HEPPA-II model-measurement intercomparison project : EPP indirect effects during the dynamically perturbed NH winter 2008-2009

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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 Lopez-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 Perot, 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 2017-04-24T11:26:02Z
dc.date.available 2017-04-24T11:26:02Z
dc.date.issued 2017-03-14
dc.identifier.citation Funke , B , Ball , W , Bender , S , Gardini , A , Harvey , V L , Lambert , A , Lopez-Puertas , M , Marsh , D R , Meraner , K , Nieder , H , Päivärinta , S-M , Perot , K , Randall , C E , Reddmann , T , Rozanov , E , Schmidt , H , Seppälä , A , Sinnhuber , M , Sukhodolov , T , Stiller , G P , Tsvetkova , N D , Verronen , P T , Versick , S , von Clarmann , T , Walker , K A & Yushkov , V 2017 , ' HEPPA-II model-measurement intercomparison project : EPP indirect effects during the dynamically perturbed NH winter 2008-2009 ' , Atmospheric Chemistry and Physics , vol. 17 , no. 5 , pp. 3573-3604 . https://doi.org/10.5194/acp-17-3573-2017
dc.identifier.other PURE: 83260652
dc.identifier.other PURE UUID: 36d24725-38c5-4a7c-bfe3-81ffde95a091
dc.identifier.other WOS: 000397827900005
dc.identifier.other Scopus: 85015386479
dc.identifier.uri http://hdl.handle.net/10138/180941
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 D 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 (HAMMO-NIA), 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 NO x 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 mediumtop 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
dc.format.extent 32
dc.language.iso eng
dc.relation.ispartof Atmospheric Chemistry and Physics
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject OCTOBER-NOVEMBER 2003
dc.subject NITRIC-OXIDE
dc.subject ACE-FTS
dc.subject 114 Physical sciences
dc.title HEPPA-II model-measurement intercomparison project : EPP indirect effects during the dynamically perturbed NH winter 2008-2009 en
dc.type Article
dc.contributor.organization Department of Physics
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.5194/acp-17-3573-2017
dc.relation.issn 1680-7316
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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