Asymmetry in the interhemispheric planetary wave-tide link between the two hemispheres

Xinwen, Xu; Manson, A. H.; Meek, C. E.; Chshyolkova, T.; Drummond, J. R.; Riggin, D. M.; Hall, Chris M.; Hibbins, R. E.; Tsutsumi, Masaki

doi:10.1016/j.jastp.2009.07.011

Cited by 6 publications

(1 citation statement)

References 25 publications

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“…The CMAM‐DAS (not shown) does not provide a clear correlation between variability of the Antarctic winter SPW1 amplitude and the Arctic summer SW1 amplitude. This again agrees with the claims of Xu et al [2009a, 2009b], indicating the existence of asymmetry in the interhemispheric SPW‐tidal coupling between two hemispheres. Note that the examination of the correlation between the tidal and PW fields provides only indirect evidence of the possible mechanism because the CMAM‐DAS involves complicated nonlinear feedbacks.…”

Section: Comparison Of Variability Of the Antarctic Sw1 With The Arctsupporting

confidence: 91%

Mesospheric wind semidiurnal tides within the Canadian Middle Atmosphere Model Data Assimilation System

et al. 2011

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The horizontal wind data from the standard version of Canadian Middle Atmosphere Model Data Assimilation System (CMAM‐DAS) for the years 2006–2008 are analyzed to obtain the global structure and seasonal variability of the semidiurnal tide (SDT) in the mesosphere. The modeled amplitudes and phases of the SDTs at single stations from middle/high northern latitudes are quite similar to those observed by radars. The primary nonmigrating tides identified in both the meridional wind and zonal wind semidiurnal spectra at 88 km include the westward propagating wave numbers s = 1 (SW1), 3 (SW3), 4 (SW4), 6 (SW6), the standing s = 0 (S0), and the eastward propagating s = 2 (SE2). The migrating SDT (SW2) amplitude maxima usually occur at 40°N–60°N during December–February and August–September, and also at 40°S–60°S in April–May, with the dominance of (2, 4) during October–April and (2, 3) and (2, 5) dominance for other months. The CMAM‐DAS is quite successful in reproducing the dominance of SW1 in the Antarctic summer mesosphere. The modeled SW1 shows very good overall agreement in both amplitude and phase with wind measurements from UARS High Resolution Doppler Imager and Wind Imaging Interferometer (UARS‐HRDI/WINDII) and from TIMED Doppler Interferometer (TIDI). The CMAM‐DAS analyses for SW3, SW4, SW6, and S0 are also in reasonable agreement with those determined from the HRDI/WINDII or TIDI wind measurements. This work provides further evidence for the tidal forcing from below.

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Section: Comparison Of Variability Of the Antarctic Sw1 With The Arctsupporting

confidence: 91%

Mesospheric wind semidiurnal tides within the Canadian Middle Atmosphere Model Data Assimilation System

et al. 2011

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Global Dynamics of the MLT

2012

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The transition between the middle atmosphere and the thermosphere is known as the MLT region (for mesosphere and lower thermosphere). This area has some characteristics that set it apart from other regions of the atmosphere. Most notably, it is the altitude region with the lowest overall temperature and has the unique characteristic that the temperature is much lower in summer than in winter. The summer-to-winter-temperature gradient is the result of adiabatic cooling and warming associated with a vigorous circulation driven primarily by gravity waves. Tides and planetary waves also contribute to the circulation and to the large dynamical variability in the MLT. The past decade has seen much progress in describing and understanding the dynamics of the MLT and the interactions of dynamics with chemistry and radiation. This review describes recent observations and numerical modeling as they relate to understanding the dynamical processes that control the MLT and its variability. Results from the Whole Atmosphere Community Climate Model (WACCM), which is a comprehensive high-top general circulation model with interactive chemistry, are used to illustrate the dynamical processes. Selected observations from the Sounding the Atmosphere with Broadband Emission Radiometry (SABER) instrument are shown for comparison. WACCM simulations of MLT dynamics have some differences with observations. These differences and other questions and discrepancies described in recent papers point to a number of ongoing uncertainties about the MLT dynamical system.

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Interannual variability of the S=1 and S=2 components of the semidiurnal tide in the Antarctic MLT

Hibbins

Marsh

McDonald

et al. 2010

Journal of Atmospheric and Solar-Terrestrial Physics

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Asymmetry in the interhemispheric planetary wave-tide link between the two hemispheres

Cited by 6 publications

References 25 publications

Mesospheric wind semidiurnal tides within the Canadian Middle Atmosphere Model Data Assimilation System

Mesospheric wind semidiurnal tides within the Canadian Middle Atmosphere Model Data Assimilation System

Global Dynamics of the MLT

Interannual variability of the S=1 and S=2 components of the semidiurnal tide in the Antarctic MLT

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