【摘要】 本文用误差传递公式讨论了涡度散度计算过程中的误差放大现象，指出放大因子的构造形式由差分方案决定，而放大因子的数值大小由流场的风向结构和风速结构决定。放大率随流场结构的变化而在很大范围内变化，致使部分区域诊断结果无信度。本文提出了散度涡度诊断结果无信度时的风场误差限概念，并相应建立了对诊断场作信度鉴别的方法。更多还原

【Abstract】 By using the theory of error propagation in this paper, error magnifing power for difference operator of divergence and vorticity is discussed. It shows that the structure and the value of error magnifing function are determined by the difference schemes and by the structures of flow pattern respectively. Amplifying rate differs widely in different flow structures, therefore, part of diagnostic field of divergence and vorticity will not be trusted. A conception of error limit for original data of wind and a method of trust identifing for diagnostic field are put forward.更多还原