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dc.contributor.author
Attinger, Roman
dc.contributor.author
Keller, Julia H.
dc.contributor.author
Köhler, Martin
dc.contributor.author
Riboldi, Jacopo
dc.contributor.author
Grams, Christian M.
dc.date.accessioned
2020-01-08T10:02:37Z
dc.date.available
2019-12-22T03:17:14Z
dc.date.available
2020-01-08T10:02:37Z
dc.date.issued
2019-12-02
dc.identifier.issn
0941-2948
dc.identifier.issn
1610-1227
dc.identifier.other
10.1127/metz/2019/0967
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/387051
dc.identifier.doi
10.3929/ethz-b-000387051
dc.description.abstract
The correct depiction of atmospheric blocking still poses a key challenge for current numerical weather prediction (NWP) and climate models. This study evaluates the representation of blocking in the new global ICOsahedral Non-hydrostatic NWP and climate model ICON and links model mean state biases to observed blocking deviations. Blocking is identified using both an anomaly and a flow reversal approach in an eight member ensemble of 15‑year AMIP-type ICON simulations and verified against ERA Interim reanalyses. Either approach demonstrates a good representation of annual blocking frequencies in ICON. Deviations emerge when considering individual seasons. In the anomaly framework, enhanced blocking occurrence in the mid-latitude Pacific domain during winter and spring and a marked underestimation of blocking in the Euro-Atlantic region are found during summer. Moreover, this approach indicates a general underestimation of blocking at higher latitudes. The flow reversal index reveals the often reported underestimation of blocking in the Euro-Atlantic region during winter. Furthermore, increased blocking activity in the Pacific and Greenland region during spring and decreased blocking occurrence at high latitudes in summer are found. Focusing on the anomaly approach, we assess how the model mean state influences blocking identification. A systematically higher tropopause, forced by a cold bias in the lower stratosphere, reduces diagnosed blocking frequencies at higher latitudes especially during summer. This goes along with a reduction in blocking size, duration, and intensity. While confirming an overall good representation of blocking in ICON, this study demonstrates how mean state biases can crucially affect the identification of blocking and that blocking deviations have to be interpreted with caution as they are highly dependent on the exact diagnostic used.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Borntraeger
en_US
dc.rights.uri
http://creativecommons.org/licenses/by-nc/4.0/
dc.subject
Atmospheric blocking
en_US
dc.subject
ICON
en_US
dc.subject
Blocking identif cation
en_US
dc.subject
Model evaluation
en_US
dc.subject
Northern Hemisphere
en_US
dc.title
Representation of atmospheric blocking in the new global non-hydrostatic weather prediction model ICON
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution-NonCommercial 4.0 International
dc.date.published
2019-08-15
ethz.journal.title
Meteorologische Zeitschrift
ethz.journal.volume
28
en_US
ethz.journal.issue
5
en_US
ethz.journal.abbreviated
Meteorol. Z.
ethz.pages.start
429
en_US
ethz.pages.end
446
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.grant
Diabatic processes in North Atlantic weather systems: synoptic and mesoscale dynamics
en_US
ethz.identifier.wos
ethz.publication.place
Berlin
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::03854 - Wernli, Johann Heinrich / Wernli, Johann Heinrich
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::03854 - Wernli, Johann Heinrich / Wernli, Johann Heinrich
ethz.grant.agreementno
165941
ethz.grant.fundername
SNF
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.program
Projekte MINT
ethz.date.deposited
2019-12-22T03:17:18Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2020-01-08T10:02:47Z
ethz.rosetta.lastUpdated
2022-03-29T00:32:20Z
ethz.rosetta.versionExported
true
ethz.COinS
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