Preprints
https://doi.org/10.5194/acp-2022-367
https://doi.org/10.5194/acp-2022-367
 
25 May 2022
25 May 2022
Status: this preprint is currently under review for the journal ACP.

Measurement report: Atmospheric mercury in a coastal city of Southeast China: inter-annual variations and influencing factors

Jiayan Shi1,2,4, Yuping Chen1,2,3, Lingling Xu1,2, Youwei Hong1,2, Mengren Li1,2, Xiaolong Fan1,2, Liqian Yin1,2, Yanting Chen1,2, Chen Yang1,2,3, Gaojie Chen1,2,3, Taotao Liu1,2,3, Xiaoting Ji1,2,3, and Jinsheng Chen1,2 Jiayan Shi et al.
  • 1Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
  • 2Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
  • 3University of Chinese Academy Sciences, Beijing 100049, China
  • 4College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China

Abstract. Long-term monitoring of atmospheric mercury is an important part of the effective evaluation of the Minamata Convention on Mercury. Gaseous elemental mercury (GEM) along with conventional air pollutants and meteorological parameters were simultaneously observed in Xiamen city, Southeast China in January and July over the period 2012–2020. GEM concentrations in January slightly increased from 2012 (3.50 ng m-3) to 2015 (4.47 ng m-3) and then decreased to 2020 (3.93 ng m-3), while GEM in July maintained stable from 2012 to 2017, and decreased significantly in 2020. The temporal variation of GEM was characterized by higher concentrations in winter than in summer and in nighttime than in daytime. Bivariate polar plots and HYSPLIT model were used to identify the source regions of GEM on a local and regional scale. The results indicate that GEM concentrations of air masses from all directions in January 2015 were higher than those of other years. Generalized Additive Models (GAMs), a regression analysis method, were established and applied to investigate the influencing factors on the inter-annual trend of GEM. The factors, anthropogenic emissions, meteorological conditions and transmission explained 26.9 ± 11.4 %, 45.7 ± 7.2 % and 27.4 ± 6.8 % to the variation of GEM concentrations, respectively. Among them, the interpretation rate of anthropogenic emissions has generally decreased since 2012, whereas meteorology explained the largest proportion of GEM concentrations in almost all study periods. Our results suggest that meteorology was the more important factor, which driven the inter-annual trend of GEM in the study region.

Jiayan Shi et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-367', Anonymous Referee #1, 04 Jun 2022
  • RC2: 'Comment on acp-2022-367', Anonymous Referee #2, 12 Jun 2022
  • CC1: 'Comment on acp-2022-367', Xinbin Feng, 18 Jun 2022

Jiayan Shi et al.

Data sets

Measurement report: Atmospheric mercury in a coastal city of Southeast China: inter-annual variations and influencing factors Jiayan Shi https://doi.org/10.5281/zenodo.6573605

Jiayan Shi et al.

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Short summary
Gaseous elemental mercury (GEM) along with conventional air pollutants and meteorological parameters were simultaneously observed in Southeast China over the period 2012–2020. The observed GEM concentrations showed no distinct inter-annual trends. The interpretation rate of anthropogenic emissions decreased among years, but meteorological conditions was likely the more important factor driving the inter-annual trend of GEM in the study region.
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