Orbit-related long-term climate cycles revealed in a 12-Myr continental record from Lake Baikal

Kenji Kashiwaya (), Shinya Ochiai, Hideo Sakai and Takayoshi Kawai
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Kenji Kashiwaya: Kanazawa University
Shinya Ochiai: Kanazawa University
Hideo Sakai: Toyama University
Takayoshi Kawai: National Institute for Environmental Studies

Nature, 2001, vol. 410, issue 6824, 71-74

Abstract: Abstract Quaternary records of climate change from terrestrial sources, such as lake sediments1,2 and aeolian sediments3,4, in general agree well with marine records5,6. But continuous records that cover more than the past one million years were essentially unavailable until recently, when the high-sedimentation-rate site of Lake Baikal was exploited1,2,7,8. Because of its location in the middle latitudes, Lake Baikal is highly sensitive to insolation changes9 and the entire lake remained uncovered by ice sheets throughout the Pleistocene epoch, making it a valuable archive for past climate. Here we examine long sediment cores from Lake Baikal that cover the past 12 million years. Our record reveals a gradual cooling of the Asian continental interior, with some fluctuations. Spectral analyses reveal periods of about 400 kyr, 600 kyr and 1,000 kyr, which may correspond to Milankovitch periods (reflecting orbital cycles). Our results indicate that changes in insolation were closely related to long-term environmental variations in the deep continental interior, over the past 12 million years.

Date: 2001
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DOI: 10.1038/35065057

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