Numerical study of the precipitation diurnal variation and its relationship with cloud radiative heating during the Meiyu period in 2020

IF 1.9 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Lu Gao, Qian Huang, Suxiang Yao, Tianle Sun
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引用次数: 0

Abstract

Based on hourly rain gauge observation, cloud amount, and radiative fluxes data from the Clouds and the Earth’s Radiant Energy System (CERES) and ECMWF Reanalysis v5 (ERA5) dataset, the precipitation process during the Meiyu period in the middle and lower reaches of the Yangtze River in 2020 was simulated in WRF to reveal the influence of cloud radiative heating process on the diurnal variation of precipitation using multiple cloud microphysical schemes. The statistical evaluation of three microphysical parameterization schemes shows that the two-moment scheme WDM6 is more reasonable than the other two schemes in simulating the precipitation distribution, central intensity, and cloud characteristic distribution. There are significant bimodal characteristics in the diurnal variation of precipitation during the Meiyu period by analyzing the observation data. The numerical experiment accurately simulated the time and magnitude of the early morning peak in the heavy rain area but failed to reproduce the peak in the late afternoon, resulting in a false weak rainfall accumulation. The comparison of simulation results with the observed cloud macroscale and microscale characteristics revealed that the reason for the deviation of precipitation simulation was closely related to the inaccurate description of cloud microphysical quantities. The lack of ice phase cloud droplets led to excessively strong radiative heating rate at 200–500 hPa, resulting in anomalous warming in the mid-upper troposphere. Meanwhile, the cold advection at 850 hPa led to anomalous cooling in the lower troposphere, increasing atmospheric stability and further inhibiting the development of the afternoon thermal convection process.

Abstract Image

2020年梅雨期降水日变化及其与云辐射加热关系的数值研究
基于逐时雨量计观测、云与地球辐射能量系统(CERES)和ECMWF Reanalysis v5 (ERA5)数据集云量和辐射通量资料,在WRF中模拟了2020年长江中下游梅雨期降水过程,采用多种云微物理方案揭示了云辐射加热过程对降水日变化的影响。对三种微物理参数化方案的统计评价表明,双矩方案WDM6在模拟降水分布、中心强度和云量特征分布方面比其他两种方案更为合理。通过对观测资料的分析,梅雨期降水日变化具有显著的双峰特征。数值试验较准确地模拟了暴雨区清晨高峰的时间和强度,但未能再现下午晚些时候的高峰,造成了虚假的弱降水积累。将模拟结果与观测到的云宏观尺度和微观尺度特征进行比较,发现降水模拟偏差的原因与云微物理量描述不准确密切相关。冰相云滴的缺乏导致200 ~ 500 hPa辐射升温速率过大,导致对流层中高层异常升温。同时,850 hPa冷平流导致对流层下层异常降温,增加了大气稳定性,进一步抑制了午后热对流过程的发展。
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来源期刊
Meteorology and Atmospheric Physics
Meteorology and Atmospheric Physics 地学-气象与大气科学
CiteScore
4.00
自引率
5.00%
发文量
87
审稿时长
6-12 weeks
期刊介绍: Meteorology and Atmospheric Physics accepts original research papers for publication following the recommendations of a review panel. The emphasis lies with the following topic areas: - atmospheric dynamics and general circulation; - synoptic meteorology; - weather systems in specific regions, such as the tropics, the polar caps, the oceans; - atmospheric energetics; - numerical modeling and forecasting; - physical and chemical processes in the atmosphere, including radiation, optical effects, electricity, and atmospheric turbulence and transport processes; - mathematical and statistical techniques applied to meteorological data sets Meteorology and Atmospheric Physics discusses physical and chemical processes - in both clear and cloudy atmospheres - including radiation, optical and electrical effects, precipitation and cloud microphysics.
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