摘要
利用观测资料,分别使用Batterworth带通滤波器和31点低通滤波器滤出天气尺度瞬变波,计算其方差分布后进行分析。结果表明,31点低通滤波器的滤波效果优于Batterworth带通滤波器,并且在厄尔尼诺年和反厄尔尼诺年效果更为显著。此外,在分别使用两种滤波器的情况下进一步分析、比较对时间序列直接滤波和剔除纬向平均的时间序列再滤波的结果,发现纬向对称部分的瞬变扰动对瞬变波的影响非常小,几乎可以忽略不计。
The synoptic transient waves are separated in this paper in the context of the NCEP/NCAR daily reanalysis data in 1982-1985 by use of Batterworth band-pass filter and the 31-point low-pass filter, and their variances are also computed. The analysis results suggest that the 31-point filter is superior to the Batterworth filter in filtering performance for synoptic transient waves. The analysis and comparison of the filtering results of the time series of geopotential heights with/without the zonally mean indicate that the effect of zonally symmetric fluctuations on transient wave is very fiant neglectable.
出处
《南京气象学院学报》
CSCD
北大核心
2006年第4期549-554,共6页
Journal of Nanjing Institute of Meteorology
基金
国家自然科学基金重点资助项目(40331010)
江苏省气象灾害重点实验室项目
