【摘要】 通过引进δ＝Ｈ＿１／Ｈ＿２参数，对两层模式中的正压波和斜压波（考虑了层结作用）的三波共振进行了研究，结果表明：δ叁数对三波共振条件有很大的影响；并进一步讨论了在一定初始振幅的条件下，δ参数和非线性强度对三波共振周期的影响；指出：在一定的初始振佰、δ参戮和非线性强度的条件下，大气中可以形成６０天以上的甚低频振荡及３０～６０天和准两周的低须振荡。更多还原

【Abstract】 In this paper,the parameter δ＝ H₁／H₂ is intreduced and applied to investigate three-waveresonant interaction between barotropic wave and baroclinic waves.The results show that theparameter δ has great effect on the cond ition of three-wave resonance,and the effects of parameter δand nonlinear strength on periods of three-wave resonance for a certam initial amplitude is discussed，it can be seen that very low frequency more than 60 day，30～60 day and quasi-biweek oscillationsappear for the appropriate initial amplitude，paran1eter δ and nonlinear strength．更多还原