Observations of Reactive Gaseous Mercury in the Free Troposphere at the Mount Bachelor Observatory

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Observations of Reactive Gaseous Mercury in the Free Troposphere at the Mount Bachelor Observatory

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dc.contributor.author Swartzendruber, Philip C.
dc.contributor.author Jaffe, Daniel A.
dc.contributor.author Prestbo, E. M.
dc.contributor.author Weiss-Penzias, P.
dc.contributor.author Selin, Noelle E.
dc.contributor.author Park, Rokjin
dc.contributor.author Jacob, Daniel J.
dc.contributor.author Strode, Sarah
dc.contributor.author Jaegle, Lyatt
dc.date.accessioned 2010-03-22T19:32:08Z
dc.date.issued 2006
dc.identifier.citation Swartzendruber, Philip C., Daniel A. Jaffe, E. M. Prestbo, P. Weiss-Penzias, Noelle E. Selin, Rokjin Park, Daniel J. Jacob, Sarah Strode, and Lyatt Jaegle. 2006. Observations of reactive gaseous mercury in the free troposphere at the Mount Bachelor Observatory. Journal of Geophysical Research 111: D24301. en_US
dc.identifier.issn 0148-0227 en_US
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:3743673
dc.description.abstract We measured gaseous elemental mercury (GEM), particulate mercury (PHg), and reactive gaseous mercury (RGM), along with CO, ozone, and aerosol scatter at the Mount Bachelor Observatory (2.7 km above sea level), Oregon, from May to August 2005. The mean mercury concentrations (at standard conditions) were 1.54 ng/m3 (GEM), 5.2 pg/m3 (PHg), and 43 pg/m3 (RGM). RGM enhancements, up to 600 pg/m3, occurred at night and were linked to a diurnal pattern of upslope and downslope flows that mixed in boundary layer air during the day and free tropospheric air at night. During the night, RGM was inversely correlated (P < 0.0001) with CO (r = −0.36), GEM (r = −0.73), and H2O (r = −0.44), was positively correlated with ozone (r = 0.38), and could not be linked to recent anthropogenic emissions from local sources or long-range transport. Principal component analysis and a composite of change in RGM versus change in GEM during RGM enhancements indicate that a nearly quantitative shift in speciation is associated with increases in ozone and decreases in water vapor and CO. This argues that high concentrations of RGM are present in the free troposphere because of in situ oxidation of GEM to RGM. A global chemical transport model reproduces the RGM mean and diurnal pattern but underestimates the magnitude of the largest observed enhancements. Since the only modeled, in situ RGM production mechanisms are oxidation of GEM by ozone and OH, this implies that there are faster reaction rates or additional RGM production mechanisms in the free troposphere. en_US
dc.description.sponsorship Earth and Planetary Sciences en_US
dc.description.sponsorship Engineering and Applied Sciences en_US
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.isversionof doi:10.1029/2006JD007415 en_US
dash.license LAA
dc.title Observations of Reactive Gaseous Mercury in the Free Troposphere at the Mount Bachelor Observatory en_US
dc.type Journal Article en_US
dc.description.version Version of Record en_US
dc.relation.journal Journal of Geophysical Research en_US
dash.depositing.author Jacob, Daniel J.
dc.date.available 2010-03-22T19:32:08Z

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  • FAS Scholarly Articles [6463]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University

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