Explaining trends in tropospheric mercury using global modeling
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Selin_Explaining trends.pdf
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811.4 KB
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Adobe PDF
Checksum (MD5)
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Author(s)
Song, Shaojie
Selin, Noelle E
Date Issued
April 2013
Journal
E3S Web of Conferences
Citation
Selin, N. E., and S. Song. “Explaining Trends in Tropospheric Mercury Using Global Modeling.” Edited by Nicola Pirrone. E3S Web of Conferences 1 (2013): 07003.
Version
Final published version
Abstract
Multiple observational analyses have identified a decreasing trend over the past decade in surface concentrations of gaseous elemental mercury (GEM), from sites in both the Northern and Southern hemisphere. We use two model-based approaches to identify sets of parameters that could quantitatively explain observed trends in mercury. Using a 12-box model, we quantify which combinations of factors including changes in anthropogenic emissions, oceanic and land evasion, and atmospheric oxidation rates that can explain observed tropospheric mercury decreases. We then use the GEOS-Chem chemical transport model to further examine source attribution at measurement sites where decreasing trends have been observed. We combine these analyses to generate quantitative hypotheses to explain observed trends. We suggest that the tropospheric decline may be best explained by multiple, reinforcing factors.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Massachusetts Institute of Technology. Engineering Systems Division
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1051/e3sconf/20130107003
