A LATE HOLOCENE LAKE SEDIMENT SEQUENCE FROM LIVINGSTON-ISLAND, SOUTH-SHETLAND-ISLANDS, WITH PALEOCLIMATIC IMPLICATIONS

被引：120
作者：
BJORCK, S
HAKANSSON, H
ZALE, R
KARLEN, W
JONSSON, BL
机构：
[1] Department of Quaternary Geology, Lund University, Tornav, 13, S-223 63, Lund
[2] Department of Geography, University of Umea, S-901 87, Umea
[3] Department of Physical Geography, University of Stockhom, S-106 91, Stockholm
来源：
ANTARCTIC SCIENCE | 1991年 / 3卷 / 01期
关键词：
ANTARCTICA; C-14; CHRONOLOGY; LAKE SEDIMENTS; MICROFOSSIL STRATIGRAPHY; PALEOCLIMATOLOGY; PALEOECOLOGY;
D O I：
10.1017/S095410209100010X
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Analysis of a 1.5 m thick sediment sequence from Midge Lake, Byers Peninsula, Livingston Island, shows that the lake and its catchment have undergone significant changes during the last 4000 years. Radiocarbon dating (AMS), sediment lithology, and microfossil analyses indicate that the lake was deglaciated over 4000 C-14 years ago. Distinct peaks in accumulation rates of sediment, Pediastrum algae, pollen and spores, as well as changes in the diatom assemblage, suggest significant environmental changes between ca 3200 and 2700 y BP. These changes are interpreted as reflecting a milder and more humid, maritime climate. The increased humidity can explain independent observations of glacier growth during this period. The combined data also indicate that between ca 1500 and 500 y BP the area might have experienced more continental conditions with slightly colder and drier climate than today. Since the C-14 dates from the Midge Lake sediments are regarded as reliable and the sediment sequence is rich in tephra layers this sediment sequence will be critical for a forthcoming tephra chronology of the region.
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页码：61 / 72
页数：12
相关论文
共 32 条
  • [1] Barsch D., MAusbacher R., New data on the relief development of the Southern Shetland Islands, Antarctica, Interdisciplinary Science Review, 11, pp. 211-218, (1986)
  • [2] Beger H., Beiträge zur Ökologie und Soziologie der luftlebigen (atmophytischen) Kieselalgen, Berichte der deutschen Botanischen Gesellschaft, 45, pp. 385-407, (1927)
  • [3] Behre K., Schwabe G.H., Auf Surtsey/Island im Sommer 1968 nachgewiesene nicht marine Algen (Uber die naturlich Fruhbesiedlung postvulkanischer Substrate oberhalb des Litorals, Schriften des Naturwissenschaftlichen Vereins in Schleswig-Holstein, pp. 31-100, (1970)
  • [4] Birkenmajer K., Raised marine features and glacial history in the vicinity of Arctowski Station, King George Island (South Shetland Islands, West Antarctica, Bulletin of the Polish Academy of Sciences, 29, pp. 109-117, (1981)
  • [5] Birkenmajer K., Ochyra R., Olsson I.U., Stuchlk L., Mid-Holocene radiocarbon-dated peat at Admiralty Bay, King George Island (South Shetland Islands, West Antarctica), Bulletin of the Polish Academy of Sciences, 33, 7, (1985)
  • [6] Bjorck S., Persson T., Kristersson I., Comparisons of two concentration methods for pollen in minerogenic sediments, Geologiska Föreningens i Stockholm Förhandlingar, 100, pp. 107-111, (1978)
  • [7] Bock W., Diatomeen extrem trockener Standorte, Nova Hedwigia, 5, pp. 199-247, (1963)
  • [8] Bourelley P., Manguin E., Contribution à la flore algale d’eau douce des Iles Kerguelen, Mémoires de I’institut Scientifique de Madagascar, 5, pp. 7-56, (1954)
  • [9] Sheet 2, Northern Graham Land and South Shetland Islands, (1979)
  • [10] Clapperton C.M., Sugden D.E., Geomorphology of the St. Andrews Bay-Royal Bay area, South Georgia, (1980)
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