Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020GL091881 |
Sub‐cloud turbulence explains cloud‐base updrafts for shallow cumulus ensembles: First observational evidence | |
Youtong Zheng; Daniel Rosenfeld; Zhanqing Li | |
2021-03-10 | |
发表期刊 | Geophysical Research Letters |
出版年 | 2021 |
英文摘要 | Sub‐cloud turbulent kinetic energy has been used to parameterize the cloud‐base updraft velocity (wb) in cumulus parameterizations. The validity of this idea has never been proved in observations. Instead, it was challenged by recent Doppler lidar observations showing a poor correlation between the two. We argue that the low correlation is likely caused by the difficulty of a fixed‐point lidar to measure ensemble properties of cumulus fields. Taking advantage of the stationarity and ergodicity of early‐afternoon convection, we developed a lidar sampling methodology to measure wb of a shallow cumulus (ShCu) ensemble (not a single ShCu). By analyzing 128 ShCu ensembles over the Southern Great Plains, we show that the ensemble properties of sub‐cloud turbulence explain nearly half of the variability in ensemble‐mean wb, demonstrating the ability of sub‐cloud turbulence to dictate wb. The derived empirical formulas will be useful for developing cumulus parameterizations and satellite inference of wb. |
领域 | 气候变化 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/318631 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Youtong Zheng,Daniel Rosenfeld,Zhanqing Li. Sub‐cloud turbulence explains cloud‐base updrafts for shallow cumulus ensembles: First observational evidence[J]. Geophysical Research Letters,2021. |
APA | Youtong Zheng,Daniel Rosenfeld,&Zhanqing Li.(2021).Sub‐cloud turbulence explains cloud‐base updrafts for shallow cumulus ensembles: First observational evidence.Geophysical Research Letters. |
MLA | Youtong Zheng,et al."Sub‐cloud turbulence explains cloud‐base updrafts for shallow cumulus ensembles: First observational evidence".Geophysical Research Letters (2021). |
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