Natural and anthropogenic atmospheric mercury in the European Arctic: a fractionation study
Open Access
- 1 July 2011
- journal article
- Published by Copernicus GmbH in Atmospheric Chemistry and Physics
- Vol. 11 (13), 6273-6284
- https://doi.org/10.5194/acp-11-6273-2011
Abstract
Gaseous elemental mercury (GEM) is converted to reactive gaseous mercury (RGM) during springtime Atmospheric Mercury Depletion Events (AMDE). This study reports the longest time series of GEM, RGM and particle-bound mercury (PHg) concentrations from a European Arctic site. From 27 April 2007 until 31 December 2008 composite GEM, RGM and PHg measurements were conducted in Ny-Ålesund (78° 54′ N, 11° 53′ E). The average concentrations of the complete dataset were 1.6 ± 0.3 ng m−3, 8 ± 13 pg m−3 and 8 ± 25 pg m−3 for GEM, RGM and PHg, respectively. For the complete dataset the atmospheric mercury distribution was 99 % GEM, whereas RGM and PHg constituted <1 %. The study revealed a seasonal distribution of GEM, RGM and PHg previously undiscovered in the Arctic. Increased concentrations of RGM were observed during the insolation period from March through August, while increased PHg concentrations occurred almost exclusively during the spring AMDE period in March and April. The elevated RGM concentrations suggest that atmospheric RGM deposition also occurs during the polar summer. RGM was suggested as the precursor for the PHg existence, but long range transportation of PHg has to be taken into consideration. Still there remain gaps in the knowledge of how RGM and PHg are related in the environment. RGM and PHg accounted for on average about 10 % of the depleted GEM during AMDEs. Although speculative, the fairly low RGM and PHg concentrations supported by the predominance of PHg with respect to RGM and no clear meteorological regime associated with these AMDEs would all suggest the events to be of non-local origin. With some exceptions, no clear meteorological regime was associated with the GEM, RGM and PHg concentrations throughout the year.This publication has 55 references indexed in Scilit:
- Global atmospheric model for mercury including oxidation by bromine atomsAtmospheric Chemistry and Physics, 2010
- Global Concentrations of Gaseous Elemental Mercury and Reactive Gaseous Mercury in the Marine Boundary LayerEnvironmental Science & Technology, 2010
- Circumpolar measurements of speciated mercury, ozone and carbon monoxide in the boundary layer of the Arctic OceanAtmospheric Chemistry and Physics, 2010
- Dynamic exchange of gaseous elemental mercury during polar night and dayAtmospheric Environment, 2009
- A synthesis of atmospheric mercury depletion event chemistry in the atmosphere and snowAtmospheric Chemistry and Physics, 2008
- Release of gaseous bromine from the photolysis of nitrate and hydrogen peroxide in simulated sea-salt solutionsAtmospheric Environment, 2007
- Arctic mercury depletion events at two elevations as observed at the Zeppelin Station and Dirigibile Italia, Ny-Ålesund, spring 2002Journal de Physique IV, 2003
- GOME observations of tropospheric BrO in northern hemispheric spring and summer 1997Geophysical Research Letters, 1998
- Measurements of biologically effective UV doses, total ozone abundances, and cloud effects with multichannel, moderate bandwidth filter instrumentsApplied Optics, 1996
- The cycle of atmospheric gases ‐ natural and man madeQuarterly Journal of the Royal Meteorological Society, 1972