民国念五年三月十六日至十七日极面之移动与长江中下流之大雾

天气分析,为近年来气象学上最大之收获,气团之分布,与极面之移动既明,则短期预告,自较昔日仅凭经验之法则为准确。惟地面观测常以种种影响而不得明其真相。是故高空测候,因以日见发达。天气之预测,乃由地面之观察,进而为三度之分析。我国测候事业,尚在草创时期。测候所可用者数不满百,高空纪录,尤感缺乏。南京     

On Verification of the New Criterion of Adiabaticity by Numerical Simulation of Acoustic Propagation through the Polar Front

To assess the adiabaticity of acoustic propagation in the ocean is very important for acoustic field calculation(forward problem) and tomographic retrieving (inverse problem). A new criterion of adiabaticity is proposed recently (Shang et al., 2001). In this paper, numerical simulation has been conducted for acoustic propagation through the Polar Front to verify the new criterion. Numerical results on the f (frequency) -rn (mode number) plan demonstrate that the new criterion works very well for this extremely non-gradual ocean structure.