# Retrieval of sodium number density profiles in the mesosphere and lower thermosphere from SCIAMACHY limb emission measurements

Langowski, M.P.; Von Savigny, C.; Burrows, J.P.; Rozanov, V.V.; Dunker, T.; Hoppe, U.-P.; Sinnhuber, M.; Aikin, A.C.

Abstract:
An 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 atomscm$^{-3}$. At middle to high latitudes a c ... mehr

 Zugehörige Institution(en) am KIT Fakultät für Physik (PHYSIK)Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF) Publikationstyp Zeitschriftenaufsatz Jahr 2016 Sprache Englisch Identifikator ISSN: 1867-1381, 1867-8548 urn:nbn:de:swb:90-596668 KITopen-ID: 1000059666 HGF-Programm 12.04.05 (POF III, LK 01) Erschienen in Atmospheric measurement techniques Band 9 Heft 1 Seiten 295-311 Nachgewiesen in Web of ScienceScopus
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