夏半年大气低频振荡与西北太平洋台风路径

ATMOSPHERE AND OCEAN LOW-FREQUENCY OSCILLATION AND THEIR EFFECTS ON TROPICAL CYCLONE TRACKS OVER THE NORTHWESTERN PACIFIC

摘要: 本文利用一个多级数字滤波器,讨论了1980年5-10月期间,大气季节内低频振荡(30-50d周期)对西北太平洋热带气旋路径的影响.结果表明,这种影响是明显的.在秋季,还存在一支源于高纬北美地区的波列,其影响可以向西、向南一直传播至东亚低纬区域,它对于形成转向路径时期的环流形势起了重要作用.

Abstract: The effect of atmospheric intra-seasonal low-frequency oscillation (30-50 day) during the period from May to October,1980 on tropical cyclone tracks are analysed.The result shows that this effect is identical.Meanwhile,in autumn,there exists a wave train which can propagate from North American at high latitudes up to East Asia at low latitudes.This wave train plays a significant role in bringing about circulation situation of the recurving path.