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Measurement of 10Be Concentration of Modern Falling Dust in Northern China

Published online by Cambridge University Press:  18 July 2016

Feng Xian ,
Weijian Zhou ,
Xianghui Kong ,
Jun Jiang ,
Zhenkun Wu ,
Ning Chen  and
Guoqing Zhao
Feng Xian*
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, No. 99 Yanxiang Road, Yanta District, Xi'an 710052, China
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, No. 99 Yanxiang Road, Yanta District, Xi'an 710052, China School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, No. 26 Xianning West Road, Beilin District, Xi'an 710049, China
Xianghui Kong
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, No. 99 Yanxiang Road, Yanta District, Xi'an 710052, China
Jun Jiang
Affiliation:
Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, No. 26 Xinong Road, Yang Ling 712100, China
Zhenkun Wu
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, No. 99 Yanxiang Road, Yanta District, Xi'an 710052, China
Ning Chen
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, No. 99 Yanxiang Road, Yanta District, Xi'an 710052, China
Guoqing Zhao
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, No. 99 Yanxiang Road, Yanta District, Xi'an 710052, China
*
Corresponding author. Email: [email protected].
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Abstract

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Paleoenvironmental and paleogeomagnetic tracing studies from Chinese loess 10Be have progressed in recent years (Zhou et al. 2007a,b, 2010). In this approach, 10Be flux determined from sediment concentration and accumulation rate may be used to recover information about paleomonsoon rainfall rates as well as past variations in the geomagnetic field strength. However, these methods require that a correction be made for residual undecayed 10Be in remobilized dust. To better understand the feature of the 10Be signals related to the remobilized dust, we report the first observational study on 10Be concentration of modern falling dust using the 3MV multi-element accelerator mass spectrometer (AMS) in the Xi'an AMS Center. Ten samples collected at Ansai observation station (109°19′E, 36°51′N) in northern China from May 2008 to June 2009 are measured along with 3 chemical blanks. The results clearly show that the 10Be content of modern falling dust is relatively uniform, with a mean value of 1.21 x 108 atoms/g, a measurement similar to that of Chinese loess (Zhou et al. 2007a) and to the value found in the study by Shen et al. (2009) on dust 10Be falling near Dingbian, China (1.25 ± 0.06 x 108 atoms/g). Despite the fact that modern dust flux is much higher in spring relative to summer in northern China, 10Be concentration in falling dust remains fairly constant. In addition, we find that dust 10Be concentration is roughly independent of the local precipitation changes. This feature might be considered as an analogue to improve our understanding on the fundamental information of the source component contained in loess 10Be records and its spatial/temporal distribution features.

Type
Articles
Information
Radiocarbon , Volume 54 , Issue 1 , 2012 , pp. 37 - 43
Copyright
Copyright © 2012 by the Arizona Board of Regents on behalf of the University of Arizona 

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