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

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    Author
    Zhou, Weijian
    Priller, Alfred
    Beck, J. Warren
    Zhengkun, Wu
    Maobai, Chen
    Zhisheng, An
    Kutschera, Walter
    Feng, Xian
    Huagui, Yu
    Lin, Liu
    Issue Date
    2007-01-01
    
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    Show full item record
    Citation
    Zhou, W., Priller, A., Beck, J. W., Zhengkun, W., Maobai, C., Zhisheng, A., ... & Lin, L. (2007). Disentangling geomagnetic and precipitation signals in an 80-kyr Chinese loess record of 10Be. Radiocarbon, 49(1), 137-158.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    URI
    http://hdl.handle.net/10150/653589
    DOI
    10.1017/S0033822200041977
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    The cosmogenic radionuclide 10Be is produced by cosmic-ray spallation in Earths 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 delta-18O-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
    Article
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0033822200041977
    Scopus Count
    Collections
    Radiocarbon, Volume 49, Number 1 (2007)

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