Home |  English version |  Mappa |  Commenti |  Sondaggio |  Staff |  Contattaci Cerca nel sito  
Istituto sull'inquinamento atmosferico

Torna all'elenco Contributi in rivista anno 2017

Contributo in rivista

Tipo: Articolo in rivista

Titolo: Multi-model study of mercury dispersion in the atmosphere: Atmospheric processes and model evaluation

Anno di pubblicazione: 2017

Autori: Travnikov O.; Angot H.; Artaxo P.; Bencardino M.; Bieser J.; D'Amore F.; Dastoor A.; De Simone F.; DIeguez M.C.; Dommergue A.; Ebinghaus R.; Bin Feng X.; Gencarelli C.N.; Hedgecock I.M.; Magand O.; Martin L.; Matthias V.; Mashyanov N.; Pirrone N.; Ramachandran R.; Alana Read K.; Ryjkov A.; Selin N.E.; Sena F.; Song S.; Sprovieri F.; Wip D.; Wangberg I.; Yang X.

Affiliazioni autori: Meteorological Synthesizing Centre, East of EMEP, Moscow, , Russian Federation; University Grenoble Alpes, CNRS, IRD, Grenoble, , , , France; University Grenoble Alpes, CNRS, IRD, Grenoble, , , , France; University Grenoble Alpes, CNRS, IRD, Grenoble, , , , France; University of Sao Paulo, Sao Paulo, Brazil, , Brazil; CNR, Institute of Atmospheric Pollution Research, Rende, , , Italy; CNR, Institute of Atmospheric Pollution Research, Rende, , , Italy; Institute of Coastal Research, Helmholtz-Zentrum Geesthacht, Geesthacht, , Germany; Air Quality Research Division, Environment and Climate Change Canada, Dorval, QC, , Canada; INIBIOMA, CONICET, Bariloche, AR, , , Argentina; INIBIOMA, CONICET, Bariloche, AR, , , Argentina; CNRS, Laboratoire de Glaciologie et Geóphysique de l'Environnement, Grenoble, , , France; CNRS, Laboratoire de Glaciologie et Geóphysique de l'Environnement, Grenoble, , , France; Institute of Geochemistry, State Key Laboratory of Environmental Geochemistry, Chinese Academy of Sciences, Guiyang, , , China; Institute of Geochemistry, State Key Laboratory of Environmental Geochemistry, Chinese Academy of Sciences, Guiyang, , , China; Cape Point GAW Station, Climate and Environment Research and Monitoring, South African Weather Service, Stellenbosch, , South Africa; St. Petersburg State University, St. Petersburg, , Russian Federation; CNR, Institute of Atmospheric Pollution Research, Rome, , , Italy; CNR, Institute of Atmospheric Pollution Research, Rome, , , Italy; Institute for Ocean Management, Anna University, Chennai, , India; NCAS, University of York, York, UK, , United Kingdom; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, , United States; Institute for Data, Systems, and Society, Massachusetts Institute of Technology, Cambridge, MA, , United States; Joint Research Centre, Ispra, , Italy; Department of Physics, University of Suriname, Paramaribo, , Suriname; IVL Swedish Environmental Research Institute, Göteborg, , Sweden; British Antarctic Survey, Cambridge, , United Kingdom; Institute for Data, Systems and Society, Massachusetts Institute of Technology, Cambridge, MA, , United States

Autori CNR:

  • MARIANTONIA BENCARDINO
  • FRANCESCO D'AMORE
  • FRANCESCO DE SIMONE
  • IAN MICHAEL HEDGECOCK
  • NICOLA PIRRONE
  • FRANCESCA SPROVIERI

Lingua: inglese

Abstract: Current understanding of mercury (Hg) behavior in the atmosphere contains significant gaps. Some key characteristics of Hg processes, including anthropogenic and geogenic emissions, atmospheric chemistry, and air-surface exchange, are still poorly known. This study provides a complex analysis of processes governing Hg fate in the atmosphere involving both measured data from ground-based sites and simulation results from chemical transport models. A variety of long-term measurements of gaseous elemental Hg (GEM) and reactive Hg (RM) concentration as well as Hg wet deposition flux have been compiled from different global and regional monitoring networks. Four contemporary global-scale transport models for Hg were used, both in their state-of-the-art configurations and for a number of numerical experiments to evaluate particular processes. Results of the model simulations were evaluated against measurements. As follows from the analysis, the interhemispheric GEM gradient is largely formed by the prevailing spatial distribution of anthropogenic emissions in the Northern Hemisphere. The contributions of natural and secondary emissions enhance the south-to-north gradient, but their effect is less significant. Atmospheric chemistry has a limited effect on the spatial distribution and temporal variation of GEM concentration in surface air. In contrast, RM air concentration and wet deposition are largely defined by oxidation chemistry. The Br oxidation mechanism can reproduce successfully the observed seasonal variation of the RM / GEM ratio in the near-surface layer, but it predicts a wet deposition maximum in spring instead of in summer as observed at monitoring sites in North America and Europe. Model runs with OH chemistry correctly simulate both the periods of maximum and minimum values and the amplitude of observed seasonal variation but shift the maximum RM / GEM ratios from spring to summer. O3 chemistry does not predict significant seasonal variation of Hg oxidation. Hence, the performance of the Hg oxidation mechanisms under study differs in the extent to which they can reproduce the various observed parameters. This variation implies possibility of more complex chemistry and multiple Hg oxidation pathways occurring concurrently in various parts of the atmosphere.

Lingua abstract: inglese

Pagine da: 5271

Pagine a: 5295

Rivista:

Atmospheric chemistry and physics Copernicus Publ.
Paese di pubblicazione: Germania
Lingua: inglese
ISSN: 1680-7316

Numero volume: 17

DOI: 10.5194/acp-17-5271-2017

Referee: Sì: Internazionale

Stato della pubblicazione: Published version

Indicizzato da: Scopus [2-s2.0-85018624689]

Parole chiave:

  • ECHMERIT
  • Transport Models
  • Mercury Chemistry

URL: http://www.scopus.com/record/display.url?eid=2-s2.0-85018624689&origin=inward

Strutture CNR:

 
Torna indietro Richiedi modifiche Invia per email Stampa
Home Il CNR  |  I servizi News |   Eventi | Istituti |  Focus