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  • 2005-2009  (2)
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  • 2005-2009  (2)
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  • 1
    Online Resource
    Online Resource
    Chasing quicksilver northward: mercury chemistry in the Arctic troposphere
    CSIRO Publishing ; 2008
    In:  Environmental Chemistry Vol. 5, No. 2 ( 2008), p. 131-
    Details
    In: Environmental Chemistry, CSIRO Publishing, Vol. 5, No. 2 ( 2008), p. 131-
    Abstract: Environmental Context. ‘Mercurial storms rage over the Arctic’ wrote Fred Pearce in New Scientist in June of 1997: he was referring to the recent discovery by Bill Schroeder and his colleagues (Nature, Vol. 394, 1998) of periods soon after Arctic dawn when the concentration of mercury in the atmosphere literally plummets to levels so low that they can be undetectable, even by the most sensitive of modern instruments. A decade and many measurement campaigns later, we think we understand how these so-called depletion events occur, if not all the mechanisms that go towards providing the conditions for them to happen. Nor do we really know what happens to the mercury removed from the atmosphere; the fear is that it is deposited and enters the Arctic ecosystem, where it is potentially extremely harmful. The present study questions whether that fear is grounded. Abstract. The tropospheric boundary layer chemistry of Hg has been simulated using a two-phase photochemical box model to see if our current (experimental and theoretical) understanding of Hg(g)0 reaction rates can account for the depletion events seen during Arctic spring, when the so-called ‘bromine explosion’ in the model is constrained by the measured ozone depletion rate. The simulations reveal that the observed rate of Hg(g)0 depletion can be accounted for; however, the measured concentrations of gas-phase oxidised Hg and HgP (Hg associated with particulate matter) cannot. Simulating the emission of Hg(g)0 from the snow pack to mimic the observed concentration recovery after a depletion event suggests the net Hg deposition from a depletion event is all but irrelevant.
    Type of Medium: Online Resource
    ISSN: 1448-2517
    URL: Article
    DOI: 10.1071/EN08001
    Language: English
    Publisher: CSIRO Publishing
    Publication Date: 2008
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  • 2
    Online Resource
    Online Resource
    Integrated mercury cycling, transport, and air-water exchange (MECAWEx) model
    American Geophysical Union (AGU) ; 2006
    In:  Journal of Geophysical Research Vol. 111, No. D20 ( 2006-10-18)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 111, No. D20 ( 2006-10-18)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2006JD007117
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2006
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    detail.hit.zdb_id: 161666-3
    detail.hit.zdb_id: 161667-5
    detail.hit.zdb_id: 2969341-X
    detail.hit.zdb_id: 161665-1
    detail.hit.zdb_id: 3094268-8
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    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
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    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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