Chemical cycling and deposition of atmospheric mercury in polar regions: review of recent measurements and comparison with models
Artikel i vetenskaplig tidskrift, 2016

Mercury (Hg) is a worldwide contaminant that can cause adverse health effects to wildlife and humans. While atmospheric modeling traces the link from emissions to deposition of Hg onto environmental surfaces, large uncertainties arise from our incomplete understanding of atmospheric processes (oxidation pathways, deposition, and re-emission). Atmospheric Hg reactivity is exacerbated in high latitudes and there is still much to be learned from polar regions in terms of atmospheric processes. This paper provides a synthesis of the atmospheric Hg monitoring data available in recent years (2011-2015) in the Arctic and in Antarctica along with a comparison of these observations with numerical simulations using four cutting-edge global models. The cycle of atmospheric Hg in the Arctic and in Antarctica presents both similarities and differences. Coastal sites in the two regions are both influenced by springtime atmospheric Hg depletion events and by summertime snowpack re-emission and oceanic evasion of Hg. The cycle of atmospheric Hg differs between the two regions primarily because of their different geography. While Arctic sites are significantly influenced by northern hemispheric Hg emissions especially in winter, coastal Antarctic sites are significantly influenced by the reactivity observed on the East Antarctic ice sheet due to katabatic winds. Based on the comparison of multi-model simulations with observations, this paper discusses whether the processes that affect atmospheric Hg seasonality and inter-annual variability are appropriately represented in the models and identifies research gaps in our understanding of the atmospheric Hg cycling in high latitudes.

Författare

H. Angot

Université Grenoble Alpes

A. Dastoor

Environment Canada

F. De Simone

CNR-Institute of Atmospheric Pollution Research, Rende

Katarina Gårdfeldt

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

C. N. Gencarelli

CNR-Institute of Atmospheric Pollution Research, Rende

I. M. Hedgecock

CNR-Institute of Atmospheric Pollution Research, Rende

Sarka Langer

IVL Svenska Miljöinstitutet AB

O. Magand

Université Grenoble Alpes

LGGE Laboratoire de Glaciologie et Geophysique de l'Environnement

Michelle Nerentorp

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

C. Nordstrom

Danmarks Miljoundersogelser

K. A. Pfaffhuber

Norsk institutt for luftforskning (NILU)

N. Pirrone

CNR-Institute of Atmospheric Pollution Research, Rome

A. Ryjkov

Environment Canada

N. E. Selin

Massachusetts Institute of Technology (MIT)

H. Skov

Danmarks Miljoundersogelser

S. J. Song

Massachusetts Institute of Technology (MIT)

F. Sprovieri

CNR-Institute of Atmospheric Pollution Research, Rende

A. Steffen

Environment Canada

K. Toyota

Environment Canada

O. Travnikov

Meteorological Synthesizing Centre

X. Yang

British Antarctic Survey

A. Dommergue

Université Grenoble Alpes

LGGE Laboratoire de Glaciologie et Geophysique de l'Environnement

Atmospheric Chemistry and Physics

1680-7316 (ISSN) 1680-7324 (eISSN)

Vol. 16 16 10735-10763

Drivkrafter

Hållbar utveckling

Ämneskategorier

Geovetenskap och miljövetenskap

DOI

10.5194/acp-16-10735-2016