中国蒸发观测最初使用φ20 cm和φ80 cm蒸发皿,1980年左右更换成E601型。为利用前期蒸发数据,将东溪口站陆上蒸发场的φ20 cm、φ80 cm蒸发皿蒸发量与E601型进行了对比分析。结果证明E601型和φ20 cm的相关系数基本上大于0.9。E601型和φ80 cm的相关系数都在可接受的范围内。此外,通过比较不同蒸发场上相同蒸发皿的蒸发量,发现E601型在漂浮蒸发场的观测量相较陆上存在滞后性;φ20 cm不存在。最后,将漂浮蒸发场上E601型、φ20cm和TTN-3000观测量对比分析,相关性不好,不可换算。
Evaporation was initially measured by φ20 em and φ80 cm pan, and replaced by E601 pan around 1980. In order to make use of previous pan evaporation data, we compare the evaporation measured with φ20 cm,gv80 cm to that by E601. The results reveal that the corre- lation coefficients between evaporation data measured by E601 and φ20 cm are very high, whose values are much higher than 0.9. Likewise, the performance of coefficient correlations between data of E601 and φ80 cm is good and within the acceptable scope. In addition, this study studies the difference between evaporation data measured by the same pan, but under different places, i.e., on land and water. The results demonstrate that a time lag exists between two types of data within E601, but not for φ20 cm. Finally, a comparison among evaporation data measured by E601, φ20 cm and TTN-3000 on water are also done in this study. Nevertheless, the correlation coefficients among these data are various and undesirable. Therefore, the conversions among them are not recommended and not suitable for use.