Mesopause temperature variations during strong sudden stratospheric warmings in 2008-2010

• Autores: I.V. Medvedeva, A.B. Beletsky, M.A. Chernigovskaya, V.I. Perminov, A.I. Semenov, A.V. Tatarnikov
• Localización: Óptica pura y aplicada, ISSN-e 2171-8814, Vol. 44, Nº. 4 (DIC), 2011 (Ejemplar dedicado a: 37th Amasom I), págs. 701-705
• Idioma: inglés
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• Resumen

  • We carried out joint analysis of the stratosphere and mesopause temperature variations during strong sudden stratospheric warming (SSW) events in 2008-2010. The data about the variations of the mesopause temperature (~87 km) obtained from ground-based spectrographic measurements of the hydroxyl emission (834.0 nm, band (6, 2)) at the ISTP Geophysical observatory (ISTP GPO) near Irkutsk (52ºN, 103ºE) and Zvenigorod station (56ºN, 37ºE) were used in this analysis. Satellite data on atmospheric temperature vertical profiles obtained by the EOS Aura Microwave Limb Sounder (MLS) were involved. We analyzed the strong SSWs which occurred in January-February 2008, January 2009 and January 2010 when stratospheric temperature disturbances of large spatial scales were observed. The satellite data on atmospheric temperature at the mesopause height showed a good agreement with those obtained from the ground-based measurements taken at both observatories. Temperature variations at the mesopause height were compared with those at stratospheric heights (31 and 46 km) during SSWs. We revealed that during all the analyzed SSWs the stratospheric temperature increase was accompanied by a temperature decrease in the mesopause. The time analysis of mesopause and stratospheric temperature variations revealed that the stratospheric temperature increased almost simultaneously - with a slight lead - with a mesopause temperature decrease. This study represents an experimental evidence of a dynamical coupling of the lower atmosphere and the mesopause after ground-based optical and satellite data.