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The role of the QBO in the inter-hemispheric coupling of summer mesospheric temperatures

Espy, Patrick Joseph; Ochoa, Sara; Forkman, Peter; Murtagh, Donal; Stegman, Jacek
Journal article, Peer reviewed
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acpd-10-23403-2010.pdf (625.5Kb)
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http://hdl.handle.net/11250/2360227
Utgivelsesdato
2010
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Originalversjon
Atmospheric Chemistry and Physics Discussions 2010, 10(10):23403-23422   10.5194/acpd-10-23403-2010
Sammendrag
Inter-hemispheric coupling between the polar summer mesosphere and planetary-wave activity in the extra-tropical winter stratosphere has recently been inferred using Polar Mesospheric Cloud (PMC) properties as a proxy for mesospheric temperature (Karlsson et al., 2007). Here we confirm these results using a ten-year time series of July mesospheric temperatures near 60° N derived from the hydroxyl (OH) nightglow. In addition, we show that the time/lagged correlation between these summer mesospheric temperatures and the ECMWF winter stratospheric temperatures displays a strong Quasi-Biennial Oscillation (QBO). The sign and phase of the correlation is consistent with the QBO modulation of the extra-tropical stratospheric dynamics in the Southern Hemisphere via the Holton-Tan mechanism (Holton and Tan, 1980). This lends strength to the identification of synoptic and planetary waves as the driver of the inter-hemispheric coupling, and results in a strong QBO modulation of the polar summer mesospheric temperatures.
Utgiver
European Geosciences Union
Tidsskrift
Atmospheric Chemistry and Physics Discussions

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