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| Titel |
The effect of snow/sea ice type on the response of albedo and light penetration depth (e-folding depth) to increasing black carbon |
| VerfasserIn |
A. A. Marks, M. D. King |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 8, no. 5 ; Nr. 8, no. 5 (2014-09-03), S.1625-1638 |
| Datensatznummer |
250116308
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| Publikation (Nr.) |
 copernicus.org/tc-8-1625-2014.pdf |
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| Zusammenfassung |
| The optical properties of snow/sea ice vary with age and by the
processes they were formed, giving characteristic types of snow and
sea ice. The response of albedo and light penetration depth
(e-folding depth) to increasing mass ratio of black carbon is shown to
depend on the snow and sea ice type and the thickness of the snow or
sea ice. The response of albedo and e-folding depth of three
different types of snow (cold polar snow, wind-packed snow and
melting snow) and three sea ice (multi-year ice, first-year ice and
melting sea ice) to increasing mass ratio of black carbon is calculated using
a coupled atmosphere–snow/sea ice radiative-transfer model
(TUV-snow), over the optical wavelengths of 300–800 nm.
The snow and sea ice types are effectively defined by a scattering
cross-section, density and asymmetry parameter. The relative change in albedo
and e-folding depth of each of the three snow and three sea ice types
with increasing mass ratio of black carbon is considered relative to a base
case of 1 ng g−1 of black carbon. The relative response of each snow and
sea ice type is intercompared to examine how different types of snow and sea
ice respond relative to each other. The relative change in albedo of a melting
snowpack is a factor of four more responsive to
additions of black carbon compared to cold polar snow over a black
carbon increase from 1 to 50 ng g−1, while the relative
change in albedo of a melting sea ice is a factor of two more
responsive to additions of black carbon compared to multi-year ice
for the same increase in mass ratio of black carbon. The response of
e-folding depth is effectively not dependent on snow/sea ice type. The
albedo of sea ice is more responsive to increasing mass ratios of
black carbon than snow. |
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