Determination of the key vertical level for cloud condensation nuclei concentration (CCNC) explosions has been a long-term issue in CCN-cloud interaction studies. An idealized hailstorm is simulated with 37 sensitivity runs, including an initial CCNC grouping vertically from the ground to the cloud top, increasing from 100 to 3,000 mg⁻¹. The results reveal a key zone from 750 to 800 hPa near the median boundary layer, where an explosion of CCNC plays a dominant role in the nonmonotonic response of the hail precipitation rate. The explosion of CCNC in this zone could initially result in the condensation of more water vapor into the clouds, which could be transported to a greater vertical extent to significantly affect the riming collection efficiency. However, the dominant zone for the total precipitation rate is wider at heights of 700–800 hPa due to the lower sensitivity of the riming collection efficiency.

中文翻译：

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理想冰雹模拟中垂直云凝结核浓度爆炸的影响

云凝结核浓度（CCNC）爆炸关键垂直高度的确定一直是CCN-云相互作用研究中的一个长期问题。通过 37 次灵敏度运行来模拟理想化的冰雹，其中包括从地面到云顶垂直分组的初始 CCNC，从 100 增加到 3,000 mg ^-1。结果表明，中边界层附近有一个750~800 hPa的关键区域，该区域CCNC的爆发对冰雹降水速率的非单调响应起主导作用。 CCNC 在该区域的爆炸最初可能会导致更多的水蒸气凝结到云中，这些水蒸气可能会被输送到更大的垂直范围，从而显着影响雾化收集效率。然而，由于雾化收集效率的敏感性较低，在 700-800 hPa 高度，总降水率的主导区域较宽。