lake Nella near Zhongshan Station,east Antarctica,is deduced according to the ice sheet retreatment rate of this area and the temporal variation of sulfur concentration in the sediment of Lake Nella. The 4000year variation of sulfur,index for biological activity,in sediments of Xihu Lake,west Antarctica and Lake Nella,east Antarctica is compared with that of CH3SO-3,index for marine biological activity,in D10 ice core. The results show that the three curves are very similar in their trend,demonstrating the global change in the recent 4000 years. The most favorable period was between 1850a B.P. and 1150 a B.P..