Preprints
https://doi.org/10.5194/acp-2019-1063
https://doi.org/10.5194/acp-2019-1063

  03 Dec 2019

03 Dec 2019

Status: this preprint has been withdrawn by the authors.

Effects of Liquid Phase Cloud Microphysical Processes in Mixed Phase Cumulus Clouds over the Tibetan Plateau

Xiaoqi Xu1, Chunsong Lu1, Yangang Liu2, Wenhua Gao3, Yuan Wang1, Yueming Cheng1, Shi Luo1, and Kwinten Van Weverberg4 Xiaoqi Xu et al.
  • 1Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science & Technology, Nanjing, China
  • 2Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, USA
  • 3State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China
  • 4Met Office, Exeter, UK

Abstract. Overprediction of precipitation over the Tibetan Plateau is often found in numerical simulations, which is thought to be related to coarse grid sizes or inaccurate large-scale forcing. In addition to confirming the important role of model grid sizes, this study shows that liquid-phase precipitation parameterization is another key culprit, and underlying physical mechanisms are revealed.

A typical summer plateau precipitation event is simulated with the Weather Research and Forecasting (WRF) model by introducing different parameterizations of liquid-phase microphysical processes into the commonly used Morrison scheme, including autoconversion, accretion, and entrainment-mixing mechanisms. All simulations can reproduce the general spatial distribution and temporal variation of precipitation. The precipitation in the high-resolution domain is less overpredicted than in the low-resolution domain. The accretion process plays more important roles than other liquid-phase processes in simulating precipitation. Employing the accretion parameterization considering raindrop size makes the total surface precipitation closest to the observation which is supported by the Heidke skill scores. The physical reason is that this accretion parameterization can suppress fake accretion and liquid-phase precipitation when cloud droplets are too small to initiate precipitation.

This preprint has been withdrawn.

Xiaoqi Xu et al.

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Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Xiaoqi Xu et al.

Xiaoqi Xu et al.

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This preprint has been withdrawn.

Short summary
A typical summer plateau precipitation event was simulated with the WRF model by introducing different parameterizations of liquid-phase microphysical processes and found that the low resolution is one reason responsible for the overprediction of precipitation over the Tibet Plateau. The inaccurate parameterization of accretion is another reason. It is critical to consider rain and cloud drop sizes in accretion parameterizations, which can suppress artificial accretion when drops are too small.
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