极地研究 ›› 2012, Vol. 24 ›› Issue (3): 205-214.DOI: 10.3724/SP.J.1084.2012.00205

• 研究论文 •    下一篇

东南极拉斯曼丘陵湖泊沉积生物标志物记录及其环境气候意义

刘毅1 罗宇涵1 孙松2 何毓新3 柳中晖3 孙立广1   

  1. 1中国科学技术大学地球和空间科学学院极地环境研究室,安徽 合肥 230026;
    2 中国科学院海洋研究所海洋生态与环境重点实验室,山东 青岛,266071;
    3 香港大学地球科学系,香港5. 香港大学地球科学系
  • 收稿日期:2012-02-23 修回日期:2012-03-16 出版日期:2012-09-30 发布日期:2012-09-30
  • 通讯作者: 孙立广
  • 基金资助:

    极地专项:极地生态地质学与环境综合考察——中山站DOME-A断面生态指示计;国家重点基础研究发展计划:中国西沙群岛和北极黄河站持久有机污染物(POPS)调查 持久性有机污染物POPS的环境安全、演变趋势与控制原理;国家自然科学基金:全新世南极南海典型岛屿对全球变化的生态响应与对比

BIOMARKERS RECORDS FROM LACUSTRINE SEDIMENT, LASEMANN HILLS, EAST ANTARCTICA

Liu Yi1, Luo Yuhan1, Sun Song2, He Yuxin3, Liu Zhonghui3, Sun Liguang1   

  1.  1Institute of Polar Environment, Department of Earth and Space Science, University of Science and Technology of China, Hefei 230026, China;

    2 Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
    3 Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
  • Received:2012-02-23 Revised:2012-03-16 Online:2012-09-30 Published:2012-09-30

摘要: 东南极拉斯曼丘陵地区莫愁湖(69°22.3’ S,76°22.0’ E)沉积柱中的有机生物标志物记录了全新世中晚期该地区气候演变过程。不饱和长链烯酮在沉积柱111-76 cm (6450-5100 cal. yr. BP)和36-30 cm(3700-3500 cal. yr. BP)深度有检出,76 cm深度以上基本消失,表明该地区在5100 cal. yr. BP前后气候开始由冷转暖,冰川消融,陆壳抬升,相对海平面下降,同时大量的冰融水使湖泊逐渐淡化。沉积柱底部长链烯酮的检出阶段与东南极相对海平面较高时期相一致,而沉积柱36-30 cm(3700-3500 cal. yr. BP)深度不饱和长链烯酮的痕量检出则揭示了一个短暂的气候干冷,湖泊盐度升高的时期。沉积物中正构烷烃反映的当地气候变化所控制的湖生植物群落演变过程与上述过程基本一致。

关键词: 东南极, 拉斯曼丘陵, 长链烯酮, 正构烷烃, 相对海平面

Abstract: Biomarker records from Mochou lake sediments, Larsemann Hills (69°22.3′S, 76°22.0′E), East Antarctica, reveals mid-late Holocene climate history in the region. . As biomarkers for a limited number of certain haptophytes, the long chain alkenones (LCAs) were found from bottom to 76 cm of the sediment core (6500-5100 cal. yr. BP), a period with high relative sea level. Trace amounts of LCAs were also found at 36-30 cm (3700-3500 cal. yr. BP), which reflected change of lake salinity caused by cold climate with fewer ice melt water and higher evaporation. The absence of LCAs above 76cm (about 5100 cal. yr. BP) was consistent with the climate switching from cold to warm and gradually dropping of relative sea level, resulting in more glacial melting water and less intrusion of sea water. The evolution of n-alkanes (C19-C33) reflected the same history of hygrophyte population.

Key words: East Antarctica, Larsemann Hills, long chain alkenones, n-alkanes, relative sea-level