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| Titel |
Measured black carbon deposition on the Sierra Nevada snow pack and implication for snow pack retreat |
| VerfasserIn |
O. L. Hadley, C. E. Corrigan, T. W. Kirchstetter, S. S. Cliff, V. Ramanathan |
| 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 ; 10, no. 15 ; Nr. 10, no. 15 (2010-08-13), S.7505-7513 |
| Datensatznummer |
250008701
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| Publikation (Nr.) |
 copernicus.org/acp-10-7505-2010.pdf |
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| Zusammenfassung |
| Modeling studies show that the darkening of snow and ice by black carbon
deposition is a major factor for the rapid disappearance of arctic sea ice,
mountain glaciers and snow packs. This study provides one of the first
direct measurements for the efficient removal of black carbon from the
atmosphere by snow and its subsequent deposition to the snow packs of
California. The early melting of the snow packs in the Sierras is one of the
contributing factors to the severe water problems in California. BC
concentrations in falling snow were measured at two mountain locations and
in rain at a coastal site. All three stations reveal large BC concentrations
in precipitation, ranging from 1.7 ng/g to 12.9 ng/g. The BC concentrations
in the air after the snow fall were negligible suggesting an extremely
efficient removal of BC by snow. The data suggest that below cloud
scavenging, rather than ice nuclei, was the dominant source of BC in the
snow. A five-year comparison of BC, dust, and total fine aerosol mass
concentrations at multiple sites reveals that the measurements made at the
sampling sites were representative of large scale deposition in the Sierra
Nevada. The relative concentration of iron and calcium in the mountain
aerosol indicates that one-quarter to one-third of the BC may have been
transported from Asia. |
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