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| Titel |
1D modeling of snow photochemistry at Summit Greenland |
| VerfasserIn |
J. L. Thomas, J. Stutz, R. von Glasow |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250026104
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| Zusammenfassung |
| Reactive halogens in Arctic regions and their impact on ozone levels have been a subject of
intensive research since the mid 1980s, in particular in regions close to first-year sea ice.
Motivated by indirect evidence that reactive halogens are also present on the Greenland ice
shield, two field campaigns have been conducted at Summit, Greenland in 2007 and 2008.
The purpose of these studies was to measure air and snow properties with a particular focus
on halogen and HOx chemistry in snow covered remote regions. Initial results show
evidence for halogen chemistry with BrO concentrations measured up to 3 ppt with
the UCLA long path DOAS instrument. In order to understand the chemical and
physical processes occurring during these field experiments we have developed a new
1D model for snow physics and chemistry. This model has been coupled to the
boundary layer model MISTRA, which includes detailed multiphase chemistry in
the atmosphere, with the goal of understanding how chemical species evolve with
time in the interstitial air and to study the interplay between the chemistry in and
above the snow. The importance of gas exchange will be highlighted as well at
the necessity for studies to quantify the ion content of the liquid layer on snow
grains. The methodology for modeling the multiphase in-snow chemistry will be
presented along with results from this new model, including vertical profiles of
halogens in the snow pack and in the atmosphere along with their evolution in time. |
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