Connections between the nonmigrating semidiurnal tide over the South Pole and stationary planetary waves in the northern hemisphere

Details Connections between the nonmigrating semidiurnal tide over the South Pole and stationary planetary waves in the northern hemisphere Connections between the nonmigrating semidiurnal tide over the South Pole and stationary planetary waves in the northern hemisphere

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa51a1914p&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA51A-1914

Physics

[3334] Atmospheric Processes / Middle Atmosphere Dynamics, [3389] Atmospheric Processes / Tides And Planetary Waves

Scientific paper

The westward propagating zonal wave-number one non-migrating semidiurnal tide is a dominant dynamical feature present during the Austral summer over the South Pole. It has been hypothesized that this wave is generated by a nonlinear interaction between the zonal wave-number one stationary planetary wave in the northern hemisphere stratosphere and the zonal wave-number two migrating diurnal tide. However, direct evidence of this interaction has yet to be observed. Using observations from the South Pole meteor radar system we have determined the unambiguous structure of the non-migrating semidiurnal tide in the meridional wind field. These observations are correlated with stationary planetary wave activity in the zonal and meridional wind fields in the northern hemisphere stratosphere. Data from the NASA MERRA global assimilative model are used to determine the structure of the zonal wave-number 1, 2, 3 and 4 stationary planetary waves for this comparison. Additionally temperature data from the NASA TIMED SABER mission are analyzed and compared to the MERRA temperature observations as validation of the model results. Preliminary correlation analysis has indicated no significant correlation with the zonal wave-number 1 stationary planetary wave but does show a clear correlation with the zonal wave-number 3 stationary wave. This correlation is unexpected and will be examined in more detail.

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