Publication Abstracts

Zheng et al. 2020

Zheng, X., S.A. Klein, V.P. Ghate, S. Santos, J. McGibbon, P. Caldwell, P. Bogenschutz, W. Lin, and M.P. Cadeddu, 2020: Assessment of precipitating marine stratocumulus clouds in the E3SMv1 atmosphere model: A case study from the ARM MAGIC field campaign. M. Weather Rev., 148, no. 8, 3341-3359, doi:10.1175/MWR-D-19-0349.1.

This paper presents a process-oriented evaluation of precipitating stratocumulus and its transition to cumulus in version 1 of the Energy Exascale Earth System Model (E3SMv1) using comprehensive case-study observations from a field campaign of the Atmospheric Radiation Measurement program (ARM). The E3SMv1 single-column model (SCM) of the marine boundary layer and its low clouds and precipitation are compared to observations including subcloud drizzle retrievals from a combination of Doppler radar and lidar backscatter measurements. The SCM is also compared to a large-eddy simulation (LES) of the same case. The combination of advanced remote sensing observations and LES is a powerful framework to evaluate the physical parameterizations of large-scale models. Given the observed large-scale environment, the E3SMv1 SCM realistically represents the evolution of clouds and boundary layer structure during the stratocumulus-to-cumulus transition. The model well simulates the liquid water path and its diurnal cycle in the stratocumulus period as well as the two-layer vertical thermodynamic structure and lower cloud fraction in the transition period. E3SMv1's success in simulating the cloud in the stratocumulus period permitted examination of its precipitation processes. Here problems were identified with E3SMv1 producing an unrealistically small subcloud precipitation fraction, an unrealistic double peak in the vertical profiles of precipitation mass, and drizzle that evaporates too close to the surface. Further model diagnostics determined that these unrealistic characteristics resulted from an overly long microphysics time step and an unrealistic parameterization of the precipitation fraction. These results imply that careful consideration of these issues is needed in order to better simulate precipitation processes in marine stratocumulus.

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BibTeX Citation

@article{zh05400t,
  author={Zheng, X. and Klein, S. A. and Ghate, V. P. and Santos, S. and McGibbon, J. and Caldwell, P. and Bogenschutz, P. and Lin, W. and Cadeddu, M. P.},
  title={Assessment of precipitating marine stratocumulus clouds in the E3SMv1 atmosphere model: A case study from the ARM MAGIC field campaign},
  year={2020},
  journal={M. Weather Rev.},
  volume={148},
  number={8},
  pages={3341--3359},
  doi={10.1175/MWR-D-19-0349.1},
}

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RIS Citation

TY  - JOUR
ID  - zh05400t
AU  - Zheng, X.
AU  - Klein, S. A.
AU  - Ghate, V. P.
AU  - Santos, S.
AU  - McGibbon, J.
AU  - Caldwell, P.
AU  - Bogenschutz, P.
AU  - Lin, W.
AU  - Cadeddu, M. P.
PY  - 2020
TI  - Assessment of precipitating marine stratocumulus clouds in the E3SMv1 atmosphere model: A case study from the ARM MAGIC field campaign
JA  - M. Weather Rev.
VL  - 148
IS  - 8
SP  - 3341
EP  - 3359
DO  - 10.1175/MWR-D-19-0349.1
ER  -

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