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Istituto sull'inquinamento atmosferico

Torna all'elenco Contributi in rivista anno 2017

Contributo in rivista

Tipo: Articolo in rivista

Titolo: Four years of atmospheric mercury records in Northwestern Patagonia (Argentina): potential sources, concentration patterns and influence of environmental variables observed at the GMOS EMMA station

Anno di pubblicazione: 2017

Formato: Elettronico

Autori: Maria C. Diéguez1, Patricia E. Garcia1, Mariantonia Bencardino2, Francesco D'Amore2, Jessica Castagna2, Sergio Ribeiro Guevara3, and Francesca Sprovieri2

Affiliazioni autori: 1Laboratorio de Fotobiología, INIBIOMA, CONICET-Universidad Nacional del Comahue, Quintral 1250, 8400, Bariloche, Argentina 2CNR-Institute of Atmospheric Pollution Research, Rende, Italy 3Laboratorio de Análisis por Activación Neutrónica, Centro Atómico Bariloche, Comisión Nacional de Energía Atómica, Avda. Bustillo km 9, 8400, Bariloche, Argentina

Autori CNR:

  • MARIANTONIA BENCARDINO
  • FRANCESCO D'AMORE
  • FRANCESCA SPROVIERI

Lingua: inglese

Abstract: The Global Mercury Observation System (GMOS) project, has developed a global-scale network of ground-based atmospheric monitoring sites, expanding the coverage of atmospheric mercury (Hg) measurements worldwide and improving the understanding of global atmospheric Hg transport and deposition, particularly in regions of the South Hemisphere where atmospheric Hg observational data is limited. This work provides the first continuous records of gaseous elemental Hg (GEM) concentrations observed from October 2012 to May 2016 in Northwestern Patagonia (Argentina) at the GMOS EMMA monitoring station (41°7'43.82" S, 71°25'11.89" W, 803 m a.s.l). The monitoring site is located inside Nahuel Huapi National Park, a natural reserve in the Lake District of Andean Patagonia. The area is within the Southern Volcanic Zone, influenced by several active volcanoes aligned in the Andes cordillera. During the studied period, GEM concentrations ranged between 0.23 and 1.43 ng m-3, with an annual mean of 0.9 ± 0.15 ng m-3. GEM records at EMMA station resemble background concentrations measured in Antarctica and other remote locations of the Southern Hemisphere. GEM concentrations showed seasonal variation with mean values higher during spring (0.93 ± 0.13 ng m-3) and winter (0.92 ± 0.10 ng m-3) followed by summer (0.86 ± 0.15 ng m-3) and at last by autumn (0.81 ± 0.15 ng m-3). Further, a clear daily pattern was observed, with higher GEM levels during day-time than at night-time across all seasons. Multivariate analyses showed that GEM levels are chiefly determined by meteorological parameters, and, in particular by the westerly winds which represented the most influential variable on GEM records. In order to investigate the potential impact of natural and/or anthropogenic emission sources as well as the role played by the long-range transport on GEM levels, analyses of HYSPLIT backward trajectories (BWT) were carried out for different periods characterized by low and high GEM concentrations. The BWT analysis highlighted the influence of clean oceanic air masses and also of the local and regional active volcanoes in the Andes cordillera.

Lingua abstract: inglese

Rivista:

Atmospheric chemistry and physics discussion Copernicus Publ.
Paese di pubblicazione: Germania
Lingua: inglese
ISSN: 1680-7375

DOI: 10.5194/acp-2016-1076

Referee: Sì: Internazionale

Stato della pubblicazione: Published version

Parole chiave:

  • atmospheric mercury
  • Northwestern Patagonia
  • GMOS EMMA station
  • concentration patterns
  • South Hemisphere

Strutture CNR:

 
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