Atmospheric ¹⁴C/¹²C changes during the last glacial period from Hulu Cave

Hai Cheng^{1

2}, R Lawrence Edwards³, John Southon⁴, Katsumi Matsumoto², Joshua M Feinberg^{2

5}, Ashish Sinha⁶, Weijian Zhou⁷, Hanying Li⁸, Xianglei Li⁸, Yao Xu⁸, Shitao Chen⁹, Ming Tan¹⁰, Quan Wang⁹, Yongjin Wang⁹, Youfeng Ning⁸

Affiliations

¹ Institute of Global Environmental Change, Xi'an Jiaotong University, China. cheng021@xjtu.edu.cn edwar001@umn.edu.
² Department of Earth Sciences, University of Minnesota, Minneapolis, MN, USA.
³ Department of Earth Sciences, University of Minnesota, Minneapolis, MN, USA. cheng021@xjtu.edu.cn edwar001@umn.edu.
⁴ Department of Earth System Science, University of California, Irvine, CA, USA.
⁵ Institute for Rock Magnetism, University of Minnesota, Minneapolis, MN, USA.
⁶ Department of Earth Science, California State University Dominguez Hills, Carson, CA, USA.
⁷ Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China.
⁸ Institute of Global Environmental Change, Xi'an Jiaotong University, China.
⁹ College of Geography Science, Nanjing Normal University, Nanjing, China.
¹⁰ Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China.

PMID: 30545886
DOI: 10.1126/science.aau0747

Atmospheric ¹⁴C/¹²C changes during the last glacial period from Hulu Cave

Hai Cheng et al. Science. 2018.

. 2018 Dec 14;362(6420):1293-1297.

doi: 10.1126/science.aau0747.

Authors

Affiliations

¹ Institute of Global Environmental Change, Xi'an Jiaotong University, China. cheng021@xjtu.edu.cn edwar001@umn.edu.
² Department of Earth Sciences, University of Minnesota, Minneapolis, MN, USA.
³ Department of Earth Sciences, University of Minnesota, Minneapolis, MN, USA. cheng021@xjtu.edu.cn edwar001@umn.edu.
⁴ Department of Earth System Science, University of California, Irvine, CA, USA.
⁵ Institute for Rock Magnetism, University of Minnesota, Minneapolis, MN, USA.
⁶ Department of Earth Science, California State University Dominguez Hills, Carson, CA, USA.
⁷ Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China.
⁸ Institute of Global Environmental Change, Xi'an Jiaotong University, China.
⁹ College of Geography Science, Nanjing Normal University, Nanjing, China.
¹⁰ Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China.

PMID: 30545886
DOI: 10.1126/science.aau0747

Abstract

Paired measurements of ¹⁴C/¹²C and ²³⁰Th ages from two Hulu Cave stalagmites complete a precise record of atmospheric ¹⁴C covering the full range of the ¹⁴C dating method (~54,000 years). Over the last glacial period, atmospheric ¹⁴C/¹²C ranges from values similar to modern values to values 1.70 times higher (42,000 to 39,000 years ago). The latter correspond to ¹⁴C ages 5200 years less than calibrated ages and correlate with the Laschamp geomagnetic excursion followed by Heinrich Stadial 4. Millennial-scale variations are largely attributable to Earth's magnetic field changes and in part to climate-related changes in the oceanic carbon cycle. A progressive shift to lower ¹⁴C/¹²C values between 25,000 and 11,000 years ago is likely related, in part, to progressively increasing ocean ventilation rates.

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Atmospheric ¹⁴C/¹²C changes during the last glacial period from Hulu Cave

Affiliations

Atmospheric ¹⁴C/¹²C changes during the last glacial period from Hulu Cave

Authors

Affiliations

Abstract

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LinkOut - more resources

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