A PRELIMINARY STUDY OF THE CHARACTERISTICS AND EVOLUTION OF THE MEAN MONTHLY CIRCULATION AT THE 500-MB LEVEL OVER THE NORTHERN HEMISPHERE, (II) ULTRA-LONG WAVES.
EMMANUEL COLL BOSTON MASS ORIENTAL SCIENCE LIBRARY
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The conclusions are as follows 1 There are pronounced seasonal patterns in the relative amplitudes of the first and third harmonics with a strong negative correlation between the two. The relative amplitudes of both the first and third harmonics at 55 degrees N are negatively correlated to their counter parts at 35 degrees N. No significant seasonal variation is indicated for the relative amplitude of the second harmonic. 2 The change of the phase angle shows a regular seasonal course at 55 degrees N except for the second harmonic. 3 The variation of the spectrum shows that the seasonal variation is different from year to year but the general trend is the same for all years. 4 The characteristics of the spectrum of transitional seasons are clearly distinct from those of summer and winter and therefore the natural synoptic seasons may be clearly defined. The beginning and ending as well as the length and character of the seasons vary from one year to another. 5 The weather anomaly in China has a close relationship with the pattern of ultra-long waves in the northern hemisphere. This may be shown by the examples of July 1954 and 1959 and February 1957 and 1960. Translator