Constraints from observations and modeling on atmosphere–surface exchange of mercury in eastern North America

Abstract Atmosphere–surface exchange of mercury, although a critical component of its global cycle, is currently poorly constrained. Here we use the GEOS-Chem chemical transport model to interpret atmospheric Hg0 (gaseous elemental mercury) data collected during the 2013 summer Nitrogen, Oxidants, M...

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Bibliographic Details
Published in:Elementa: Science of the Anthropocene
Main Authors: Shaojie Song, Noelle E. Selin, Lynne E. Gratz, Jesse L. Ambrose, Daniel A. Jaffe, Viral Shah, Lyatt Jaeglé, Amanda Giang, Bin Yuan, Lisa Kaser, Eric C. Apel, Rebecca S. Hornbrook, Nicola J. Blake, Andrew J. Weinheimer, Roy L. Mauldin III, Christopher A. Cantrell, Mark S. Castro, Gary Conley, Thomas M. Holsen, Winston T. Luke, Robert Talbot
Format: Article in Journal/Newspaper
Language:English
Published: BioOne 2016
Subjects:
Hg emission
aircraft campaign
Northwest Atlantic
envir
geo
Online Access:https://doi.org/10.12952/journal.elementa.000100
https://doaj.org/article/ef588b2cd96c4db1862b02ace5abaf0f
Description
Summary:Abstract Atmosphere–surface exchange of mercury, although a critical component of its global cycle, is currently poorly constrained. Here we use the GEOS-Chem chemical transport model to interpret atmospheric Hg0 (gaseous elemental mercury) data collected during the 2013 summer Nitrogen, Oxidants, Mercury and Aerosol Distributions, Sources and Sinks (NOMADSS) aircraft campaign as well as ground- and ship-based observations in terms of their constraints on the atmosphere–surface exchange of Hg0 over eastern North America. Model–observation comparison suggests that the Northwest Atlantic may be a net source of Hg0, with high evasion fluxes in summer (our best sensitivity simulation shows an average oceanic Hg0 flux of 3.3 ng m-2 h-1 over the Northwest Atlantic), while the terrestrial ecosystem in the summer of the eastern United States is likely a net sink of Hg0 (our best sensitivity simulation shows an average terrestrial Hg0 flux of -0.6 ng m-2 h-1 over the eastern United States). The inferred high Hg0 fluxes from the Northwest Atlantic may result from high wet deposition fluxes of oxidized Hg, which are in turn related to high precipitation rates in this region. We also find that increasing simulated terrestrial fluxes of Hg0 in spring compared to other seasons can better reproduce observed seasonal variability of Hg0 concentration at ground-based sites in eastern North America.

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