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To describe spatial and temporal characteristics of the activities of wintertime planetary waves in the northern hemisphere, their numbers and periods were precisely calculated, based on NCAR/NCEP reanalysis data. The objective variables include sea level pressure (SLP) and anomaly stream function at 850 hPa, 500 hPa and 200 hPa. 2D FFT and spectral analysis reveal that: (1) The wave numbers 1 and 2 dominate the perturbation pattern at 70°-80°N zonal belt. (2) The wave numbers 1, 2 and 3 dominate at 60°-70°N zonal belt. (3) The wave numbers 1-4 dominate at 50°-60°N zonal belt. The results accord fairly well with Rossby's classical trough formula and are of potential use for understanding the northern hemisphere large-scale oscillations.

Analysis on Spatio-temporal Characteristics of Wintertime Planetary Wave in the Northern Hemisphere Based on 2D FFT