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dc.contributor.author
Croft, Betty
dc.contributor.author
Lohmann, Ulrike
dc.contributor.author
Martin, Randall V.
dc.contributor.author
Stier, Philip
dc.contributor.author
Wurzler, Sabine
dc.contributor.author
Feichter, Johann
dc.contributor.author
Posselt, Rebekka
dc.contributor.author
Ferrachat, Sylvaine
dc.date.accessioned
2018-10-02T12:24:31Z
dc.date.available
2017-06-14T11:36:59Z
dc.date.available
2018-10-02T12:24:31Z
dc.date.issued
2009
dc.identifier.issn
1680-7375
dc.identifier.issn
1680-7367
dc.identifier.other
10.5194/acp-9-4653-2009
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/157038
dc.identifier.doi
10.3929/ethz-b-000157038
dc.description.abstract
Wet deposition processes are highly efficient in the removal of aerosols from the atmosphere, and thus strongly influence global aerosol concentrations, and clouds, and their respective radiative forcings. In this study, physically detailed size-dependent below-cloud scavenging parameterizations for rain and snow are implemented in the ECHAM5-HAM global aerosol-climate model. Previously, below-cloud scavenging by rain in the ECHAM5-HAM was simply a function of the aerosol mode, and then scaled by the rainfall rate. The below-cloud scavenging by snow was a function of the snowfall rate alone. The global mean aerosol optical depth, and sea salt burden are sensitive to the below-cloud scavenging coefficients, with reductions near to 15% when the more vigorous size-dependent below-cloud scavenging by rain and snow is implemented. The inclusion of a prognostic rain scheme significantly reduces the fractional importance of below-cloud scavenging since there is higher evaporation in the lower troposphere, increasing the global mean sea salt burden by almost 15%. Thermophoretic effects are shown to produce increases in the global and annual mean number removal of Aitken size particles of near to 10%, but very small increases (near 1%) in the global mean below-cloud mass scavenging of carbonaceous and sulfate aerosols. Changes in the assumptions about the below-cloud scavenging by rain of particles with radius smaller than 10 nm do not cause any significant changes to the global and annual mean aerosol mass or number burdens, despite a change in the below-cloud number removal rate for nucleation mode particles by near to five-fold. Annual and zonal mean nucleation mode number concentrations are enhanced by up to 30% in the lower troposphere with the more vigourous size-dependent below-cloud scavenging. Closer agreement with different observations is found when the more physically detailed below-cloud scavenging parameterization is employed in the ECHAM5-HAM model.
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
Aerosol size-dependent below-cloud scavenging by rain and snow in the ECHAM5-HAM
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 3.0 Unported
dc.date.published
2009-07-17
ethz.journal.title
Atmospheric Chemistry and Physics
ethz.journal.volume
9
en_US
ethz.journal.issue
14
en_US
ethz.journal.abbreviated
Atmos. chem. phys.
ethz.pages.start
4653
en_US
ethz.pages.end
4675
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
2017-06-14T11:41:35Z
ethz.source
ECIT
ethz.identifier.importid
imp59364cdfba0a753862
ethz.ecitpid
pub:35310
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-12T23:09:58Z
ethz.rosetta.lastUpdated
2018-10-02T12:24:36Z
ethz.rosetta.versionExported
true
ethz.COinS
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