effects of model resolution and parameterizations on the simulations of clouds, precipitation, and their interactions with aerosols

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ID: 133943
2018
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Abstract
This study investigates the roles played by model resolution and microphysics parameterizations in the well-known uncertainties or errors in simulations of clouds, precipitation, and their interactions with aerosols by the numerical weather prediction (NWP) models. For this investigation, we used cloud-system-resolving model (CSRM) simulations as benchmark simulations that adopt high-resolution and full-fledged microphysical processes. These simulations were evaluated against observations, and this evaluation demonstrated that the CSRM simulations can function as benchmark simulations. Comparisons between the CSRM simulations and the simulations at the coarse resolutions that are generally adopted by current NWP models indicate that the use of coarse resolutions as in the NWP models can lower not only updrafts and other cloud variables (e.g., cloud mass, condensation, deposition, and evaporation) but also their sensitivity to increasing aerosol concentration. The parameterization of the saturation process plays an important role in the sensitivity of cloud variables to aerosol concentrations. while the parameterization of the sedimentation process has a substantial impact on how cloud variables are distributed vertically. The variation in cloud variables with resolution is much greater than what happens with varying microphysics parameterizations, which suggests that the uncertainties in the NWP simulations are associated with resolution much more than microphysics parameterizations.
Reference Key
lee2018atmosphericeffects Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;S. S. Lee;Z. Li;Y. Zhang;H. Yoo;S. Kim;B.-G. Kim;Y.-S. Choi;J. Mok;J. Um;K. O. Choi;D. Dong
Journal Journal of agricultural and food chemistry
Year 2018
DOI
10.5194/acp-18-13-2018
URL
https://www.atmos-chem-phys.net/18/13/2018/acp-18-13-2018.pdf
Keywords
physicschemistry

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