Long-term climato-limnological cycles found in a 3.5-million-year continental record |
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| Authors: | Kenji Kashiwaya Hideo Sakai Masayuki Ryugo Masae Horii Takayoshi Kawai |
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| Affiliation: | (1) Department of Earth Sciences, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan;(2) Department of Earth Sciences, Toyama University, Toyama, 930-8555, Japan;(3) National Institute for Environmental Studies, Tsukuba, Ibaragi, 350-0053, Japan |
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| Abstract: | Analysis of physical properties in long sediment cores (BDP96) from Academician Ridge in Lake Baikal indicates that major climato-limnological changes during the past 3.5 Myr occurred at about 2.5–2.8, 1.7–1.9, and 0.9–1.2 Ma, which were close to times of major geomagnetic polarity reversals (Matuyama/Gauss, Olduvai, Jaramillo + Matuyama/Brunhes). The principal climato-limnological oscillation has a long-term period of nearly 1,000 kyr, which corresponds to the periodicity of fluctuation in solar insolation. It also seems to be related to geomagnetic field intensity. Other long-term period of 400 kyr corresponds to Milankovitch parameters of eccentricity. These results suggest that changes in solar insolation were closely related to long-term environmental variations in the deep continental interior. |
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| Keywords: | Lake Baikal physical properties insolation magnetic intensity climatic signals |
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