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Disentangling Geomagnetic and Precipitation Signals in an 80-kyr Chinese Loess Record of 10Be

Published online by Cambridge University Press:  18 July 2016

Weijian Zhou ,
Alfred Priller ,
J Warren Beck ,
Wu Zhengkun ,
Chen Maobai ,
An Zhisheng ,
Walter Kutschera ,
Xian Feng ,
Yu Huagui  and
Liu Lin
Weijian Zhou*
Affiliation:
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, No. 10 Fenghui South Road, Hi-tech Zone, Xi'an 710075, China Xi'an AMS Center, Xi'an 710075 China
Alfred Priller
Affiliation:
VERA (Vienna Environmental Research Accelerator), University of Vienna, Währinger, Str. 17, 1090 Vienna, Austria
J Warren Beck
Affiliation:
NSF-Arizona AMS Facility, Physics Department, Building #81, University of Arizona, Tucson, Arizona 85721, USA.
Wu Zhengkun
Affiliation:
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, No. 10 Fenghui South Road, Hi-tech Zone, Xi'an 710075, China
Chen Maobai
Affiliation:
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, No. 10 Fenghui South Road, Hi-tech Zone, Xi'an 710075, China Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
An Zhisheng
Affiliation:
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, No. 10 Fenghui South Road, Hi-tech Zone, Xi'an 710075, China
Walter Kutschera
Affiliation:
VERA (Vienna Environmental Research Accelerator), University of Vienna, Währinger, Str. 17, 1090 Vienna, Austria
Xian Feng
Affiliation:
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, No. 10 Fenghui South Road, Hi-tech Zone, Xi'an 710075, China
Yu Huagui
Affiliation:
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, No. 10 Fenghui South Road, Hi-tech Zone, Xi'an 710075, China
Liu Lin
Affiliation:
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, No. 10 Fenghui South Road, Hi-tech Zone, Xi'an 710075, China
*
Corresponding author. Email: weijian@loess.llqg.ac.cn.
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Abstract

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The cosmogenic radionuclide 10Be is produced by cosmic-ray spallation in Earth's atmosphere. Its production rate is regulated by the geomagnetic field intensity, so that its accumulation rate in aeolian sediments can, in principle, be used to derive high-resolution records of geomagnetic field changes. However, 10Be atmospheric fallout rate also varies locally depending on rainfall rate. The accumulation rate of 10Be in sediments is further complicated by overprinting of the geomagnetic and precipitation signals by 10Be attached to remobilized dust, which fell from the atmosphere at some time in the past. Here, we demonstrate that these signals can be deconvoluted to derive both geomagnetic field intensity and paleoprecipitation records of Asian Monsoon intensity in an 80,000-yr-long 10Be record from Chinese loess. The strong similarity between our derived paleomagnetic intensity record and the SINT 200 (Guyodo and Valet 1996) and NAPIS 75 (Laj et al. 2002) stacked-marine records suggests that this method might be used to produce multimillion-yr-long records of paleomagnetic intensity from loess. This technique also reveals a new method for extracting quantitative paleoprecipitation records from continental interior regions. Our derived precipitation record is broadly similar to the speleothem δ18O-based records of paleo-Asian Monsoon intensity from Dongge (Yuan et al. 2004) and Hulu (Wang et al. 2001) caves, and suggests that the paleo-Asian Monsoon intensity may be responding to a combination of both Northern and Southern Hemisphere insolation forcing.

Type
Articles
Information
Radiocarbon , Volume 49 , Issue 1 , 2007 , pp. 137 - 158
Copyright
Copyright © 2007 by the Arizona Board of Regents on behalf of the University of Arizona 

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