Publication Abstracts

Endo et al. 2015

Endo, S., A.M. Fridlind, W. Lin, A.M. Vogelmann, T. Toto, A. Ackerman, G.M. McFarquhar, R.C. Jackson, and Y. Liu, 2015: RACORO continental boundary layer cloud investigations. Part II: Large-eddy simulations of cumulus clouds and evaluation with in-situ and ground-based observations. J. Geophys. Res. Atmos., 120, no. 12, 5993-6014, doi:10.1002/2014JD022525.

A 60 h case study of continental boundary layer cumulus clouds is examined using two large-eddy simulation (LES) models. The case is based on observations obtained during the RACORO Campaign (Routine Atmospheric Radiation Measurement (ARM) Aerial Facility (AAF) Clouds with Low Optical Water Depths (CLOWD) Optical Radiative Observations) at the ARM Climate Research Facility's Southern Great Plains site. The LES models are driven by continuous large-scale and surface forcings and are constrained by multimodal and temporally varying aerosol number size distribution profiles derived from aircraft observations. We compare simulated cloud macrophysical and microphysical properties with ground-based remote sensing and aircraft observations. The LES simulations capture the observed transitions of the evolving cumulus-topped boundary layers during the three daytime periods and generally reproduce variations of droplet number concentration with liquid water content (LWC), corresponding to the gradient between the cloud centers and cloud edges at given heights. The observed LWC values fall within the range of simulated values; the observed droplet number concentrations are commonly higher than simulated, but differences remain on par with potential estimation errors in the aircraft measurements. Sensitivity studies examine the influences of bin microphysics versus bulk microphysics, aerosol advection, supersaturation treatment, and aerosol hygroscopicity. Simulated macrophysical cloud properties are found to be insensitive in this nonprecipitating case, but microphysical properties are especially sensitive to bulk microphysics supersaturation treatment and aerosol hygroscopicity.

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BibTeX Citation

@article{en04000e,
  author={Endo, S. and Fridlind, A. M. and Lin, W. and Vogelmann, A. M. and Toto, T. and Ackerman, A. and McFarquhar, G. M. and Jackson, R. C. and Liu, Y.},
  title={RACORO continental boundary layer cloud investigations. Part II: Large-eddy simulations of cumulus clouds and evaluation with in-situ and ground-based observations},
  year={2015},
  journal={J. Geophys. Res. Atmos.},
  volume={120},
  number={12},
  pages={5993--6014},
  doi={10.1002/2014JD022525},
}

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RIS Citation

TY  - JOUR
ID  - en04000e
AU  - Endo, S.
AU  - Fridlind, A. M.
AU  - Lin, W.
AU  - Vogelmann, A. M.
AU  - Toto, T.
AU  - Ackerman, A.
AU  - McFarquhar, G. M.
AU  - Jackson, R. C.
AU  - Liu, Y.
PY  - 2015
TI  - RACORO continental boundary layer cloud investigations. Part II: Large-eddy simulations of cumulus clouds and evaluation with in-situ and ground-based observations
JA  - J. Geophys. Res. Atmos.
VL  - 120
IS  - 12
SP  - 5993
EP  - 6014
DO  - 10.1002/2014JD022525
ER  -

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