期刊
CLIMATE OF THE PAST
卷 10, 期 3, 页码 1017-1039出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/cp-10-1017-2014
关键词
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资金
- International Continental Scientific Drilling Program (ICDP)
- US National Science Foundation (NSF)
- German Federal Ministry of Education and Research (BMBF)
- Alfred Wegener Institute (AWI)
- GeoForschungsZentrum Potsdam (GFZ)
- Russian Academy of Sciences Far East Branch (RAS FEB)
- Russian Foundation for Basic Research (RFBR)
- Austrian Federal Ministry of Science and Research (BMWF)
- BMBF [03G0642]
- German Research Foundation (DFG) [ME 1169/24]
- Heisenberg program of the DFG [TA 540/5]
- Directorate For Geosciences
- Division Of Earth Sciences [1204087] Funding Source: National Science Foundation
The 318m thick lacustrine sediment record from Lake El'gygytgyn, northeastern Russian Arctic cored by the international El'gygytgyn Drilling Project provides unique opportunities for the time-continuous reconstruction of the regional paleoenvironmental history for the past 3.6 Myr. Pollen studies of the lower 216 m of the lacustrine sediments demonstrate their value as an excellent archive of vegetation and climate changes during the Late Pliocene and Early Pleistocene. About 3.5-3.35 Myr BP, the vegetation at Lake El'gygytgyn, now an area of tundra was dominated by spruce-larch-fir-hemlock forests. After ca. 3.35 Myr BP dark coniferous taxa gradually disappeared. A very pronounced environmental change took place ca. 3.31-3.28 Myr BP, corresponding to the Marine Isotope Stage (MIS) M2, when treeless tundra-and steppe-like habitats became dominant in the regional vegetation. Climate conditions were similar to those of Late Pleistocene cold intervals. Numerous coprophilous fungi spores identified in the pollen samples suggest the presence of grazing animals around the lake. Following the MIS M2 event, larch-pine forests with some spruce mostly dominated the area until ca. 2.6 Myr BP, interrupted by colder and drier intervals ca. 3.043-3.025, 2.935-2.912, and 2.719-2.698 Myr BP. At the beginning of the Pleistocene, ca. 2.6 Myr BP, noticeable climatic deterioration occurred. Forested habitats changed to predominantly treeless and shrubby environments, which reflect a relatively cold and dry climate. Peaks in observed green algae colonies (Botryococcus) around 2.53, 2.45, 2.32-2.305, 2.20 and 2.16-2.15 Myr BP suggest a spread of shallow water environments. A few intervals (i.e., 2.55-2.53, ca. 2.37, and 2.35-2.32 Myr BP) with a higher presence of coniferous taxa (mostly pine and larch) document some relatively short-term climate ameliorations during Early Pleistocene glacial periods.
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