Abstract
A double-plume convective parameterization scheme is revised to improve the precipitation simulation of a global model (Global-to-Regional Integrated Forecast System; GRIST). The improvement is achieved by considering the effects of large-scale dynamic processes on the trigger of deep convection. The closure, based on dynamic CAPE, is improved accordingly to allow other processes to consume CAPE under the more restricted convective trigger condition. The revised convective parameterization is evaluated with a variable-resolution model setup (110−35 km, refined over East Asia). The Atmospheric Model Intercomparison Project (AMIP) simulations demonstrate that the revised convective parameterization substantially delays the daytime precipitation peaks over most land areas, leading to an improved simulated diurnal cycle, evidenced by delayed and less frequent afternoon precipitation. Meanwhile, changes to the threshold of the trigger function yield a small impact on the diurnal amplitude of precipitation because of the consistent setting of dCAPE-based trigger and closure. The simulated mean precipitation remains reasonable, with some improvements evident along the southern slopes of the Tibetan Plateau. The revised scheme increases convective precipitation at the lower levels of the windward slope and reduces the large-scale precipitation over the upper slope, ultimately shifting the rainfall peak southward, which is in better agreement with the observations.
摘 要
本研究在双羽对流参数化方案的触发条件中考虑了大尺度动力过程的影响,从而提高了全球-区域一体化预测系统(GRIST)对降水过程的模拟能力。文中还针对不同的触发条件,对基于动态对流有效位能(CAPE)的闭合假设进行了改进,使其它他物理过程在更严格的对流触发条件下消耗CAPE。并基于加密东亚地区的变分辨率(110–35 km)AMIP模拟,评估了改进方案对降水模拟的影响。结果表明,改进方案推迟了陆地日降水峰值的发生时间,减少了午后降水频率,使模拟降水日循环得以改善。同时,得益于相匹配的动态闭合假设,触发阈值变化对降水变化强度的影响很小。此外,降水平均态也比较合理,青藏高原南坡的降水分布亦有改进。迎风低坡的对流降水量增加,从而减少了水汽向高坡的输送、削弱了高坡上虚假的大尺度降水量,使降水峰值南移,模拟结果更接近观测。
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Data Availability Statement
The observational datasets used in this study are available from GPCP —https://www.esrl.noaa.gov/psd/data/gridded/data.gpcp.html; and GPM—https://doi.org/10.5067/GPM/IMERG/3B-HH/06. The model output data supporting this study are available in the open data repository Zenodo at: https://doi.org/10.5281/zenodo.6501705.
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Acknowledgements
This study was supported by the National Key R&D Program of China on the Monitoring, Early Warning, and Prevention of Major Natural Disasters (Grant Nos. 2018YFC1507005 and 02017YFC1502202).
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• A double-plume convective parameterization is improved by adding the effects of large-scale dynamic processes on the trigger of deep convection.
• The revised trigger and closure of convection substantially improve the diurnal phase of precipitation and yield a small impact on the diurnal amplitude.
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Impact of Revised Trigger and Closure of the Double-Plume Convective Parameterization on Precipitation Simulations over East Asia
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Li, X., Zhang, Y., Lin, Y. et al. Impact of Revised Trigger and Closure of the Double-Plume Convective Parameterization on Precipitation Simulations over East Asia. Adv. Atmos. Sci. 40, 1225–1243 (2023). https://doi.org/10.1007/s00376-022-2225-9
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DOI: https://doi.org/10.1007/s00376-022-2225-9