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Object-based evaluation of precipitation systems in convection-permitting regional climate simulation over eastern China
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  • Ziyue Guo,
  • Jianping Tang,
  • Jie Tang,
  • Juan Fang,
  • Wei Luo
Ziyue Guo
School of Atmospheric Sciences
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Jianping Tang
School of Atmospheric Sciences, Nanjing University
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Jie Tang
Shanghai Typhoon Institute, China Meteorological Administration, Shanghai, China
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Juan Fang
Nanjing University

Corresponding Author:[email protected]

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Wei Luo
Department of Computer Science and Technology
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Based on the object-based tracking algorithm, the precipitation simulation ability of the convection-permitting (CP) regional climate models (RCMs) is evaluated from the viewpoints of the precipitation systems in this work. The characteristics of precipitation systems over eastern China during 1998-2007 derived from the Weather Research and Forecasting model (WRF) with the horizontal grid spacing of ~ 4 km are compared with CMORPH. On the whole, CP RCMs can capture the average duration and eccentricity of all precipitation systems reasonably. However, precipitation systems tend to be stronger but with smaller coverage area in CP RCMs, which leads to the wet biases and dry biases of accumulated precipitation amount in the longer-duration (>= 48 hr) and shorter-duration (< 48 hr) systems, respectively. Such deficiencies in accumulated precipitation amount of precipitation systems with various durations can be made up by employing spectral nudging technique in CP RCMs to a certain degree. This work further indicates that, to improve the capability of precipitation simulation in CP RCMs, the relationship between intensity and coverage area of precipitation systems should be described properly in CP RCMs, especially for those with shorter-duration.
16 Jan 2022Published in Journal of Geophysical Research: Atmospheres volume 127 issue 1. 10.1029/2021JD035645