TY - JOUR N2 - A sediment core (LS-1) collected from Long Lake in King George Island, South Shetland Islands (West Antarctica) was analyzed for a variety of textural, geochemical, isotopic and paleontological properties together with 14C age dates. These data combined with published records of other studies provide a detailed history of local/regional postglacial paleoproductivity variation with respect to terrestrial paleoclimate change. The lithologic contrast of a lower diamicton and an upper fine-grained sediment demonstrates glacial recession and subsequent lake formation. The upper fine-grained deposit, intercalated by mid-Holocene tephra-fallout followed by a tephra gravity flow, was formed in a lacustrine environment. Low total organic carbon (TOC) and biogenic silica (Sibio) contents with high C/N ratios characterize the diamicton, whereas an increase of TOC and Sibio contents characterize the postglacial lacustrine fine-grained sediments, which are dated at c. 4000 yrBP. More notable are the distinct TOC maxima, which may imply enhanced primary productivity during warm periods. Changes in Sibio content and δ13C values, which support the increasing paleoproductivity, are in sympathy with these organic matter variations. The uniform and low TOC contents that are decoupled by Sibio contents are attributed to the tephra gravity flows during the evolution of the lake rather than a reduced paleoproductivity. A very recent TOC maximum is also characterized by high Sibio content and δ13C values, clearly indicating increased paleoproductivity consequent upon gradual warming across King George Island . Comparable with changes in sediment geochemistry, the occurrence and abundance of several diatom species corroborate the paleoproductivity variations together with the lithologic development. However, the paleoclimatic signature in local terrestrial lake environment during the postglacial period (for example the Long Lake) seems to be less distinct, as compared to the marine environment. L1 - http://journals.pan.pl/Content/110615/PDF-MASTER/ppr27-189.pdf L2 - http://journals.pan.pl/Content/110615 PY - 2006 IS - No 3 EP - 206 KW - Antarctica KW - lake sediment KW - paleoclimate KW - diatoms KW - organic carbon KW - carbon isotopes A1 - Yoon, Ho-Il A1 - Khim, Boo-Keun A1 - Lee, Kyung A1 - Park, Yu-Hyeon A1 - Yoo, Kyu-Cheul PB - Polish Academy of Sciences PB - Committee on Polar Research VL - vol. 27 DA - 2006 T1 - Reconstruction of postglacial paleoproductivity in Long Lake, King George Island, West Antarctica SP - 189 UR - http://journals.pan.pl/dlibra/publication/edition/110615 T2 - Polish Polar Research ER -