SA41B-2338
Observations of Secondary Waves Generated from Interaction Between the 2-Day Wave and the Migrating Diurnal Tide.

Thursday, 17 December 2015
Poster Hall (Moscone South)
Ruth Segal Lieberman1, Dennis M Riggin1, David E Siskind2, Vu Nguyen3, Scott E Palo4 and Nicholas J Mitchell5, (1)GATS-Inc., Boulder, CO, United States, (2)Naval Research Lab, Washington, DC, United States, (3)University of Colorado at Boulder, Colorado Springs, CO, United States, (4)University of Colorado at Boulder, Boulder, CO, United States, (5)University of Bath, Bath, United Kingdom
Abstract:
Nonlinear coupling between the migrating diurnal tide and the westward
traveling quasi-2-day wave yields a westward-traveling "sum" wave
with zonal wavenumber 4 and a period of 16 hours, and an eastward-traveling
"difference" wave with a zonal wavenumber 2 and a period of 2 days.
While the eastward 2-day wave has been reported in TIMED/SABER temperatures,
the westward 16-hour wave lies outside SABER's Nyquist limits of
resolution. To obtain simultaneous definitions of the parent
and child waves, we examine hourly output from NOGAPS-ALPHA during
January 2005, 2006 and 2008. The westward 16-hour wave maximizes
in the winter hemisphere, and behaves like an inertia-gravity wave.
The eastward 2-day wave maximizes at low latitudes, and exhibits a
mixture of Kelvin and higher-order modes. The 16-hour and the
eastward 2-day waves are of comparable magnitude, and alias to
the same apparent frequency when viewed from the satellite
  perspective.
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