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| Titel |
Simulation of black carbon in snow and its climate impact in the Canadian Global Climate Model |
| VerfasserIn |
M. Namazi, K. Salzen, J. N. S. Cole |
| 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 ; 15, no. 18 ; Nr. 15, no. 18 (2015-09-30), S.10887-10904 |
| Datensatznummer |
250120066
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| Publikation (Nr.) |
 copernicus.org/acp-15-10887-2015.pdf |
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| Zusammenfassung |
| A new physically based parameterisation of black carbon (BC) in snow was
developed and implemented in the Canadian Atmospheric Global Climate Model
(CanAM4.2). Simulated BC snow mixing ratios and BC snow radiative forcings
are in good agreement with measurements and results from other models.
Simulations with the improved model yield considerable trends in regional BC
concentrations in snow and BC snow radiative forcings during the time period
from 1950–1959 to 2000–2009. Increases in radiative forcings for Asia
and decreases for Europe and North America are found to be associated with
changes in BC emissions. Additional sensitivity simulations were performed in
order to study the impact of BC emission changes between 1950–1959 and
2000–2009 on surface albedo, snow cover fraction, and surface air
temperature. Results from these simulations indicate that impacts of BC
emission changes on snow albedos between these 2 decades are small and not
significant. Overall, changes in BC concentrations in snow have much smaller
impacts on the cryosphere than the net warming surface air temperatures
during the second half of the 20th century. |
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