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Atmospheric deposition of 7Be, 210Pb and 210Po during typhoons and thunderstorm in Shanghai, China and global data synthesis

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Abstract

Atmospherically-delivered 7Be, 210Po and 210Pb in bulk precipitation and air samples collected around the globe have provided valuable quantification on the rates of removal, as well as proportional mixing of attendant air masses; however, such studies during thunderstorm and typhoon events are limited. We report the first continuous time-series rainwater sampling and analysis of 7Be, 210Pb and 210Po from two typhoons and one thunderstorm during 2015 summer in Shanghai. The depositional fluxes within individual rain events of typhoons and thunderstorms varied by a factor of 10 for 7Be, 5.7 for 210Pb, 7.4 for 210Po, and 7.0 for 7Be/210Pb activity ratios (AR). Such large observed variations in the depositional fluxes of 7Be, 210Pb, 210Po and 7Be/210Pb activity ratios were attributed to air masses injected from surrounding high pressure system adjoining the typhoon to low pressure system within the typhoon. Based on 7Be/210Pb activity ratios, we estimated the variations in the fraction of maritime and continental air masses into the typhoon. Observed constancy in the 210Po/210Pb AR indicates that the residence times of air masses contributing to the typhoon during heavy rain are similar. From a synthesis of global fallout of 7Be and 210Pb during pulse events (precipitation≥50 mm from single rainout event), we quantify the importance of pulse events in the atmospheric fallout of these radionuclides.

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Acknowledgements

The sample collection and analysis reported in this paper were conducted from the SKLEC/ECNU. Data synthesis and writing of this manuscript was conducted during research study of Juan Du at Wayne State University. This work was supported by the China National Key Research and Development Program (Grant No. 2016YFA0600904), the Outstanding Doctoral Dissertation Cultivation Plan of action by the ECNU (Grant No. PY2015027) and the ECNU for Overseas Scholars and the China Scholarship Council (Grant No. 201606140124). Mark Baskaran acknowledges the travel support to SKLEC 111 Project (Grant No. B08022).

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  1. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200241, China

    Juan Du & Jinzhou Du

  2. Department of Geology, Wayne State University, Detroit, 48202, USA

    Mark Baskaran

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  1. Juan Du
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  2. Mark Baskaran
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Correspondence to Jinzhou Du.

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Du, J., Baskaran, M. & Du, J. Atmospheric deposition of 7Be, 210Pb and 210Po during typhoons and thunderstorm in Shanghai, China and global data synthesis. Sci. China Earth Sci. 63, 602–614 (2020). https://doi.org/10.1007/s11430-019-9481-9

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  • DOI: https://doi.org/10.1007/s11430-019-9481-9

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