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dc.contributor.author
Funke, Bernd
dc.contributor.author
Ball, William
dc.contributor.author
Bender, Stefan
dc.contributor.author
Gardini, Angela
dc.contributor.author
Harvey, V. Lynn
dc.contributor.author
Lambert, Alyn
dc.contributor.author
López-Puertas, Manuel
dc.contributor.author
Marsh, Daniel R.
dc.contributor.author
Meraner, Katharina
dc.contributor.author
Nieder, Holger
dc.contributor.author
Päivärinta, Sanna-Mari
dc.contributor.author
Pérot, Kristell
dc.contributor.author
Randall, Cora E.
dc.contributor.author
Reddmann, Thomas
dc.contributor.author
Rozanov, Eugene
dc.contributor.author
Schmidt, Hauke
dc.contributor.author
Seppälä, Annika
dc.contributor.author
Sinnhuber, Miriam
dc.contributor.author
Sukhodolov, Timofei
dc.contributor.author
Stiller, Gabriele P.
dc.contributor.author
Tsvetkova, Natalia D.
dc.contributor.author
Verronen, Pekka T.
dc.contributor.author
Versick, Stefan
dc.contributor.author
von Clarmann, Thomas
dc.contributor.author
Walker, Kaley A.
dc.contributor.author
Yushkov, Vladimir
dc.date.accessioned
2017-10-24T15:27:05Z
dc.date.available
2017-10-06T03:42:48Z
dc.date.available
2017-10-24T15:27:05Z
dc.date.issued
2017-03
dc.identifier.issn
1680-7375
dc.identifier.issn
1680-7367
dc.identifier.other
10.5194/acp-17-3573-2017
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/191839
dc.identifier.doi
10.3929/ethz-b-000191839
dc.description.abstract
We compare simulations from three high-top (with upper lid above 120 km) and five medium-top (with upper lid around 80 km) atmospheric models with observations of odd nitrogen (NOx  =  NO + NO2), temperature, and carbon monoxide from seven satellite instruments (ACE-FTS on SciSat, GOMOS, MIPAS, and SCIAMACHY on Envisat, MLS on Aura, SABER on TIMED, and SMR on Odin) during the Northern Hemisphere (NH) polar winter 2008/2009. The models included in the comparison are the 3-D chemistry transport model 3dCTM, the ECHAM5/MESSy Atmospheric Chemistry (EMAC) model, FinROSE, the Hamburg Model of the Neutral and Ionized Atmosphere (HAMMONIA), the Karlsruhe Simulation Model of the Middle Atmosphere (KASIMA), the modelling tools for SOlar Climate Ozone Links studies (SOCOL and CAO-SOCOL), and the Whole Atmosphere Community Climate Model (WACCM4). The comparison focuses on the energetic particle precipitation (EPP) indirect effect, that is, the polar winter descent of NOx largely produced by EPP in the mesosphere and lower thermosphere. A particular emphasis is given to the impact of the sudden stratospheric warming (SSW) in January 2009 and the subsequent elevated stratopause (ES) event associated with enhanced descent of mesospheric air. The chemistry climate model simulations have been nudged toward reanalysis data in the troposphere and stratosphere while being unconstrained above. An odd nitrogen upper boundary condition obtained from MIPAS observations has further been applied to medium-top models. Most models provide a good representation of the mesospheric tracer descent in general, and the EPP indirect effect in particular, during the unperturbed (pre-SSW) period of the NH winter 2008/2009. The observed NOx descent into the lower mesosphere and stratosphere is generally reproduced within 20 %. Larger discrepancies of a few model simulations could be traced back either to the impact of the models' gravity wave drag scheme on the polar wintertime meridional circulation or to a combination of prescribed NOx mixing ratio at the uppermost model layer and low vertical resolution. In March–April, after the ES event, however, modelled mesospheric and stratospheric NOx distributions deviate significantly from the observations. The too-fast and early downward propagation of the NOx tongue, encountered in most simulations, coincides with a temperature high bias in the lower mesosphere (0.2–0.05 hPa), likely caused by an overestimation of descent velocities. In contrast, upper-mesospheric temperatures (at 0.05–0.001 hPa) are generally underestimated by the high-top models after the onset of the ES event, being indicative for too-slow descent and hence too-low NOx fluxes. As a consequence, the magnitude of the simulated NOx tongue is generally underestimated by these models. Descending NOx amounts simulated with medium-top models are on average closer to the observations but show a large spread of up to several hundred percent. This is primarily attributed to the different vertical model domains in which the NOx upper boundary condition is applied. In general, the intercomparison demonstrates the ability of state-of-the-art atmospheric models to reproduce the EPP indirect effect in dynamically and geomagnetically quiescent NH winter conditions. The encountered differences between observed and simulated NOx, CO, and temperature distributions during the perturbed phase of the 2009 NH winter, however, emphasize the need for model improvements in the dynamical representation of elevated stratopause events in order to allow for a better description of the EPP indirect effect under these particular conditions.
en_US
dc.language.iso
en
en_US
dc.publisher
Copernicus GmbH
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/3.0/
dc.title
HEPPA-II model-measurement intercomparison project: EPP indirect effects during the dynamically perturbed NH winter 2008-2009
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 3.0 Unported
ethz.journal.title
Atmospheric Chemistry and Physics
ethz.journal.volume
17
en_US
ethz.journal.issue
5
en_US
ethz.journal.abbreviated
Atmos. chem. phys.
ethz.pages.start
3573
en_US
ethz.pages.end
3604
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.grant
Future and Past Solar Influence on the Terrestrial Climate II
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Göttingen
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::03517 - Peter, Thomas / Peter, Thomas
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::03517 - Peter, Thomas / Peter, Thomas
ethz.grant.agreementno
147659
ethz.grant.fundername
SNF
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.program
SNF: Sonstige
ethz.relation.isNewVersionOf
20.500.11850/123931
ethz.date.deposited
2017-10-06T03:42:52Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-10-24T15:27:14Z
ethz.rosetta.lastUpdated
2018-11-05T23:10:45Z
ethz.rosetta.versionExported
true
ethz.COinS
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