Preprints
https://doi.org/10.5194/gmd-2021-404
https://doi.org/10.5194/gmd-2021-404

Submitted as: development and technical paper 06 Jan 2022

Submitted as: development and technical paper | 06 Jan 2022

Review status: this preprint is currently under review for the journal GMD.

Modelling the High Mercury Wet deposition in the Southeastern US by WRF-GC

Xiaotian Xu1,a, Xu Feng2,b, Haipeng Lin3, Peng Zhang1, Shaojian Huang1, Zhengcheng Song1, Yiming Peng1, Tzung-May Fu4, and Yanxu Zhang1 Xiaotian Xu et al.
  • 1Department of Atmospheric Sciences, Nanjing University, Nanjing, Jiangsu, China
  • 2Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, China
  • 3John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA
  • 4School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, China
  • aCurrent affiliation: Department of Atmospheric Science, University of Illinois at Urbana-Champaign, Urbana, IL, USA
  • bCurrent affiliation: John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA

Abstract. High mercury wet deposition in southeastern United States has been noticed for many years. Previous studies came up with a theory that it was associated with high-altitude divalent mercury scavenged by convective precipitation. Given the coarse resolution of previous models (e.g. GEOS-Chem), this theory is still not fully tested. Here we employed a newly developed WRF-GEOS-Chem (WRF-GC) model implemented with mercury simulation. We conduct extensive model benchmarking by comparing WRF-GC with different resolutions (from 50 km to 25 km) to GEOS-Chem output (4° × 5°) and data from Mercury Deposition Network (MDN) in July–September 2013. The comparison of mercury wet deposition from two models both present high mercury wet deposition in southeastern United States. We divided simulation results by heights, different types of precipitation and combination of these two variations together and find most of mercury wet deposition concentrates on higher space and caused by convective precipitation. Therefore, we conclude that it is the deep convection caused enhanced mercury wet deposition in the southeastern United States.

Xiaotian Xu et al.

Status: open (until 03 Mar 2022)

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Xiaotian Xu et al.

Xiaotian Xu et al.

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Short summary
High mercury wet deposition in the southeastern US has been a problem for many years. Here we employed a newly developed high-resolution WRF-GC mode with capability of mercury simulation to study this problem. In this research, we conclude that it is the deep convection caused enhanced mercury wet deposition in the southeastern United States.