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Chinese Science Bulletin

, Volume 44, Issue 24, pp 2264–2267 | Cite as

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

  • Xiaomin Fang
  • Baotian Pan
  • Donghong Guan
  • Jijun Li
  • Yugo Ono
  • Hitoshi Fukusawa
  • Keiichi Oi
Notes

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.

Keywords

last glaciation summer monsoon instability 

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References

  1. 1.
    Dansgaard, W., Johnsen, S. J., Clausen, H. B.et al., Evidence for gencrnl instability of past climate from a 250 kyr icecore record,Nature, 1993, 364: 218.CrossRefGoogle Scholar
  2. 2.
    Bond, G., Broecker, W., Johnsen, S.et al., Correlations between climate records from North Atlantic sediments and Greenland ice,Nature, 1993, 365: 143.CrossRefGoogle Scholar
  3. 3.
    Heinrich, H., Origin nnd consequences of cyclic ice rafting in the Northeast Atlantic Ocean during the past 130 000 years,Quat. Res., 1988, 29: 142.CrossRefGoogle Scholar
  4. 4.
    Porter, S. C., An Zhisheng, Correlation between climate events in the North Atlantic and China during the last glaciation,Nature, 1995, 375: 305.CrossRefGoogle Scholar
  5. 5.
    Li, J.-J., Zhu, J.-J., Kuang, J.-C.et al., Comparison of Lanzhou loess section of last glacial epoch with Antarctic Vostok ice core,Sci. in China, Ser. B. 1990(10): 1086.Google Scholar
  6. 6.
    Tsukamoto, S., Infrared stimulated luminescence (IRSL) dating of Chinese loess deposits,Abst. An. Conf. Jap. Geogr. Soc., Tokyo: Tokyo Metropolitan University, 1997.Google Scholar
  7. 7.
    Martinson, D. G., Pisias, N. G., Hays, J. D.et al., Age dating and the orbital theory of the ice ages: development of a high-resolution 0 to 300 000-year chronostratigraphy,Quat. Res., 1987, 27: 1.CrossRefGoogle Scholar
  8. 8.
    Linsley, B. K., Oxygenisotope record of sea level and climate variations in the Sulu Sea over the past 150 000 years,Nature, 1996, 380: 234.CrossRefGoogle Scholar

Copyright information

© Science in China Press 1999

Authors and Affiliations

  • Xiaomin Fang
    • 1
  • Baotian Pan
    • 1
  • Donghong Guan
    • 1
  • Jijun Li
    • 1
  • Yugo Ono
    • 2
  • Hitoshi Fukusawa
    • 3
  • Keiichi Oi
    • 2
  1. 1.Department of GeographyLanzhou UniversityLanzhouChina
  2. 2.Graduate School of Environmental Earth ScienceHokkaido UniversitySapporoJapan
  3. 3.Department of GeographyTokyo Metropolitan UniversityHachiojiJapan

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