Stable Mercury Isotopes Revealing Photochemical Processes in the Marine Boundary Layer

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Yue Qiu
  • Pengxue Gai
  • Fange Yue
  • Yuanyuan Zhang
  • Pengzhen He
  • And 5 others
  • Hui Kang
  • Xiawei Yu
  • Paul K. S. Lam
  • Jiubin Chen
  • Zhouqing Xie

Detail(s)

Original languageEnglish
Article numbere2021JD034630
Journal / PublicationJournal of Geophysical Research: Atmospheres
Volume126
Issue number16
Online published6 Aug 2021
Publication statusPublished - 27 Aug 2021

Abstract

The marine boundary layer (MBL) is an important transportation and reaction zone of atmospheric mercury on Earth. However, the transformation mechanisms of Hg in the MBL remain unclear. In this study, total suspended particle samples were collected in the MBL during two cruises, and the levels of particulate bound mercury (PBM) and mercury isotopes were analyzed. The results showed that (a) continental anthropogenic emissions have limited contribution to PBM in the MBL; (b) PBM likely experienced the oxidation of Hg0 by Br radicals and subsequent adsorption of Hg2+ on to particulate surfaces, as inferred from the significant negative δ202Hg; (c) the Δ199Hg/Δ201Hg ratio of ∼1.0 suggests that PBM underwent photoreduction, which was influenced by organic compounds, and the contribution of photoreduction to the extent of odd-number mass-independent fractionation in PBM in the MBL was more significant than that of oxidation triggered by Br atoms. This study provides insights into the photochemical processes influencing mercury in the MBL.

Research Area(s)

  • marine boundary layer, mercury isotope, oxidation, particulate bound mercury, photoreduction

Citation Format(s)

Stable Mercury Isotopes Revealing Photochemical Processes in the Marine Boundary Layer. / Qiu, Yue; Gai, Pengxue; Yue, Fange; Zhang, Yuanyuan; He, Pengzhen; Kang, Hui; Yu, Xiawei; Lam, Paul K. S.; Chen, Jiubin; Xie, Zhouqing.

In: Journal of Geophysical Research: Atmospheres, Vol. 126, No. 16, e2021JD034630, 27.08.2021.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review