摘要
本文分析了青藏高原冷暖年中大气超长波和东亚至西太平洋地区副热带纬圈环流的变化,认为冷年和暖年中大气超长波和东亚副热带纬圈环流状况的不同,可能是影响汛期长江流域大范围持续性旱涝变化的原因之一。
This paper describes overall the correlation analysis of the air temperature at eight basic stations in the East Qinghai-xizang Plateau and the precipitation in water season on Yangtze River basin.It is found in the chart that there is an obvious maximun value of monthly mean air temperature in the plateau in March,August and December last year.The appearance of three high correlation stages is not occasional. The variation from month to month shows that three stages are also with higher continuity.This paper has emphatically analysed the variation of the atmospheric circulation ultra-long wave in the three warm and three cold years of the plateau.It is outlined that,(1) the change of the energy density of ultra-long wave in lower and higher atmospheric layer, on middle-low and high latituae zones in the cold and warm year of the plateau is completely different, that is, on one side the energy density incre- , ases and on the other side it decreases. (2) The difference of the trough and ridge line distribution' of the atmospheric ultra-long wave in cold and warm year is the greatest in middle-low and high latitude zones, too,but the tendency of their change is in the opposite direction.In the middle latitude transition zone (40-60°N) the difference of the density between cold and warm years is not observable (3) In summer on subtropical zone from East Asia to West Pacific Ocean(75-175°E) there exist mainly three latitude circulation cells,the variation of which in cold and warm year of the plateau is an oscillation as billow, i.e.as one cell is strengthened (or weakened) , the other two neighboring cells are weakened (or strengthened).
出处
《地理研究》
1986年第1期32-41,共10页
Geographical Research
