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dc.contributor.authorLangowski, M.P.
dc.contributor.authorvon Savigny, C.
dc.contributor.authorBurrows, J.P.
dc.contributor.authorRozanov, V.V.
dc.contributor.authorDunker, Tim
dc.contributor.authorHoppe, Ulf-Peter
dc.contributor.authorSinnhuber, M
dc.contributor.authorAikin, A.C.
dc.date.accessioned2016-08-29T08:12:34Z
dc.date.available2016-08-29T08:12:34Z
dc.date.issued2016-01-28
dc.description.abstractAn algorithm has been developed for the retrieval of sodium atom (Na) number density on a latitude and altitude grid from SCIAMACHY (SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY) limb measurements of the Na resonance fluorescence. The results are obtained between 50 and 150 km altitude and the resulting global seasonal variations of Na are analyzed. The retrieval approach is adapted from that used for the retrieval of magnesium atom (Mg) and magnesium ion (Mg+) number density profiles recently reported by Langowski et al. (2014). Monthly mean values of Na are presented as a function of altitude and latitude. This data set was retrieved from the 4 years of spectroscopic limb data of the SCIAMACHY mesosphere and lower thermosphere (MLT) measurement mode (mid-2008 to early 2012). The Na layer has a nearly constant peak altitude of 90–93 km for all latitudes and seasons, and has a full width at half maximum of 5–15 km. Small but significant seasonal variations in Na are identified for latitudes less than 40°, where the maximum Na number densities are 3000–4000 atoms cm−3. At middle to high latitudes a clear seasonal variation with a winter maximum of up to 6000 atoms cm−3 is observed. The high latitudes, which are only measured in the summer hemisphere, have lower number densities, with peak densities being approximately 1000 Na atoms cm−3. The full width at half maximum of the peak varies strongly at high latitudes and is 5 km near the polar summer mesopause, while it exceeds 10 km at lower latitudes. In summer the Na atom concentration at high latitudes and at altitudes below 88 km is significantly smaller than that at middle latitudes. The results are compared with other observations and models and there is overall a good agreement with these.en_US
dc.description.sponsorshipThe AFOSR and the EOARD for the financial support of the project granted by grant no. FA8655-09-1-3012. SCIAMACHY is jointly funded by Germany, the Netherlands and Belgium. This work was in part supported by the University of Bremen and Ernst-Moritz-Arndt University of Greifswald. SCIAMACHY data were kindly provided by the European Space Agency (ESA). We would also like to thank ESA, as a part of the work was funded through the ESA MesosphEO project. Ulf-Peter Hoppe and Tim Dunker are grateful to the Research Council of Norway for funding the Na lidar measurements at ALOMAR through grants 208020/F50 and 216870/F50. For the maintenance and operation of the ALOMAR Na lidar we also wish to thank the National Science Foundation (NSF) for Financial support through grant NSF AGS-1136269.en_US
dc.descriptionPublisher's version, source: <a href=http://doi.org/10.5194/amt-9-295-2016>http://doi.org/10.5194/amt-9-295-2016</a>.en_US
dc.identifier.citationAtmospheric Measurement Techniques 2016, 9:295-311en_US
dc.identifier.cristinIDFRIDAID 1329662
dc.identifier.doi10.5194/amt-9-295-2016
dc.identifier.issn1867-1381
dc.identifier.urihttps://hdl.handle.net/10037/9572
dc.identifier.urnURN:NBN:no-uit_munin_9133
dc.language.isoengen_US
dc.publisherEuropean Geosciences Unionen_US
dc.rights.accessRightsopenAccess
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437en_US
dc.titleRetrieval of sodium number density profiles in the mesosphere and lower thermosphere from SCIAMACHY limb emission measurementsen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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