Preprints
https://doi.org/10.5194/acp-2022-282
https://doi.org/10.5194/acp-2022-282
 
18 May 2022
18 May 2022
Status: this preprint is currently under review for the journal ACP.

Detection of Stratospheric Air Intrusion Events From Ground-based High-resolution 10Be / 7Be by Accelerator Mass Spectrometry

Xu-Ke Liu1,2,3,5,, Yun-Chong Fu1,2,4,, Li Zhang1,2, George S. Burr1, Yan-Ting Bi5, and Guo-Qing Zhao1,2 Xu-Ke Liu et al.
  • 1State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences (IEECAS), Xi'an 710061, China
  • 2Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Xi'an AMS Center of IEECAS, Xi'an 710061, China
  • 3University of Chinese Academy of Sciences, Beijing 100049, China
  • 4Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an 710049, China
  • 5Xi'an Institute for Innovative Earth Environment Research, Xi'an, 710061, China
  • The authors contribution equally to this work and should be considered co-first authors.

Abstract. Locally rapid stratospheric air intrusions facilitate the transport of stratospheric material to the troposphere. Long-term continuous monitoring of such events by traditional techniques, such as sounding technology, is challenging. Beryllium-7 (7Be) and beryllium-10 (10Be) offer an alternative. These isotopes are formed by cosmic rays and are mainly produced in the lower stratosphere and upper troposphere. Due to their similar geochemical properties and substantial difference in half-lives favor relatively high 10Be / 7Be ratios in the stratosphere, as compared to the troposphere. Monitoring surface 10Be / 7Be ratios affords a potential means to identify stratospheric air intrusions. However, high temporal resolution 10Be / 7Be observational records must be taken and corrected for dust-borne 10Be to identify stratospheric air intrusions. In this study, we use Accelerator Mass Spectrometry to measure both 7Be and 10Be in rain and aerosol (down to ~ 200 cubic meters air) with an error of ~ 1.5 %. We correct for dust-borne 10Be using soil Al. This method provides precise measurements with daily resolution. We present annual beryllium isotopes (7Be, 10Be, and 10Be / 7Be ratio) record for the Chinese Loess Plateau that includes several regional sites. We show that for the city of Xi'an, the proportion of dust-borne (resuspended) 10Be was ~24 % in 2020/21. Our results confirm that stratospheric air intrusion events in the Loess Plateau are frequent and rapid throughout the year and are strongest in the spring (March–July), when 10Be / 7Be values were observed to increase about a factor of 3. Even in winter, weaker stratospheric air intrusion events can be detected. Calculated Δ(10Be / 7Be) values in winter suggest stratospheric ozone transport can lead to an ~25 % cumulative increase the surface ozone.

Xu-Ke Liu et al.

Status: open (until 29 Jun 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-282', Anonymous Referee #1, 23 May 2022 reply
    • AC1: 'Reply on RC1', Xuke Liu, 28 Jun 2022 reply
  • RC2: 'Comment on acp-2022-282', Anonymous Referee #2, 24 Jun 2022 reply
    • AC2: 'Reply on RC2', Xuke Liu, 28 Jun 2022 reply
  • CC1: 'Comment on acp-2022-282', Yongjing Guan, 27 Jun 2022 reply
    • AC3: 'Reply on CC1', Xuke Liu, 28 Jun 2022 reply

Xu-Ke Liu et al.

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Short summary
Based on the high-precision analysis of the accelerator mass spectrometer, the stratospheric air intrusion process of different intensities throughout the year was recorded for the first time with the daily resolution beryllium-10 / beryllium-7 ratio. The local weak stratospheric intrusion events in the Chinese Loess Plateau were directly detected on the ground, and it was found that these processes has a significant contribution to surface ozone.
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