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dc.contributor.author
Kerbrat, M.
dc.contributor.author
Pinzer, Bernd
dc.contributor.author
Huthwelker, Thomas
dc.contributor.author
Gäggeler, Heinz W.
dc.contributor.author
Ammann, Markus
dc.contributor.author
Schneebeli, Martin
dc.date.accessioned
2018-10-30T11:46:20Z
dc.date.available
2017-06-11T19:42:27Z
dc.date.available
2018-10-30T11:46:20Z
dc.date.issued
2008
dc.identifier.issn
1680-7375
dc.identifier.issn
1680-7367
dc.identifier.other
10.5194/acp-8-1261-2008
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/104936
dc.identifier.doi
10.3929/ethz-b-000104936
dc.description.abstract
Chemical and physical processes, such as heterogeneous chemical reactions, light scattering, and metamorphism occur in the natural snowpack. To model these processes in the snowpack, the specific surface area (SSA) is a key parameter. In this study, two methods, computed tomography and methane adsorption, which have intrinsically different effective resolutions – molecular and 30 μm, respectively – were used to determine the SSA of similar natural snow samples. Except for very fresh snow, the two methods give identical results, with an uncertainty of 3%. This implies that the surface of aged natural snow is smooth up to a scale of about 30 μm and that if smaller structures are present they do not contribute significantly to the overall SSA. It furthermore implies that for optical methods a voxel size of 10 μm is sufficient to capture all structural features of this type of snow; however, fresh precipitation appears to contain small features that cause an under-estimation of SSA with tomography at this resolution. The methane adsorption method is therefore superior to computed tomography for very fresh snow having high SSA. Nonetheless, in addition to SSA determination, tomography provides full geometric information about the ice matrix. It can also be advantageously used to investigate layered snow packs, as it allows measuring SSA in layers of less than 1 mm.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Copernicus
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/3.0/
dc.title
Measuring the specific surface area of snow with X-ray tomography and gas adsorption: comparison and implications for surface smoothness
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 3.0 Unported
dc.date.published
2008-03-04
ethz.journal.title
Atmospheric Chemistry and Physics
ethz.journal.volume
8
en_US
ethz.journal.issue
5
en_US
ethz.journal.abbreviated
Atmos. chem. phys.
ethz.pages.start
1261
en_US
ethz.pages.end
1275
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.nebis
004294181
ethz.publication.place
Göttingen
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2017-06-11T19:42:42Z
ethz.source
ECIT
ethz.identifier.importid
imp5936538831a5b68773
ethz.ecitpid
pub:164224
ethz.eth
no
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-13T15:49:03Z
ethz.rosetta.lastUpdated
2018-10-30T11:46:34Z
ethz.rosetta.versionExported
true
ethz.COinS
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