Characteristic Analysis of the Cloud Macroscopic Structure in the East Henan Plain

Jing Wenyi; Zhang Wenyu; Wang Pengxiang; Cui Liman; Li Mingjun; Wang Xuesen

doi:10.16765/j.cnki.1673-7148.2025.03.005

Abstract：Using millimeter wave cloud radar data from Shangqiu Station of the East Henan Plain from April 2022 to December 2023,the frequency and vertical structure characteristics of clouds in this area are analyzed.The results show that the proportion of clear sky is 60.2％and the frequency of non-precipitation cloud is 36.3％throughout the year.For non-precipitation clouds,the vertical structure analysis suggests that the single-layer cloud has the highest occurrence frequency,with a monthly average frequency of 60.1％.The cloud base height analysis reveals that the medium and high clouds appear more frequently,with average monthly frequency of 40.7％and 34.3％,respectively.The macro param-eters of non-precipitation clouds have significant variations in different seasons.The cloud base height is most frequently seen at the 6-7 km height in spring and summer,while in autumn and winter it appears most frequently at the height of 5-6 km.In terms of cloud top height,it often reaches the highest height at 9-10 km in spring,8-9 km in autumn,and 7-8 km in winter.The frequency of cloud thickness less than 4 km in different seasons is above 75.0％.By comparing the macro parameters of near-precipitation clouds and non-precipitation clouds,it is found that the frequency of 10-20 dBZ echo intensity exceeds 30.0％from the height below 5 km to cloud base.When the cloud base height is less than 2 km,the cloud top height is higher than 4 km,and the cloud thickness is more than 3 km,precipitation is prone to occur.