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A 60 000-year loess-paleosol record of millennial-scale summer monsoon instability from Lanzhou, China

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Chinese Science Bulletin

Abstract

The 28-m high-resolution Shajinping loess section in Lanzhou on the Chinese western Loess Plateau records a detailed history of millennial Asian summer monsoon change since the earlier last glaciation. Summer monsoon proxies of soil magnetic susceptibility, carbonate content and soil color show that Asian summer monsoon experienced a series of rapid episodic pulse enhancements spanning only ca. 1–2 ka and have sub-Milankovitch cycles of progressive weakening in low frequency domain since ca. 60 kaBP. Soil formation responds to these by deepening colors, accumulating organic matter, increasing biological channels and leaching certain carbonates. The pedogenic degree generally increases with the degree of enhancement of summer monsoon. These may reflect the impact of the last glacial fast climatic change in the North Atlantic region on Asian summer monsoon.

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Authors and Affiliations

  1. Department of Geography, Lanzhou University, 730000, Lanzhou, China

    Xiaomin Fang, Baotian Pan, Donghong Guan & Jijun Li

  2. Graduate School of Environmental Earth Science, Hokkaido University, 060, Sapporo, Japan

    Yugo Ono & Keiichi Oi

  3. Department of Geography, Tokyo Metropolitan University, 192-03, Hachioji, Japan

    Hitoshi Fukusawa

Authors
  1. Xiaomin Fang
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  2. Baotian Pan
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  3. Donghong Guan
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  4. Jijun Li
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  5. Yugo Ono
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  6. Hitoshi Fukusawa
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  7. Keiichi Oi
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Fang, X., Pan, B., Guan, D. et al. A 60 000-year loess-paleosol record of millennial-scale summer monsoon instability from Lanzhou, China. Chin.Sci.Bull. 44, 2264–2267 (1999). https://doi.org/10.1007/BF02885935

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  • DOI: https://doi.org/10.1007/BF02885935

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