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Istituto sull'inquinamento atmosferico

Torna all'elenco Contributi in rivista anno 2015

Contributo in rivista

Tipo: Articolo in rivista

Titolo: Observational and Modeling Constraints on Global Anthropogenic Enrichment of Mercury

Anno di pubblicazione: 2015

Formato: Cartaceo

Autori: Amos, Helen M.; Sonke, Jeroen E.; Obrist, Daniel; Robins, Nicholas; Hagan, Nicole; Horowitz, Hannah M.; Mason, Robert P.; Witt, Melanie; Hedgecock, Ian M.; Corbitt, Elizabeth S.; Sunderland, Elsie M.

Affiliazioni autori: Harvard Univ; Univ Toulouse 3; Desert Res Inst; N Carolina State Univ; Environm Hlth Council; Harvard Univ; Univ Connecticut; Univ Oxford; CNR; Harvard Univ

Autori CNR:

  • IAN MICHAEL HEDGECOCK

Lingua: inglese

Abstract: Centuries of anthropogenic releases have releases in a global legacy of mercury (Hg) contamination. Here we use a global model to quantify the impact of uncertainty in Hg atmospheric emissions and cycling -On anthropogenic enrichment and discuss implications for future Hg levels. The plausibility of sensitivity simulations is evaluated against multiple independent lines of Observation, including natural archives and direct measurements of present-day environmental Hg concentrations. It has been previously reported that pre-industriaVenrichment recorded in sediment and peat disagree by more than a factor of 10. We find this difference is largely erroneous and caused by comparing peat and sediment against different reference time periods. After correcting this inconsistenr-yi, median enrichment in Hg accumulation since pre-industrial 1760 to 1880 is a factor of 4.3 for peat and 3.0 for sediment. Pre-industrial accumulation in peat and sediment is a factor of greater than the precolonial era (3000-BC to 1550 AD). Model scenarios that omit atmospheric emissions of Hg,froin early mining are inconsistent with observational constraints on the present-day atmospheric, oceanic, and soil Hg reservoirs, as well as the magnitude of enrichment in archives. Future reductions in anthropogenic emissions will initiate a decline in atmospheric concentrations within 1 year, but stabilization of subsurface and deep oaearr Hg levels requires aggressive controls. These findings are robust to the ranges of uncertainty in past emissions arid Hg cycling.

Lingua abstract: inglese

Pagine da: 4036

Pagine a: 4047

Pagine totali: 12

Rivista:

Environmental science & technology American Chemical Society,
Paese di pubblicazione: Stati Uniti d'America
Lingua: inglese
ISSN: 0013-936X

Numero volume: 49

Numero fascicolo: 7

DOI: 10.1021/es5058665

Stato della pubblicazione: Published version

Indicizzato da:

  • ISI Web of Science (WOS) [000352659000006]
  • Scopus [2-s2.0-84926501161]

Parole chiave:

  • Mercury
  • legacy
  • cycling

URL: http://pubs.acs.org/doi/abs/10.1021/es5058665

Data di accettazione: 09/03/2015

Strutture CNR:

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