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Volume 17, issue 4 | Copyright

Special issue: Global Mercury Observation System – Atmosphere...

Atmos. Chem. Phys., 17, 2689-2708, 2017
https://doi.org/10.5194/acp-17-2689-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 22 Feb 2017

Research article | 22 Feb 2017

Five-year records of mercury wet deposition flux at GMOS sites in the Northern and Southern hemispheres

Francesca Sprovieri1, Nicola Pirrone2, Mariantonia Bencardino1, Francesco D'Amore1, Helene Angot3, Carlo Barbante9,16, Ernst-Günther Brunke4, Flor Arcega-Cabrera14, Warren Cairns16, Sara Comero7, María del Carmen Diéguez6, Aurélien Dommergue3, Ralf Ebinghaus5, Xin Bin Feng11, Xuewu Fu11, Patricia Elizabeth Garcia6, Bernd Manfred Gawlik7, Ulla Hageström8, Katarina Hansson8, Milena Horvat10, Jože Kotnik10, Casper Labuschagne4, Olivier Magand3, Lynwill Martin4, Nikolay Mashyanov12, Thumeka Mkololo4, John Munthe8, Vladimir Obolkin15, Martha Ramirez Islas13, Fabrizio Sena7, Vernon Somerset17, Pia Spandow8, Massimiliano Vardè1,16, Chavon Walters17, Ingvar Wängberg8, Andreas Weigelt5, Xu Yang11, and Hui Zhang11 Francesca Sprovieri et al.
  • 1CNR Institute of Atmospheric Pollution Research, Rende, Italy
  • 2CNR Institute of Atmospheric Pollution Research, Rome, Italy
  • 3University Grenoble Alpes, CNRS, IRD, IGE, Grenoble, France
  • 4Cape Point GAW Station, Climate and Environment Research & Monitoring, South African Weather Service, Stellenbosch, South Africa
  • 5Helmholtz-Zentrum, Geesthacht, Germany
  • 6INIBIOMA-CONICET-UNComa, Bariloche, Argentina
  • 7Joint Research Centre, Ispra, Italy
  • 8IVL, Swedish Environmental Research Inst. Ltd., Göteborg, Sweden
  • 9University Ca' Foscari of Venice, Venice, Italy
  • 10Jožef Stefan Institute, Ljubljana, Slovenia
  • 11Institute of Geochemistry, State Key Laboratory of Environmental Geochemistry, Chinese Academy of Sciences, Guiyang, China
  • 12St. Petersburg State University, St. Petersburg, Russia
  • 13Instituto Nacional de Ecología y Cambio Climático (INECC), Mexico City, Mexico
  • 14Universidad Nacional Autónoma de México (UNAM), Unidad de Química, Sisal, Mexico
  • 15Limnological Institute SB RAS, Irkutsk, Russia
  • 16CNR Institute for the Dynamics of Environmental Processes, Venice, Italy
  • 17Natural Resources and the Environment (NRE), Council for Scientific and Industrial Research (CSIR), 7600 Stellenbosch, South Africa

Abstract. The atmospheric deposition of mercury (Hg) occurs via several mechanisms, including dry and wet scavenging by precipitation events. In an effort to understand the atmospheric cycling and seasonal depositional characteristics of Hg, wet deposition samples were collected for approximately 5 years at 17 selected GMOS monitoring sites located in the Northern and Southern hemispheres in the framework of the Global Mercury Observation System (GMOS) project. Total mercury (THg) exhibited annual and seasonal patterns in Hg wet deposition samples. Interannual differences in total wet deposition are mostly linked with precipitation volume, with the greatest deposition flux occurring in the wettest years. This data set provides a new insight into baseline concentrations of THg concentrations in precipitation worldwide, particularly in regions such as the Southern Hemisphere and tropical areas where wet deposition as well as atmospheric Hg species were not investigated before, opening the way for future and additional simultaneous measurements across the GMOS network as well as new findings in future modeling studies.

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The results on total mercury (THg) wet deposition flux obtained within the GMOS network have been presented and discussed to understand the atmospheric Hg cycling and its seasonal depositional patterns over the 2011–2015 period. The data set provides new insight into baseline concentrations of THg concentrations in precipitation particularly in regions where wet deposition and atmospheric Hg species were not investigated before, opening the way for additional measurements and modeling studies.
The results on total mercury (THg) wet deposition flux obtained within the GMOS network have...
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