Model for predicting potential for aircraft cold cloud precipitation enhancement in Da Xing’ anling Mountains in Inner Mongolia
Received date: 2024-09-04
Revised date: 2024-11-07
Online published: 2025-08-13
Da Xing’anling Mountains was of immeasurable significance in maintaining regional ecological balance and ecological security. However, it was also one of the key fire risk areas. The prediction model of aircraft cold cloud precipitation enhancement potential was established to provide important technical support for the precise operation of artificial rain enhancement for fire prevention and extinguishing in the Daxing’an Mountains. Based on the number concentrations of small and large cloud particles observed by aircraft from 2017 to 2020 and 2023, the potential for enhancing precipitation was divided into three categories: strongly seedable, seedable, and not seedable. Based on the ERA5 reanalysis data, the environmental parameters of the three types of precipitation enhancement potential samples were discussed, and the results showed that the relative humidity values of 750 hPa were 79.1% and 95.6%, that is, the relative humidity of the not seedable sample was less than 79.1%, and the relative humidity of the strongly seedable sample was greater than 95.6%, and the relative humidity value of the seedable sample was between the two. The dew point temperature differences at 700 hPa were 0.3 ℃ and 2.4 ℃, the vertical velocities at 650 hPa were 0.7 and -0.06 Pa·s-1, the liquid water contents at 650 and 700 hPa were 0.01 and 0.08 g·kg-1, the rainwater mixing ratios at 850 hPa were 0.01 and 0.07 g·kg-1, and the vertical cumulative supercooled water was 0.5 and 2.2 mm. Considering the accuracy with which the three samples could be distinguished using the environmental parameter thresholds and the collinearity relationships between the parameters, four environmental parameters were finally selected, and two model for predicting the potential to enhance precipitation were established using the Fisher and Bayes methods. The average recognition rate of the two models was 88.6% for the training set and 98.6% for the test set, providing strong support for the implementation of scientific and accurate weather modification operations.
YI Nana , Bilige , SHI Jinli , CAI Min , XU Zhili , ZHENG Fengjie , Lina . Model for predicting potential for aircraft cold cloud precipitation enhancement in Da Xing’ anling Mountains in Inner Mongolia[J]. Arid Zone Research, 2025 , 42(3) : 409 -419 . DOI: 10.13866/j.azr.2025.03.02
表1 内蒙古大兴安岭飞机冷云人工增雨潜势判别指标值Tab. 1 The threshold of discriminant index for the potential of artificial precipitation enhancement in cold clouds by aircraft in Da Xing’ anling Mountains in Inner Mongolia |
| 小云粒子数浓度/(个·cm-3) | |||
|---|---|---|---|
| <65 | ≥65 | ||
| 大云粒子数 浓度/(个·cm-3) | <20 | 不可播 | 强可播 |
| ≥20 | 不可播 | 可播 | |
表2 飞机冷云增雨潜势预报模型训练集与测试集的样本数Tab. 2 The number of samples in the training set and the testing set of the cold cloud precipitation enhancement potential forecast mode |
| 样本数/个 | |||
|---|---|---|---|
| 强可播 | 可播 | 不可播 | |
| 训练集 | 1571 | 922 | 1510 |
| 测试集 | 176 | 32 | 478 |
表3 样本的环境参量Tab. 3 The environmental parameters of samples |
| 强可播、可播与不可播样本环境参量 | ||||
|---|---|---|---|---|
| 第一类 | 第二类 | |||
| 降水 | 水汽 | 比湿 | 增雨 | 垂直累积过冷水 |
| 相对湿度 | 雨水混合比 | |||
| 温度露点差 | 液态水混合比 | |||
| 大气可降水量 | 冰晶混合比 | |||
| 层结 | 假相当位温 | 雪水混合比 | ||
| 温度差 | 冰面饱和水汽压 | |||
| 抬升 | 垂直速度 | |||
| 散度 | ||||
注:雨水、雪水、液态水混合比为单位质量湿空气含雨水、雪水、液态水的质量,冰晶混合比为单位质量湿空气含冰粒子的质量。 |
表4 Fisher与Bayes判别2023年测试集样本的准确率Tab. 4 Fisher and Bayes accuracy in discerning samples from the 2023 test set |
| 总样本数/个 | Fisher | Bayes | ||||
|---|---|---|---|---|---|---|
| 识别样本数/个 | 识别率/% | 识别样本数/个 | 识别率/% | |||
| 可播 | 32 | 32 | 100 | 30 | 93.8 | |
| 强可播 | 176 | 174 | 98.9 | 174 | 98.9 | |
| 不可播 | 478 | 478 | 100 | 478 | 100 | |
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