用三点法计算散度和涡度所出现的计算误差试验

TEST OF ERRORS ARISEN FROM THREE-POINT COMPUTATION OF DIVERGENCE AND VORTICITY

本文用我国74个高空观测站联结成三角形网,并用不同波长和位相的理想风场,准确地检验了三点法汁算散度和涡度所可能出现的计算误差。结果证明了三点法所计算的散度值,其误差可达到或超过天气系统散度的数量级,所得到的天气尺度和中尺度特征完全有可能是虚假的。涡度场值也可能存在很大的误差。

The possible errors givpn by 3-point computation of divergence and vorticity are tested, using 74 aeroiogical stations and the ideal wind fied. Ie shows that the erorrs of divergence may reach or exceed the order of magnitude of divergence. The specificity of the synoptic-scale and the meso-scale as resulted from 3-point methods may be faulty. The significant errors may also exist in the vorticity field.