Measurements of atmospheric Δ14CO2 along the R/V Xuelong cruise track from Zhongshan Station (Antarctica) to Shanghai

Xiangdong Zheng; Ping Ding; Zhengbin Han; Chende Shen; Kexin Liu; Jie Tang; Linggen Bian

doi:10.1080/16000889.2020.1807245

Measurements of atmospheric Δ14CO2 along the R/V Xuelong cruise track from Zhongshan Station (Antarctica) to Shanghai

Tellus B: Chemical and Physical Meteorology

Volume 72 (2020): Issue 1

By: Xiangdong Zheng, Ping Ding, Zhengbin Han, Chende Shen, Kexin Liu, Jie Tang and Linggen Bian

Open Access

|Jan 2020

Abstract

During January–March 2011, 29 atmospheric Δ¹⁴CO₂ samples were measured along the R/V Xuelong cruise track from Zhongshan Station (69.37°S, 76.38°E; Antarctica) to Shanghai. The extent of fossil fuel contamination in the samples was evaluated by comparison with contemporary hemispheric-scale averages of Δ¹⁴CO₂, together with transport analysis and consideration of the δ¹³CO₂ levels in the samples. Generally, the Δ¹⁴CO₂ levels along the route south to 40.67°S were lower than the hemispheric-scale average. Circumpolar deep water (CDW) upwelling, stratosphere–troposphere transport (STT), and regional transport associated with the Fukushima nuclear power plant (NPP) accident in Japan on 12 March 2011 were found to have influenced Δ¹⁴CO₂ levels at the sampling sites. In comparison with the atmospheric Δ¹⁴CO₂ level (45.7 ± 3.5‰ (1σ)) measured in the coastal region of East Antarctica, CDW upwelling caused reduction of ∼10‰ in Δ¹⁴CO₂ in two cross sections: 62.0°–64.0°S along 74.0°E and 51.7°–54.0°S along 80.5°–84.0°E. Conversely, STT-enhanced Δ¹⁴CO₂ was ∼7‰ (∼3‰) at Zhongshan (around 45.0°S). The linkage was supported by a certain Model-3/CMAQ simulation that indicated dispersion of radionuclides from the Fukushima NPP accident over the East Asian region, which explained the individual high Δ¹⁴CO₂ (52‰) level on 29 March 2011 in Shanghai.

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DOI: https://doi.org/10.1080/16000889.2020.1807245 | Journal eISSN: 1600-0889

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Language: English

Page range: 1807245 - 1807245

Published on: Jan 1, 2020

Published by: Stockholm University Press

In partnership with: Paradigm Publishing Services

Keywords:

atmospheric Δ,

¹⁴CO₂,

Xuelong cruise,

CDW upwelling dilution,

STT,

Fukushima NPP accident

© 2020 Xiangdong Zheng, Ping Ding, Zhengbin Han, Chende Shen, Kexin Liu, Jie Tang, Linggen Bian, published by Stockholm University Press
This work is licensed under the Creative Commons Attribution 4.0 License.

Volume 72 (2020): Issue 1