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URN: urn:nbn:de:swb:90-586130

Global investigation of the Mg atom and ion layers using SCIAMACHY/Envisat observations between 70 and 150 km altitude and WACCM-Mg model results

Langowski, M.P.; Von Savigny, C.; Burrows, J.P.; Feng, W.; Plane, J.M.C.; Marsh, D.R.; Janches, D.; Sinnhuber, M.; Aikin, A.C.; Liebing, P.

Abstract:
Mg and Mg$^{+}$ concentration fields in the upper mesosphere/lower thermosphere (UMLT) region are retrieved from SCIAMACHY/Envisat limb measurements of Mg and Mg$^{+}$ dayglow emissions using a 2-D tomographic retrieval approach. The time series of monthly mean Mg and Mg$^{+}$ number density and vertical column density in different latitudinal regions are presented. Data from the limb mesosphere–thermosphere mode of SCIAMACHY/Envisat are used, which cover the 50 to 150 km altitude region with a vertical sampling of ≈ 3.3 km and latitudes up to 82°. The high latitudes are not observed in the winter months, because there is no dayglow emission during polar night. The measurements were performed every 14 days from mid-2008 until April 2012. Mg profiles show a peak at around 90 km altitude with a density between 750 cm$^{-3}$ and 1500 cm$^{-3}$. Mg does not show strong seasonal variation at latitudes below 40°. For higher latitudes the density is lower and only in the Northern Hemisphere a seasonal cycle with a summer minimum is observed. The Mg$^{+}$ peak occurs 5–15 km above the neutral Mg peak altitude. These ions have a significant ... mehr


Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 1680-7316, 1680-7324
KITopen ID: 1000058613
HGF-Programm 12.04.05; LK 01
Erschienen in Atmospheric chemistry and physics
Band 15
Heft 1
Seiten 273-295
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