Universität zu Köln

Griewank, Philipp J., Heus, Thijs ORCID: 0000-0003-2650-2423, Lareau, Neil P. and Neggers, Roel A. J. (2020). Size dependence in chord characteristics from simulated and observed continental shallow cumulus. Atmos. Chem. Phys., 20 (17). S. 10211 - 10231. GOTTINGEN: COPERNICUS GESELLSCHAFT MBH. ISSN 1680-7324

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Abstract

In this study we compare long-term Doppler and Raman 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 their associated subcloud circulations, as well as 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 horizontal mean values. The differences between the observations and simulations are smaller than the difference in sampling the modeled 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

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Griewank, Philipp J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Heus, Thijs UNSPECIFIED orcid.org/0000-0003-2650-2423 UNSPECIFIED Lareau, Neil P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Neggers, Roel A. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-319808
DOI:	10.5194/acp-20-10211-2020
Journal or Publication Title:	Atmos. Chem. Phys.
Volume:	20
Number:	17
Page Range:	S. 10211 - 10231
Date:	2020
Publisher:	COPERNICUS GESELLSCHAFT MBH
Place of Publication:	GOTTINGEN
ISSN:	1680-7324
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LARGE-EDDY SIMULATION; SUBSIDING SHELLS; CLIMATE SENSITIVITY; CLOUD POPULATIONS; LAYER; CONVECTION; AIRCRAFT; DYNAMICS; MODELS; LAND Multiple languages Environmental Sciences; Meteorology & Atmospheric Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/31980