Show simple item record

dc.contributor.author
Joos, Hanna
dc.contributor.author
Spichtinger, Peter
dc.contributor.author
Lohmann, Ulrike
dc.date.accessioned
2018-10-08T09:14:12Z
dc.date.available
2017-06-14T11:38:10Z
dc.date.available
2018-10-08T08:48:28Z
dc.date.available
2018-10-08T09:14:12Z
dc.date.issued
2009
dc.identifier.issn
1680-7375
dc.identifier.issn
1680-7367
dc.identifier.other
10.5194/acp-9-7825-2009
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/157048
dc.identifier.doi
10.3929/ethz-b-000157048
dc.description.abstract
A cloud resolving model (CRM) is used to investigate the formation of orographic cirrus clouds in the current and future climate. The formation of cirrus clouds depends on a variety of dynamical and thermodynamical processes, which act on different scales. First, the capability of the CRM in realistically simulating orographic cirrus clouds has been tested by comparing the simulated results to aircraft measurements of an orographic cirrus cloud. The influence of a warmer climate on the microphysical and optical properties of cirrus clouds has been investigated by initializing the CRM with vertical profiles of horizontal wind, potential temperature and equivalent potential temperature, respectively. The vertical profiles are extracted from IPCC A1B simulations for the current climate and for the period 2090–2099 for two regions representative for North and South America. The influence of additional moisture in a future climate on the propagation of gravity waves and the formation of orographic cirrus could be estimated. In a future climate, the increase in moisture dampens the vertical propagation of gravity waves and the occurring vertical velocities in the moist simulations. Together with higher temperatures fewer ice crystals nucleate homogeneously. Assuming that the relative humidity does not change in a warmer climate the specific humidity in the model is increased. This increase in specific humidity in a warmer climate results in a higher ice water content. The net effect of a reduced ice crystal number concentration and a higher ice water content is an increased optical depth. However, in some moist simulations dynamical changes contribute to changes in the ice water content, ice crystal number concentration and optical depth. For the corresponding dry simulations dynamical changes are more pronounced leading to a decreased optical depth in a future climate in some cases.
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
Orographic cirrus in a future climate
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 3.0 Unported
dc.date.published
2009-10-20
ethz.journal.title
Atmospheric Chemistry and Physics
ethz.journal.volume
9
en_US
ethz.journal.issue
20
en_US
ethz.journal.abbreviated
Atmos. chem. phys.
ethz.pages.start
7825
en_US
ethz.pages.end
7845
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
imp59364cdfeeeb218771
ethz.ecitpid
pub:35320
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-12T22:48:47Z
ethz.rosetta.lastUpdated
2018-10-08T09:14:19Z
ethz.rosetta.versionExported
true
ethz.COinS
ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.atitle=Orographic%20cirrus%20in%20a%20future%20climate&rft.jtitle=Atmospheric%20Chemistry%20and%20Physics&rft.date=2009&rft.volume=9&rft.issue=20&rft.spage=7825&rft.epage=7845&rft.issn=1680-7375&1680-7367&rft.au=Joos,%20Hanna&Spichtinger,%20Peter&Lohmann,%20Ulrike&rft.genre=article&
 Search via SFX

Files in this item

Thumbnail

Publication type

Show simple item record