利用FY-4A卫星反演产品对飞机增雨作业的分析

A Case Analysis of FY-4A Satellite-Retrieved of Artificial Precipitation Enhancement Operation

本文利用FY-4A卫星反演的云降水微物理特征参数,分析了2018年10月8日的一次飞机增雨前层状云的微物理结构和特征参数变化,得到四川盆地秋季层状云增雨潜力区的分布,结果表明:(1)此次作业过程,四川盆地大部分地区覆盖中低云,局部有高云,中低云含有丰富的过冷水,云底粒子较小10～15μm,主要通过凝结过程增长;(2)此次作业过程,云系随时间的演变特征为从中午到傍晚,云层加厚,云顶升高,粒子有效半径增长,有大片过冷水区,但是缺乏大滴和冰晶,降水不充分;(3)在无高云配置下,中低云区产生的地面降水较小,而有高低云共同配置和粒子有效半径较大的地区,降水更为充沛;(4)利用统计检验中的区域对比分析、双比分析和区域历史回归分析方法对本次飞机增雨进行分析后表明,对具有丰富过冷水区的中低云进行人工引晶后,绝对增雨量分别为1. 81mm(对比分析)、1. 26mm(双比分析)、1. 69mm(区域历史回归分析)。利用FY-4A卫星反演方法能够提供云和降水高时空分辨率的物理特征参数演变,丰富了云和降水宏微观物理信息,为人工增雨判别增雨潜力区和准确把握增雨时机提供了一种新的方法。

A new applicable tool will be provided for satellite detection of the conditions of precipitation enhancement.A precipitation process of stratiform clouds from 8 October,2018 was selected to analyze rainfall enhancement with FY-4A satellite retrieval products.The retrieval microphysical characteristics of the clouds are as follows:①Most parts of Sichuan basin are covered with medium-low clouds with rich supercooled water,and some parts have high clouds,the effective radius(Re)of cloud base was 10~15μm;②The characteristics of cloud evolution from noon to dusk,cloud top were raised,the effective radius(Re)was increased,the clouds were rich in supercooled water but lack of ice crystals or large drops;③Rainfall occurred under the participation of high clouds;④There was a good opportunity for rainfall enhancement because of the existence of sustained and stable stratiform clouds.