东南极拉斯曼丘陵中晚全新世湖泊生物量的变化记录

doi:10.3724/SP.J.1084.2012.00159

摘要/Abstract

摘要： 对东南极拉斯曼丘陵莫愁湖ZH沉积柱进行了生态地质学的研究，通过AMS-14C定年构建年龄框架，采用550℃烧失量、粒度和元素地球化学指标等，恢复了中晚全新世该地区较高分辨率的湖泊生物量记录。结果显示，距今6600-6100年、5400-4800年、4650-3750年和3500年-2850年为莫愁湖生物量高值期，气候相对温暖适宜，湖泊生产力旺盛；距今6100-5400年、4800-4650年和3750-3500年为湖泊生物量低值期，气候相对寒冷，湖泊生产力相对较弱。而且在整体较暖的气候环境下，出现了其它无冰区沉积物中鲜有记录的距今4800-4650年、4400年前后和3750-3500年的气候快速变冷事件。根据莫愁湖湖泊生物量恢复的东南极拉斯曼地区高分辨的气候变化特征，与太阳活动强度和东南极大陆冰芯记录相吻合，为东南极中晚全新世多样的气候格局研究提供了新的依据。

关键词: 东南极, 拉斯曼丘陵, 莫愁湖, 中晚全新世, 湖泊生物量, 气候变化

Abstract: The geochemical analysis was performed on a sediment core, named ZH, in Mochou lake in the Larsemann Hills, East Antarctic. The chronology was established based on AMS14C dates. The high resolution records of lake biomass were retrieved from the loss on ignition at 550℃(LOI550℃), grain size and geochemical element indexes. The results showed High Biomass Period at 6600-6100 yr BP, 5400-4800 yr BP, 4650-3750 yr BP and 3500-2850 yr BP in Mochou lake with warm and humid climate and high lake productivity, while Low Biomass Period at 6100-5400 yr BP, 4800-4650 yr BP and 3750-3500 yr BP with cold and arid climate as well as low lake productivity. There were also evidences of the rapid cooling events around 4850-4650 yr BP, 4400 yr BP and 3750-3500 yr BP, which were rarely reported from other ice-free regions of East Antarctic. Overall, the biomass of Mochou lake provide higher resolution climate characters of Larsemann Hills and a new evidence for the climate pattern of Mid-Late Holocene in East Antarctic.

Key words: East Antarctic, Larsemann Hills, Mochou lake, Mid-Late Holocene, lake biomass, climate change

罗宇涵刘毅孙立广. 东南极拉斯曼丘陵中晚全新世湖泊生物量的变化记录[J]. 极地研究, 2012, 24(2): 159-167.

Luo Yuhan，Liu Yi，Sun Liguang. A Mid-Late Holocene Lake Biomass Record in Larsemann Hills, East Antarctic[J]. ADVANCES IN POLAR SCIENCE, 2012, 24(2): 159-167.

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