摘要
本文求出了声重波传播过程中,低热层臭氧含量振荡和温度场起伏间的耦合关系。首次揭示出其正负相关性的内在原因和判据——动力扰动尺度。在中小尺度声重波扰动范围内,臭氧含量振荡与温度场起伏是正相关的,且相关幅度可达或超过7;而在大尺度或行星尺度波范围内,则一般为负相关。此发现可解释低热层中臭氧含量快速变化及臭氧含量长时间纬圈平均值变化与温度场成负相关的观测事实。本文还在声重波尺度范围内比较了线性和非线性理论的结果,结果表明两者没有太大的差异。
In the course of acoustic-gravity wave (AGW) propagation, a coupling relation between the ozone density oscillations (ODO) and temperature fluctuations (TF) in the lower ther-mosphere is presented. The physical essences of the relation mentioned are analyzed and a criterion is suggested that positive or negative coupling relation is mainly dependent upon the scales of the dynamical perturbations. On a small and medium AGW scale, the coupling relation between ODO and TF is always positive, and the amplitude of coupling relation can be or exceed 7; on the large AGW scale or planetary-wave scale, the coupling relation becomes negative. This finding may explain the important facts in observations that the ozone density and temperature in the upper mesosphere and lower thermosphere appear to be in fast variations and the zonal mean values of ozone density over a long time are often in opposite phase relative to the temperature fluctuations. A further comparison indicates, there is no obvious difference between the influences on the criterion by using linear or nonlinear AGW theories.
出处
《空间科学学报》
CAS
CSCD
北大核心
1991年第4期278-285,共8页
Chinese Journal of Space Science
基金
国家自然科学基金资助课题
关键词
低热层
臭氧
声重波
动力扰动判据
Lower thermosphere, Ozone density, Acaustic-gravity wave, Dynamical perturbation criterion
