Size-dependence in chord characteristics from simulated and observed continental shallow cumulus

doi:10.5194/acp-2020-338

GSTDTAP > 地球科学

DOI	10.5194/acp-2020-338
	Size-dependence in chord characteristics from simulated and observed continental shallow cumulus
	Philipp J. Griewank, Thijs Heus, Neil P. Lareau, and Roel A. J. Neggers
	2020-04-29
发表期刊	Atmospheric Chemistry and Physics
出版年	2020
英文摘要	In this study, we compare long-term lidar observations against a full month of large eddy simulations of continental shallow cumulus clouds. The goal is to evaluate if the simulations can reproduce the mean observed vertical velocity and moisture structure of cumulus clouds, and to establish if these properties depend on the size of the cloud. We propose methods to compare continuous chords of cloud detected from Doppler and Raman lidars with equivalent chords derived from 1D and 3D model output. While the individual chords are highly variable, composites of thousands of observed and millions of simulated chords contain a clear signal. We find that the simulations underestimate cloud size and fraction, but successfully reproduce the observed structure of vertical velocity and moisture perturbations. There is a clear scaling of vertical velocity and moisture anomalies below the chords with chord size, but the moisture anomalies are only 1–2 % higher than the horizontally mean values. The differences between the observations and simulations is smaller than the difference in sampling the modelled chords in time or space. The shape of the vertical velocity and moisture anomalies from cloud chords sampled spatially from 3D model snapshots is almost perfectly symmetric. In contrast, the chords sampled temporally from the lidar observations and 1D model output have a marked asymmetry with stronger updrafts and higher moisture anomalies occurring earlier on.
领域	地球科学
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/248876
专题	地球科学
推荐引用方式 GB/T 7714	Philipp J. Griewank, Thijs Heus, Neil P. Lareau, and Roel A. J. Neggers. Size-dependence in chord characteristics from simulated and observed continental shallow cumulus[J]. Atmospheric Chemistry and Physics,2020.
APA	Philipp J. Griewank, Thijs Heus, Neil P. Lareau, and Roel A. J. Neggers.(2020).Size-dependence in chord characteristics from simulated and observed continental shallow cumulus.Atmospheric Chemistry and Physics.
MLA	Philipp J. Griewank, Thijs Heus, Neil P. Lareau, and Roel A. J. Neggers."Size-dependence in chord characteristics from simulated and observed continental shallow cumulus".Atmospheric Chemistry and Physics (2020).