Show simple item record

dc.contributor.author
Glassmeier, Franziska
dc.contributor.author
Arnold, L.
dc.contributor.author
Dietlicher, Remo
dc.contributor.author
Paukert, Marco
dc.contributor.author
Lohmann, Ulrike
dc.date.accessioned
2019-05-28T14:19:05Z
dc.date.available
2018-12-18T04:13:19Z
dc.date.available
2018-12-18T15:15:22Z
dc.date.available
2019-05-28T14:19:05Z
dc.date.issued
2018-11-16
dc.identifier.issn
0148-0227
dc.identifier.issn
2169-897X
dc.identifier.other
10.1029/2018JD028356
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/311459
dc.identifier.doi
10.3929/ethz-b-000311459
dc.description.abstract
Collisional charge transfer between graupel and ice crystals in the presence of cloud droplets is considered the dominant mechanism for charge separation in thunderclouds. According to the relative diffusional growth rate (RDGR) theory, the hydrometeor with the faster diffusional radius growth is charged positively in such collisions. We explore sensitivities of the RDGR theory to nonspherical hydrometeors and six parameters (pressure, temperature, liquid water content, sizes of ice crystals, graupel, and cloud droplets). Idealized simulations of a thundercloud with two‐moment cloud microphysics provide a realistic sampling of the parameter space. Nonsphericity and anisotropic diffusional growth strongly control the extent of positive graupel charging. We suggest a tuning parameter to account for anisotropic effects not represented in bulk microphysics schemes. In a susceptibility analysis that uses automated differentiation, we identify ice crystal size as most important RDGR parameter, followed by graupel size. Simulated average ice crystal size varies with temperature due to ice multiplication and heterogeneous freezing of droplets. Cloud microphysics and ice crystal size thus indirectly determine the structure of charge reversal lines in the traditional temperature‐water‐content representation. Accounting for the variability of ice crystal size and potentially habit with temperature may help to explain laboratory results and seems crucial for RDGR parameterizations in numerical models. We find that the contribution of local water vapor from evaporating rime droplets to diffusional graupel growth is only important for high effective water content. In this regime, droplet size and pressure are the dominant RDGR parameters. Otherwise, the effect of local graupel growth is masked by small ice crystal sizes that result from ice multiplication.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Wiley
en_US
dc.rights.uri
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.title
A Modeling Study on the Sensitivities of Atmospheric Charge Separation According to the Relative Diffusional Growth Rate Theory to Nonspherical Hydrometeors and Cloud Microphysics
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
dc.date.published
2018-09-22
ethz.journal.title
Journal of Geophysical Research. Atmospheres
ethz.journal.volume
123
en_US
ethz.journal.issue
21
en_US
ethz.journal.abbreviated
J. geophys. res., Atmos.
ethz.pages.start
12236
en_US
ethz.pages.end
12252
en_US
ethz.size
17 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Hoboken, NJ
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02717 - Institut für Atmosphäre und Klima / Inst. Atmospheric and Climate Science::03690 - Lohmann, Ulrike / Lohmann, Ulrike
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02717 - Institut für Atmosphäre und Klima / Inst. Atmospheric and Climate Science::03690 - Lohmann, Ulrike / Lohmann, Ulrike
ethz.relation.isSupplementedBy
10.3929/ethz-b-000268687
ethz.date.deposited
2018-12-18T04:13:20Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2018-12-18T15:15:39Z
ethz.rosetta.lastUpdated
2019-05-28T14:19:25Z
ethz.rosetta.exportRequired
false
ethz.rosetta.versionExported
true
ethz.COinS
ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.atitle=A%20Modeling%20Study%20on%20the%20Sensitivities%20of%20Atmospheric%20Charge%20Separation%20According%20to%20the%20Relative%20Diffusional%20Growth%20Rate%20Theory%20to%20&rft.jtitle=Journal%20of%20Geophysical%20Research.%20Atmospheres&rft.date=2018-11-16&rft.volume=123&rft.issue=21&rft.spage=12236&rft.epage=12252&rft.issn=0148-0227&2169-897X&rft.au=Glassmeier,%20Franziska&Arnold,%20L.&Dietlicher,%20Remo&Paukert,%20Marco&Lohmann,%20Ulrike&rft.genre=article&
 Search via SFX

Files in this item

Thumbnail

Publication type

Show simple item record