Holocene paleoclimate changes determined using diatom assemblages from Lake Long,King George Island,Antarctica |
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| Authors: | Kyung Lee Sook-Kyung Yoon Ho Il Yoon |
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| Institution: | (1) Department of Life Science, The Catholic University of Korea, Bucheon-si, 420-743, South Korea;(2) Polar Environment Research Division, Korea Polar Research Institute (KOPRI), Incheon, 406-840, South Korea |
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| Abstract: | Formation of Lake Long, King George Island, Antarctica started about 4,000 years B.P., after which the diatom community changed
in response to environmental shifts driven by climatic oscillations (warm/wet and cool/dry). Successive sequences of diatoms
in a 7.5-m drill core were divided into 11 assemblage zones by cluster analysis. The most obvious change was an alternation
of major dominants, Achnanthes minutissima, Fragilaria alpestris and Fragilaria pinnata v. antarctica according to the climatic oscillations in the late Holocene. Variations in diatom assemblages clearly reflect two warm periods,
a single cool period, and three transition periods. The recent warm period (zones 2 and 1) has persisted for approximately
450 years, perhaps sufficiently long to suggest the imminent onset of a new transition period. A recent high TOC (total organic
carbon) value in the core reflects a warm period in Antarctica during the late Holocene. |
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| Keywords: | Antarctica Climatic change Diatoms Holocene King George Island Lake Long |
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