An Observational Study of Large-Scale Atmospheric Rossby Waves during FGGE

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  • 1 Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139
  • | 2 Goddard Laboratory for Atmospheric Sciences, Global Modeling and Simulation Branch, NASA/Goddard Space Flight Center, Greenbelt, MD 20771
  • | 3 M/A-COM Sigma Data Incorporated, Global Modeling and Simulation Branch, NASA/Goddard Space Flight Center, Greenbelt, MD 20771
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Abstract

Analyzed global data from the European Centre for Medium Range Weather Forecasts for the FGGE year are projected onto Hough functions at each synoptic time and the time series filtered to retain all westward propagating components on time scales less than seasonal. The evolution of Hough mode phase agrees closely with Rossby wave theory whenever the amplitudes are not small. The evolution of the wave amplitude is described as irregular vacillation. The first three zonal and meridional wavenumbers are studied. The total Rossby wave field can be as large as 130 m and can potentially explain a significant part of observed, persistent anomalies.

Abstract

Analyzed global data from the European Centre for Medium Range Weather Forecasts for the FGGE year are projected onto Hough functions at each synoptic time and the time series filtered to retain all westward propagating components on time scales less than seasonal. The evolution of Hough mode phase agrees closely with Rossby wave theory whenever the amplitudes are not small. The evolution of the wave amplitude is described as irregular vacillation. The first three zonal and meridional wavenumbers are studied. The total Rossby wave field can be as large as 130 m and can potentially explain a significant part of observed, persistent anomalies.

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