Publication Abstracts

Rémillard et al. 2017

Rémillard, J., A.M. Fridlind, A.S. Ackerman, G. Tselioudis, P. Kollias, D.B. Mechem, H.E. Chandler, E. Luke, R. Wood, M.K. Witte, and J.K. Ayers, 2017: Use of cloud radar Doppler spectra to evaluate stratocumulus drizzle size distributions in large-eddy simulations with size-resolved microphysics. J. Appl. Meteorol. Climatol., 56, no. 12, 3263-3283, doi:10.1175/JAMC-D-17-0100.1.

A case study of persistent stratocumulus over the Azores is simulated using two independent large-eddy simulation (LES) models with bin microphysics, and forward-simulated cloud radar Doppler moments and spectra are compared with observations. Neither model is able to reproduce the monotonic increase of downward mean Doppler velocity with increasing reflectivity that is observed under a variety of conditions, but for differing reasons. To a varying degree, both models also exhibit a tendency to produce too many of the largest droplets, leading to excessive skewness in Doppler velocity distributions, especially below cloud base. Excessive skewness appears to be associated with an insufficiently sharp reduction in droplet number concentration at diameters larger than ~200 µm, where a pronounced shoulder is found for in situ observations and a sharp reduction in reflectivity size distribution is associated with relatively narrow observed Doppler spectra. Effectively using LES with bin microphysics to study drizzle formation and evolution in cloud Doppler radar data evidently requires reducing numerical diffusivity in the treatment of the stochastic collection equation; if that is accomplished sufficiently to reproduce typical spectra, progress toward understanding drizzle processes is likely.

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BibTeX Citation

@article{re09000j,
  author={Rémillard, J. and Fridlind, A. M. and Ackerman, A. S. and Tselioudis, G. and Kollias, P. and Mechem, D. B. and Chandler, H. E. and Luke, E. and Wood, R. and Witte, M. K. and Ayers, J. K.},
  title={Use of cloud radar Doppler spectra to evaluate stratocumulus drizzle size distributions in large-eddy simulations with size-resolved microphysics},
  year={2017},
  journal={J. Appl. Meteorol. Climatol.},
  volume={56},
  number={12},
  pages={3263--3283},
  doi={10.1175/JAMC-D-17-0100.1},
}

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RIS Citation

TY  - JOUR
ID  - re09000j
AU  - Rémillard, J.
AU  - Fridlind, A. M.
AU  - Ackerman, A. S.
AU  - Tselioudis, G.
AU  - Kollias, P.
AU  - Mechem, D. B.
AU  - Chandler, H. E.
AU  - Luke, E.
AU  - Wood, R.
AU  - Witte, M. K.
AU  - Ayers, J. K.
PY  - 2017
TI  - Use of cloud radar Doppler spectra to evaluate stratocumulus drizzle size distributions in large-eddy simulations with size-resolved microphysics
JA  - J. Appl. Meteorol. Climatol.
VL  - 56
IS  - 12
SP  - 3263
EP  - 3283
DO  - 10.1175/JAMC-D-17-0100.1
ER  -

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