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The Environmental Conditions Behind the Formation of Small (subLCL) Clouds
Geophysical Research Letters ( IF 5.2 ) Pub Date : 2021-11-16 , DOI: 10.1029/2021gl096242
Orit Altaratz 1 , Ilan Koren 1 , Eyal Agassi 2 , Eitan Hirsch 2 , Yoav Levi 3 , Nir Stav 3
Affiliation  

SubLCL clouds are defined here as clouds that form below the estimated lifting condensation level (LCL), on days that are predicted to be cloud-free. On more than 50% of those days we observed clouds. Measurements of thermodynamic and sky conditions are used here together with numerical simulations to study subLCL clouds’ formation. It was previously demonstrated that humidified parcels in mid-boundary layer (BL) are likely to be the driving mechanism. We found the height of the LCL above the BL top and the RH near the BL top to be good predictors of the appearance of these clouds. In addition, the average change in RH in the rising parcels that form them was found to have a specific constant value (4.4 urn:x-wiley:00948276:media:grl63348:grl63348-math-0001 0.2[%] per 100 m of elevation). This value enables the prediction of subLCL clouds’ formation on days that rising parcels can reach saturation while moving up in the BL.

中文翻译:

小型(subLCL)云形成背后的环境条件

SubLCL 云在此被定义为在预计无云的日子里形成的低于估计升力凝结水平 (LCL) 的云。在超过 50% 的日子里,我们观察到了云。此处使用热力学和天空条件的测量值以及数值模拟来研究 subLCL 云的形成。先前已经证明,中间边界层 (BL) 中的加湿包裹可能是驱动机制。我们发现 BL 顶部上方的 LCL 高度和 BL 顶部附近的 RH 可以很好地预测这些云的出现。此外,发现形成它们的上升地块中 RH 的平均变化具有特定的常数值 (4.4 骨灰盒:x-wiley:00948276:媒体:grl63348:grl63348-math-0001 每 100 m 高程 0.2[%])。该值可以预测 subLCL 云在上升的包裹在 BL 中向上移动时可能达到饱和的日子里的形成。
更新日期:2021-11-30
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