Does sudden stratospheric warming induce meridional circulation in the mesosphere thermosphere system?

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dc.contributor.author Laskar, Fazlul I.
dc.contributor.author Pallamraju, Duggirala
dc.date.accessioned 2014-12-31T11:11:42Z
dc.date.available 2014-12-31T11:11:42Z
dc.date.issued 2014-12
dc.identifier.citation Laskar, Fazlul I. and Pallamraju, Duggirala, “Does sudden stratospheric warming induce meridional circulation in the mesosphere thermosphere system?”, Journal of Geophysical Research: Space Physics, DOI: 10.1002/2014JA020086, Dec. 2014. en_US
dc.identifier.issn 2169-9402
dc.identifier.uri http://dx.doi.org/10.1002/2014JA020086
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/1518
dc.description.abstract Oxygen dayglow emissions at multiple wavelengths that emanate from different heights (from around 130 km to peak altitude of the ionospheric F region) over a low-latitude location showed systematic enhancements in intensities throughout the daytime hours during four sudden stratospheric warming (SSW) events that occurred in the years 2010–2013. The lower thermospheric temperatures at 120 km obtained from the Sounding of the Atmosphere using Broadband Emission Radiometry instrument are found to be enhanced during SSW events at arctic latitudes and show a gradient with a decrease toward low-latitudes. During these events, the Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics Doppler Interferometer measurements showed equatorward winds in the mesosphere lower thermosphere (MLT) altitudes over high-latitudes. Both the high-latitude lower thermospheric temperature enhancements and the MLT region equatorward winds occur nearly simultaneously with the observed enhancements in the atomic oxygen dayglow emission intensities at all the wavelengths over low-latitudes. Based on these measurements and other supporting information, it is proposed that a new cell of meridional circulation in the MLT winds is set up during SSW events, which enables transport of atomic oxygen from high-to-low latitudes. Such an additional contribution of oxygen density over low-latitudes interacts with lower thermospheric daytime dynamics in that region and is attributed to be the cause for the observed enhancement in the oxygen daytime optical emission intensities over low-latitudes. The results presented here provide experimental evidence to such circulation alluded to by earlier simulation studies. en_US
dc.description.statementofresponsibility by Fazlul I. Laskar and Duggirala Pallamraju
dc.format.extent vol. 119, no. 12, pp. 10133-10143
dc.language.iso en en_US
dc.publisher Wiley en_US
dc.subject Airglow en_US
dc.subject Atmospheric dynamics en_US
dc.subject Atmospheric coupling en_US
dc.subject Dayglow en_US
dc.subject Sudden stratospheric warming en_US
dc.subject Thermospheric circulation en_US
dc.title Does sudden stratospheric warming induce meridional circulation in the mesosphere thermosphere system? en_US
dc.type Article en_US
dc.relation.journal Journal of Geophysical Research: Space Physics


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