CAS OpenIR  > 中科院上海应用物理研究所2004-2010年
Disentangling geomagnetic and precipitation signals in an 80-Kyr Chinese loess record of Be-10
Zhou, WJ; Priller, A; Beck, JW; Wu, ZK; Chen, MB(陈茂伯); An, ZS; Kutschera, W; Feng, X; Yu, HG; Lin, L; Zhou, WJ (reprint author), Xian AMS Ctr, Xian 710075, Peoples R China
2007
Source PublicationRADIOCARBON
ISSN0033-8222
Volume49Issue:1Pages:139
AbstractThe cosmogenic radionuclide Be-10 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, Be-10 atmospheric fallout rate also varies locally depending on rainfall rate. The accumulation rate of I Be in sediments is further complicated by overprinting of the geomagnetic and precipitation signals by Be-10 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 Be-10 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 O-18-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 insulation forcing.
Subject AreaChemistry
Indexed BySCI
Language英语
Funding Project应物所项目组
WOS IDWOS:000246375900011
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/8273
Collection中科院上海应用物理研究所2004-2010年
Corresponding AuthorZhou, WJ (reprint author), Xian AMS Ctr, Xian 710075, Peoples R China
Recommended Citation
GB/T 7714
Zhou, WJ,Priller, A,Beck, JW,et al. Disentangling geomagnetic and precipitation signals in an 80-Kyr Chinese loess record of Be-10[J]. RADIOCARBON,2007,49(1):139.
APA Zhou, WJ.,Priller, A.,Beck, JW.,Wu, ZK.,Chen, MB.,...&Zhou, WJ .(2007).Disentangling geomagnetic and precipitation signals in an 80-Kyr Chinese loess record of Be-10.RADIOCARBON,49(1),139.
MLA Zhou, WJ,et al."Disentangling geomagnetic and precipitation signals in an 80-Kyr Chinese loess record of Be-10".RADIOCARBON 49.1(2007):139.
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