ADVANCES IN POLAR SCIENCE ›› 2012, Vol. 24 ›› Issue (3): 205-214.DOI: 10.3724/SP.J.1084.2012.00205

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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

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