Understanding the fate of Arctic atmospheric mercury (Hg) deposition – A Hg stable isotope investigation of redox processes and Hg re-emissions

Información del proyecto

MEROXRE

Identificador del acuerdo de subvención: 657195

DOI

10.3030/657195

Proyecto cerrado

Fecha de la firma de la CE 12 Marzo 2015

Fecha de inicio 1 Abril 2015

Fecha de finalización 31 Marzo 2017

Financiado con arreglo a

• EXCELLENT SCIENCE - Marie Skłodowska-Curie Actions

Coste total

€ 173 076,00

Aportación de la UE

€ 173 076,00

Coordinado por

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS
France

Objetivo

Mercury (Hg) is a pollutant of global concern for human and ecosystem health. This is particularly true in the Arctic where indigenous populations are excessively exposed to dietary Hg from fish and marine mammal consumption. The deposition of Hg from the atmosphere to Earth surfaces and its re-emission via biogeochemical reduction processes determine Hg concentrations in Earth surface reservoirs, such as soils, snow, and runoff into Arctic lakes and surface Ocean. In order to predict the impact of anthropogenic Hg emissions on net atmospheric Hg deposition and ultimately Hg concentrations in biota, it is important to understand these deposition and re-emission processes. The reduction of deposited Hg2+ to volatile gaseous Hg0 and the oxidation of gaseous Hg0 to reactive Hg2+, which is rapidly deposited from the atmosphere, control the global fate of Hg. Major knowledge gaps concerning the mechanisms of these redox processes exist.
Different photochemical and non-photochemical Hg2+ reduction mechanisms were found to fractionate Hg stable isotopes in distinct, identifiable ways. Also, different atmospheric Hg0 and Hg2+ pools have been shown to have distinguishable Hg isotope signatures. Hg isotopes can thus provide new insights in the sources of Hg and redox transformation processes at the Earth-atmosphere interface, which are inaccessible by means of concentration and flux measurements alone. In the MEROXRE project proposed here we will combine the latest innovations in gaseous Hg measurements in porous media (soils, snow) with state-of-the-art Hg isotope techniques to investigate:
(i) Hg isotope fractionation of Hg2+ reduction and gaseous Hg0 oxidation in interstitial snow air and soil pores.
(ii) Hg isotope fractionation factors associated with net gaseous Hg0 re-emission fluxes from soil and snow
(iii) the importance of gaseous Hg0 oxidation and Hg2+ reduction and re-emission for the global Hg cycle by incorporating the results in a global Hg isotope model.

Ámbito científico (EuroSciVoc)

• ciencias naturales › ciencias químicas › electroquímica › electrólisis
• ciencias naturales › ciencias químicas › química inorgánica › metales de transición
• ciencias naturales › ciencias biológicas › zoología › mamalogía › cetología
• ciencias naturales › ciencias biológicas › ecología › ecosistemas
• ciencias naturales › ciencias de la tierra y ciencias ambientales conexas › ciencias de la atmósfera › climatología › cambios climáticos

Palabras clave

• mercury
• stable isotopes
• Arctic
• deposition
• emission

Programa(s)

• H2020-EU.1.3. - EXCELLENT SCIENCE - Marie Skłodowska-Curie Actions PROGRAMA PRINCIPAL
  
• H2020-EU.1.3.2. - Nurturing excellence by means of cross-border and cross-sector mobility
  

Tema(s)

• MSCA-IF-2014-EF - Marie Skłodowska-Curie Individual Fellowships (IF-EF)
  

Régimen de financiación

MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)

Convocatoria de propuestas

H2020-MSCA-IF-2014

Coordinador

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS

• Aportación neta de la UEn: € 173 076,00
• Dirección: RUE MICHEL ANGE 3 ; 75794 PARIS ; Francia
• Región: Ile-de-France › Ile-de-France › Hauts-de-Seine
• Tipo de actividad: Research Organisations
• Coste total: € 173 076,00