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| Titel |
Modeling chemistry in and above snow at Summit, Greenland – Part 1: Model description and results |
| VerfasserIn |
J. L. Thomas, J. Stutz, B. Lefer, L. G. Huey, K. Toyota, J. E. Dibb, R. Glasow |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 10 ; Nr. 11, no. 10 (2011-05-26), S.4899-4914 |
| Datensatznummer |
250009763
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| Publikation (Nr.) |
 copernicus.org/acp-11-4899-2011.pdf |
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| Zusammenfassung |
| Sun-lit snow is increasingly recognized as a chemical reactor that
plays an active role in uptake, transformation, and release of atmospheric
trace gases. Snow is known to influence boundary layer air on a local scale,
and given the large global surface coverage of snow may also be significant
on regional and global scales. We present a new detailed one-dimensional snow
chemistry module that has been coupled to the 1-D atmospheric boundary layer
model MISTRA. The new 1-D snow module, which is dynamically coupled to the
overlaying atmospheric model, includes heat
transport in the snowpack, molecular diffusion, and wind pumping of gases in the interstitial air.
The model includes gas phase chemical reactions both in the interstitial air
and the atmosphere. Heterogeneous and multiphase chemistry on atmospheric
aerosol is considered explicitly. The chemical interaction of interstitial
air with snow grains is simulated assuming chemistry in a liquid-like layer
(LLL) on the grain surface. The coupled model, referred to as MISTRA-SNOW,
was used to investigate snow as the source of nitrogen oxides (NOx)
and gas phase reactive bromine in the atmospheric boundary layer in the
remote snow covered Arctic (over the Greenland ice sheet) as well as to
investigate the link between halogen cycling and ozone depletion that has
been observed in interstitial air. The model is validated using data taken
10 June–13 June, 2008 as part of the Greenland Summit Halogen-HOx
experiment (GSHOX). The model predicts that reactions involving bromide and
nitrate impurities in the surface snow can sustain atmospheric NO and BrO
mixing ratios measured at Summit, Greenland during this period. |
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