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High-Frequency Planetary Waves in the Polar Middle Atmosphere as seen in a data Assimilation SystemThis study examines the winter southern hemisphere vortex of 1998 using four times daily output from a data assimilation system to focus on the polar 2-day, wave number 2 component of the 4-day wave. The data assimilation system products are from a test version of the finite volume data assimilation system (fvDAS) being developed at Goddard Space Flight Center (GSFC) and include an ozone assimilation system. Results show that the polar 2-day wave dominates during July 1998 at 70 degrees. The period of the quasi 2-day wave is somewhat shorter than 2 days (about 1.7 days) during July 1998 with an average perturbation temperature amplitude for the month of over 2.5 K. The 2-day wave propagates more slowly than the zonal mean zonal wind, consistent with Rossby wave theory, and has EP flux divergence regions associated with regions of negative horizontal potential vorticity gradients, as expected from linear instability theory. Results for the assimilation-produced ozone mixing ratio show that the 2-day wave represents a major source of ozone variation in this region. The ozone wave in the assimilation system is in good agreement with the wave seen in the POAM (Polar Ozone and Aerosol Measurement) ozone observations for the same time period. Some differences with linear instability theory are noted as well as spectral peaks in the ozone field, not seen in the temperature field, that may be a consequence of advection.
Document ID
20030025379
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Coy, L. (Naval Research Lab. Washington, DC, United States)
Stajner, I. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
DaSilva, A. M. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Joiner, J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Rood, R. B. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Pawson, S. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Lin, S. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2003
Subject Category
Geophysics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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