摘要
利用准地转正压涡度方程全球谱模式,对三个行星波准共振相互作用作了数值试验,取两类准共振波矢:(1)K_1+K_2+K_3=0,ω_1+ω_2+ω_3=Δω;(2)k_1+k_2+k_3=0,l_1+l_2+l_3=Δl,ω_1+ω_2+ω_3=0,分别积分90 d,得到了一些重要结果:(1)纬向波数 k=1,2,3的三个行星波存在着较强的波一波相互作用;(2)由于波波相互作用.这三个行星波存在着周期为20～45 d 左右的低频振荡,并且还普遍存在着准双周振荡;(3)上述低频周期与三个波的初始振幅有关。
Using a global spectral model of the quasi-geostrophic barotropic vorticity equation, numerical study is made of the quasi-resonance interaction of three planetary waves.With two quasi-resonance wavevectors selected as 1)K_1+K_2+K_3=0,ω_1+ω_2+ω_3=Δω;2)k_1+k_2+k_3=0, l_1+l_2+l_3=Δl,ω_1+ω_2+ω_3=0,model integrations are run for 90 days,separately,leading to the results of interest as follows:1)stronger wave-wave interplay is found among the three waves of zonal wavenumber k=1,2,3;2)due to the interactions,the study waves exhibit about 20-45-day low-frequency oscillations and it is of note that all of the waves display quasi-biweekly oscillations;3)the mentioned low-frequency periods relate to the initial amplitude of the waves under investigation.
出处
《南京气象学院学报》
CSCD
1996年第1期1-7,共7页
Journal of Nanjing Institute of Meteorology
基金
国家自然科学基金
中国科学院大气物理研究所 LASG 国家重点实验室资助项目
关键词
波动准共振
数值试验
低频振荡
大气波动
wave quasi-resonance
numerical study
low-frequency oscillation
