The influence of aerosol optical depth (AOD) on cloud droplet effective radius (CER) is closely related to the liquid water path (LWP) and the total water vapor (WV) in the atmosphere. From a spatial distribution, the interaction between AOD and CER coincided with the anti-Twomey effect in Shanghai. The high-value locations of both the AOD and CER were consistent, both found in central Shanghai. Based on a linear regression analysis of the AOD–CER relationship on a log-log scale, the results showed that the effect of AOD on CER in Shanghai followed not only the Twomey effect but also the anti-Twomey effect. This was mainly due to differing LWPs. When the LWP was less than 50 g/m², CER decreased with increasing AOD at moderate aerosol loading (AOD < 0.6), and then followed by an increase in CER with increasing AOD. Note that, the role of AOD on CER may be overestimated under this situation. Conversely, when LWP ranged from 50 g/m² to 150 g/m², CER decreased with the increase in AOD, agreeing with the Twomey effect. The effect of WV on the interaction between AOD and CER was also investigated and the results indicated that the influence of AOD on CER became larger as WV decreased.

气溶胶光学深度（AOD）对云滴有效半径（CER）的影响与大气中的液态水路径（LWP）和总水蒸气（WV）密切相关。从空间分布来看，AOD和CER之间的相互作用与上海的Twomey反作用相吻合。在上海中心地区，AOD和CER的高价值位置是一致的。基于对数-对数尺度的AOD-CER关系的线性回归分析，结果表明，AOD对上海CER的影响不仅遵循Twomey效应，而且还遵循抗Twomey效应。这主要是由于LWP不同。当LWP小于50 g / m ^2时，在中等气溶胶负荷下（AOD <0.6），CER随AOD的增加而降低，然后随着AOD的增加CER升高。请注意，在这种情况下，AOD在CER中的作用可能被高估了。相反，当LWP在50 g / m ²至150 g / m ^{2的范围内时}，CER随着AOD的增加而降低，这与Twomey效应一致。还研究了WV对AOD和CER之间相互作用的影响，结果表明，随着WV的降低，AOD对CER的影响变得更大。