王绍武. 1964. 北半球500毫巴月平均环流特征及演变规律的研究——超长波[J]. 气象学报, 34(3):316-328, doi:10.11676/qxxb1964.033
北半球500毫巴月平均环流特征及演变规律的研究——超长波
A PRELIMINARY STUDY ON THE CHARACTERISTICS AND EVOLUTION OF MEAN MONTHLY CIRCULATION, Ⅱ ULTRA-LONG WAVES
投稿时间:1963-08-24  修订日期:1964-05-01
DOI:10.11676/qxxb1964.033
中文关键词:  
英文关键词:
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作者单位
王绍武 北京大学地球物理系 
摘要点击次数: 1664
全文下载次数: 1952
中文摘要:
      本文是作者研究近10年大气环流特征的第二部分。应用1951—1960年北半球500毫巴月平均图,用谐波分析方法计算了历年逐月55°N及35°N上波数1到4(第1到第4)波的振幅及位相角。由此分析了大气环流的季节变化。主要结果如下:1.第1波及第3波的振幅均有明显的年变程,但趋势彼此相反。另外,第1波或第3波振幅本身在55°N及35°N年变程也相反。第2波振幅年变程不明显。2.各波的位相角亦有明显而规则的年变程,只有55°N第2波的位相角季节变化不大。3.从逐年波谱及位相来看,大气环流的季节变化各年虽有不同,但季节的趋势却是每年都一致的。4.过渡季节的波谱与冬夏截然不同。因此一年可分为4个自然天气季节,但每年季节早晚、长短及特征均有一定差异。5.北半球超长波特征与我国天气有密切关系,这可以从一些例子来说明,如1954年7月与1959年7月,1957年2月与1960年2月。
英文摘要:
      This paper is the second report of a research project concerning the characteristics and evolution of the general circulation in recent ten years. The amplitude and the phase angle are calculated by means of 4-term harmonic analysis for the monthly mean 500 mb hight along the 55°N and 35°N lat.from 1951 to 1960. According to the spectral distribution and phase angle, the seasonal variation of the general circulation is discussed.The conclusions are the following:(1)There is a pronounced seasonal course in the change of amplitudes of first and third harmonic.But this seasonal trend of the first and third harmonic at same latitude is opposite.The seasonal trend of the first or third harmonic at 55°N and 35°N lat. is also opposite. No clearly seasonal variation is revealed for the second harmonic. (2)The change of phase angle shows a regular seasonal course except for second harmonic at 55°N lat.(3) The variation of spectrum from 1951 to 1960 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, therefore the natural synoptic seasons may be clearly defined. The begining 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 connection with the pattern of ultra-long waves in northern hemisphere. This may be shown by examples of July 1954 and 1959, as well as February 1957 and 1960.
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