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

P. J. Espy ; S. O. Fernandez ; Peter Forkman (Institutionen för rymd- och geovetenskap, Global miljömätteknik och modellering) ; Donal P. Murtagh (Institutionen för rymd- och geovetenskap, Global miljömätteknik och modellering) ; J. Stegman
Atmospheric Chemistry And Physics (1680-7316). Vol. 11 (2011), 2, p. 495-502.
[Artikel, refereegranskad vetenskaplig]

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 degrees 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.

Nyckelord: quasi-biennial oscillation, middle atmosphere, solar-activity, mesopause circulation, general-circulation, lower thermosphere, thermal, structure, semidiurnal tide, hydroxyl airglow, large-scale



Denna post skapades 2011-04-14. Senast ändrad 2015-07-10.
CPL Pubid: 139050

 

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