1985年澳大利亚高压与我国夏季降水的振荡关系

THE RELATION OF OSCILLATION BETWEEN THE HIGH PRESSURE OF AUSTRALIAN AND THE SUMMER PRECIPI-TATION OF CHINA IN 1985

摘要:

本文利用1985年6—8月气象资料和卫星云图资料,计算了南半球澳高地面气压与我国近35个台站24小时降水量的凝聚谱、位相谱,发现在准一周(约五天)周期处两者存在反位相振荡。又通过澳高地面气压与北半球有关环流系统的凝聚谱、位相谱分析,发现澳大利亚冷空气爆发与北半球夏季低纬和中纬行星尺度系统存在短周期准一周(约五天)左右遥相关。并且,东亚沿岸从南到北七个站850百帕经向风速,与澳高地面气压在周期五天左右处,有较高的凝聚平方值,风速增强过程有北传现象。

Abstract:

The author calculated the coherence spectra and phase spectra between the surface pressure of Australian high pressure and the precipitation in 24 hours of thirty five stations of China, using the meteorology and satllite information in Jun-Aug. of 1985. Some conclusions were gained. as follows: There was an osci-llation relation with out of phase at the period of one week (about five days) between them. In addition, by the coherence spectra and phase spectra analysis between surface pressure of Australian high pressure and atmosphere circulation systems in low and middle latitude in north hemisphere, we found that the teleconnection existed between them at the period of one week(about five days). According to the coherence spectra between the surface pressure of Australian high pressure and longitudinal winds of seven stations from south to north in east China at 850. hpa.we gave relative high coherence value between them and there were propagation phenomena toward north in the speed of winds.