Sensitivity of some African heavy rainfall events to microphysics and planetary boundary layer schemes: Impacts on localised storms,Quarterly Journal of the Royal Meteorological Society

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Sensitivity of some African heavy rainfall events to microphysics and planetary boundary layer schemes: Impacts on localised storms
Quarterly Journal of the Royal Meteorological Society ( IF 3.0 ) Pub Date : 2021-04-06 , DOI: 10.1002/qj.4033
Agostino N. Meroni _{1,

2} , Kizito A. Oundo ₃ , Richard Muita ₃ , Mary‐Jane Bopape ₄ , Thizwilondi R. Maisha ₄ , Martina Lagasio ₂ , Antonio Parodi ₂ , Giovanna Venuti ₁

Affiliation

High-resolution numerical weather prediction (NWP) simulations of heavy rainfall events are known to be strongly sensitive to the choice of the sub-grid scale parameterisation schemes. In the African continent, studies on such a choice at the convective-resolving scales are not numerous. By exploiting a state-of-the-art NWP model, the Weather Research and Forecasting (WRF) model, the sensitivity of the simulation of three heavy rainfall events in Sub-Saharan Africa to the microphysical (MP) and planetary boundary layer (PBL) schemes is studied. Validating the numerical outputs against rainfall satellite estimates, ground-based weather stations, radiosonde profiles and satellite-derived cloud-top temperature maps with an object-based tool, the best-performing setup is identified. In terms of heavy rainfall forecast location, it is found that the PBL scheme has a greater impact than the MP, which is shown to control the cloud-top temperature simulation. Among the schemes considered, the best performances are achieved with a six-class single-moment microphysical scheme and a non-local planetary boundary layer scheme which properly includes the vertical mixing by the large eddies in the atmosphere.

中文翻译：

一些非洲强降雨事件对微物理和行星边界层方案的敏感性：对局部风暴的影响

众所周知，强降雨事件的高分辨率数值天气预报 (NWP) 模拟对子网格尺度参数化方案的选择非常敏感。在非洲大陆，在对流分辨尺度上对这种选择的研究并不多。通过利用最先进的 NWP 模型、天气研究和预报 (WRF) 模型，撒哈拉以南非洲的三个强降雨事件模拟对微物理 (MP) 和行星边界层 (PBL) 的敏感性) 方案进行了研究。使用基于对象的工具根据降雨卫星估计、地面气象站、无线电探空仪剖面和卫星衍生的云顶温度图验证数值输出，确定性能最佳的设置。在强降雨预报位置方面，结果表明，PBL 方案比 MP 方案具有更大的影响，这表明它可以控制云顶温度模拟。在考虑的方案中，六级单矩微物理方案和适当包括大气中大涡流垂直混合的非局部行星边界层方案实现了最佳性能。

更新日期：2021-06-03

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