Bromide and other ions in the snow, firn air, and atmospheric boundary layer at Summit during GSHOX
Measurements of gas phase soluble bromide in the boundary layer and in firn air, and Br− in aerosol and snow, were made at Summit, Greenland (72.5° N, 38.4° W, 3200 m a.s.l.) as part of a larger investigation into the influence of Br chemistry on HOx cycling. The soluble bromide measurements confirm...
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ftuninhampshire:oai:scholars.unh.edu:earthsci_facpub-1068 2023-05-15T14:29:17+02:00 Bromide and other ions in the snow, firn air, and atmospheric boundary layer at Summit during GSHOX Dibb, Jack E. Ziemba, Luke D Luxford, J Beckman, P 2010-10-20T07:00:00Z application/pdf https://scholars.unh.edu/earthsci_facpub/69 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1068&context=earthsci_facpub unknown University of New Hampshire Scholars' Repository https://scholars.unh.edu/earthsci_facpub/69 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1068&context=earthsci_facpub © Author(s) 2010. This work is distributed under the Creative Commons Attribution 3.0 License. CC-BY Earth Sciences Scholarship Atmospheric Sciences text 2010 ftuninhampshire 2023-01-30T21:34:09Z Measurements of gas phase soluble bromide in the boundary layer and in firn air, and Br− in aerosol and snow, were made at Summit, Greenland (72.5° N, 38.4° W, 3200 m a.s.l.) as part of a larger investigation into the influence of Br chemistry on HOx cycling. The soluble bromide measurements confirm that photochemical activation of Br− in the snow causes release of active Br to the overlying air despite trace concentrations of Br− in the snow (means 15 and 8 nmol Br− kg−1 of snow in 2007 and 2008, respectively). Mixing ratios of soluble bromide above the snow were also found to be very small (mean <1 ppt both years, with maxima of 3 and 4 ppt in 2007 and 2008, respectively), but these levels clearly oxidize and deposit long-lived gaseous elemental mercury and may perturb HOx partitioning. Concentrations of Br− in surface snow tended to increase/decrease in parallel with the specific activities of the aerosol-associated radionuclides 7Be and 210Pb. Earlier work has shown that ventilation of the boundary layer causes simultaneous increases in 7Be and 210Pb at Summit, suggesting there is a pool of Br in the free troposphere above Summit in summer time. Speciation and the source of this free tropospheric Br− are not well constrained, but we suggest it may be linked to extensive regions of active Br chemistry in the Arctic basin which are known to cause ozone and mercury depletion events shortly after polar sunrise. If this hypothesis is correct, it implies persistence of the free troposphere Br− for several months after peak Br activation in March/April. Alternatively, there may be a ubiquitous pool of Br− in the free troposphere, sustained by currently unknown sources and processes. Text Arctic Basin Arctic Greenland University of New Hampshire: Scholars Repository Arctic Greenland |
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University of New Hampshire: Scholars Repository |
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ftuninhampshire |
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topic |
Atmospheric Sciences |
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Atmospheric Sciences Dibb, Jack E. Ziemba, Luke D Luxford, J Beckman, P Bromide and other ions in the snow, firn air, and atmospheric boundary layer at Summit during GSHOX |
topic_facet |
Atmospheric Sciences |
description |
Measurements of gas phase soluble bromide in the boundary layer and in firn air, and Br− in aerosol and snow, were made at Summit, Greenland (72.5° N, 38.4° W, 3200 m a.s.l.) as part of a larger investigation into the influence of Br chemistry on HOx cycling. The soluble bromide measurements confirm that photochemical activation of Br− in the snow causes release of active Br to the overlying air despite trace concentrations of Br− in the snow (means 15 and 8 nmol Br− kg−1 of snow in 2007 and 2008, respectively). Mixing ratios of soluble bromide above the snow were also found to be very small (mean <1 ppt both years, with maxima of 3 and 4 ppt in 2007 and 2008, respectively), but these levels clearly oxidize and deposit long-lived gaseous elemental mercury and may perturb HOx partitioning. Concentrations of Br− in surface snow tended to increase/decrease in parallel with the specific activities of the aerosol-associated radionuclides 7Be and 210Pb. Earlier work has shown that ventilation of the boundary layer causes simultaneous increases in 7Be and 210Pb at Summit, suggesting there is a pool of Br in the free troposphere above Summit in summer time. Speciation and the source of this free tropospheric Br− are not well constrained, but we suggest it may be linked to extensive regions of active Br chemistry in the Arctic basin which are known to cause ozone and mercury depletion events shortly after polar sunrise. If this hypothesis is correct, it implies persistence of the free troposphere Br− for several months after peak Br activation in March/April. Alternatively, there may be a ubiquitous pool of Br− in the free troposphere, sustained by currently unknown sources and processes. |
format |
Text |
author |
Dibb, Jack E. Ziemba, Luke D Luxford, J Beckman, P |
author_facet |
Dibb, Jack E. Ziemba, Luke D Luxford, J Beckman, P |
author_sort |
Dibb, Jack E. |
title |
Bromide and other ions in the snow, firn air, and atmospheric boundary layer at Summit during GSHOX |
title_short |
Bromide and other ions in the snow, firn air, and atmospheric boundary layer at Summit during GSHOX |
title_full |
Bromide and other ions in the snow, firn air, and atmospheric boundary layer at Summit during GSHOX |
title_fullStr |
Bromide and other ions in the snow, firn air, and atmospheric boundary layer at Summit during GSHOX |
title_full_unstemmed |
Bromide and other ions in the snow, firn air, and atmospheric boundary layer at Summit during GSHOX |
title_sort |
bromide and other ions in the snow, firn air, and atmospheric boundary layer at summit during gshox |
publisher |
University of New Hampshire Scholars' Repository |
publishDate |
2010 |
url |
https://scholars.unh.edu/earthsci_facpub/69 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1068&context=earthsci_facpub |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Basin Arctic Greenland |
genre_facet |
Arctic Basin Arctic Greenland |
op_source |
Earth Sciences Scholarship |
op_relation |
https://scholars.unh.edu/earthsci_facpub/69 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1068&context=earthsci_facpub |
op_rights |
© Author(s) 2010. This work is distributed under the Creative Commons Attribution 3.0 License. |
op_rightsnorm |
CC-BY |
_version_ |
1766303338317479936 |