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Lake-level changes during the past 100,000 years at Lake Baikal, southern Siberia |
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| Authors: | Atsushi Urabe Masaaki Tateishi Hirokazu Matsuoka Alexsander Dmytriev |
| Institution: | a Research Institute for Hazards in Snowy Areas, Niigata University, Niigata 950-2181, Japan b Faculty of Science, Niigata University, Niigata 950-2181, Japan c Center for Marine Environmental Studies, Ehime University, Matsuyama 790-8577, Japan d Kowa Consulting Office, Tokyo 202-0022, Japan e Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577, Japan f Faculty of Geology, Geological Data Processing and Geological Ecology, State Technical University, Irkutsk 664074, Russia g Limnological Institute, Siberian Branch of Russian Academy of Science, Irkutsk 664033, Russia |
| Abstract: | Lake-level changes inferred from seismic surveying and core sampling of the floor of Lake Baikal near the Selenga River delta can be used to constrain regional climatic history and appear to be correlated to global climate changes represented by marine oxygen isotope stages (MIS). The reflection pattern and correlation to the isotope stages indicate that the topset and progradational foreset sediments of the deltas formed during periods of stable lake levels and warm climatic conditions. During warm stages, the lake level was high, and during cold stages it was low. The drop in the lake level due to cooling from MIS 5 through MIS 4 is estimated to be 33-38 m; from MIS 3 through MIS 2, it fell an additional 11-15 m. Because the lake level is chiefly controlled by evaporation and river input, we infer that more water was supplied to Lake Baikal during warm stages. |
| Keywords: | Seismic survey Selenga Delta Marine oxygen isotope stage Lake-level change Lake Baikal |
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