Locally narrow droplet size distributions are ubiquitous in stratocumulus clouds
▲ 作者:
NITHIN ALLWAYIN, MICHAEL L. LARSEN et al.
▲ 链接:
https://www.science.org/doi/10.1126/science.adi5550
IF: 56.9
Q1
▲ 摘要:
当前,全球气候模式(GCMs)将云中的液滴尺寸分布参数化为广泛的云平均伽马。通过使用离散层积云体积的数字全息测量,我们发现云中液滴尺寸分布在厘米尺度上更窄,与云朵的平均值完全不同。
这些局部分布倾向于形成更相似的云区域的“口袋”,每个区域的特征是尺寸分布形状被稀释到不同程度。这些观察结果为微物理过程的新建模表征开辟了道路。
▲ Abstract:
Current global climate models (GCMs) parameterize cloud droplet size distributions as broad, cloud-averaged gammas. Using digital holographic measurements of discrete stratocumulus cloud volumes, we found cloud droplet size distributions to be narrower at the centimeter scale, never resembling the cloud average. These local distributions tended to form pockets of similar-looking cloud regions, each characterized by a size distribution shape that is diluted to varying degrees. These observations open the way for new modeling representations of microphysical processes.
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