DAI Xinlu,CHEN Baode,ZHANG Xu,et al.Effects of the Local and Nonlocal Mixing of Planetary Boundary Layer Parameterization Schemes in a High Resolution Numerical Forecast Model[J].Journal of Chengdu University of Information Technology,2019,(05):543-551.[doi:10.16836/j.cnki.jcuit.2019.05.016]
边界层参数化方案中局地与非局地混合在高分辨率数值预报模式中的作用和影响
- Title:
- Effects of the Local and Nonlocal Mixing of Planetary Boundary Layer Parameterization Schemes in a High Resolution Numerical Forecast Model
- 文章编号:
- 2096-1618(2019)05-0543-09
- Keywords:
- meteorology; numerical weather forecast; planetary boundary layer parameterization scheme; local mixing; nonlocal mixing; high resolution numerical forecasting model
- 分类号:
- P457.6
- 文献标志码:
- A
- 摘要:
- 为研究不同边界层参数化方案以及局地混合作用和非局地混合作用在高分辨率数值预报中的作用与影响,基于第二代华东区域中尺度数值预报系统,对两次暴雨天气过程进行了模拟。通过对模拟结果中各边界层物理量进行对比分析,主要结论如下:(1)参数化方案中非局地作用越强,模拟出的边界层垂直湍流混合作用越强,混合层深厚,其中动、热能和水汽的垂直输送也较强,位温垂直廓线在白天也更为稳定。(2)非局地混合作用在强降水过程中使湍流混合作用更强,可产生更多降水,其对大雨及以上量级的降水效率影响最大,局地混合作用对小量级的降水效率影响较大。(3)使用了边界层参数化方案后近地层物理量的日变化较未使用边界层参数化方案时更加明显; 而海洋区域各方案均无明显日变化。
- Abstract:
- In order to study the effects of local and non-local mixing of different planetary boundary layer parameterization schemes in high resolution numerical forecast model, this work simulated two cases of heavy rainfall processes based on WRF ADAS Real-time Modeling System 2.0. By comparing and analyzing the physical quantities in the simulation results, the main conclusions are as follows:(1)The stronger the non-local effect of the parameterization scheme, the stronger the vertical turbulent mixing effect of the simulated boundary layer, also the mixing layer much deeper. The vertical transport of kinetic energy, thermal energy and water vapor is also stronger, and the vertical profile of the potential temperature is more stable during the day.(2)The stronger turbulent mixing during heavy rainfall in nonlocal mixing made contribution to more precipitation. Nonlocal mixing had the strong effect on precipitation efficiency of heavy rain, while the local mixing had more influence on the light precipitation.(3)The near surface variables showed an obvious diurnal cycle after using the boundary layer parameterization schemes. When the planetary boundary layer parameterization scheme was turned off, the water vapor could not be transported vertically by turbulent mixing, hence less precipitation was produced. The diurnal cycle of near surface variable was not found in the marine area.
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备注/Memo
收稿日期:2019-03-28基金项目:国家自然科学基金青年科学基金资助项目(41505087); 国家自然基金面上资助项目(41575101); 国家自然科学基金资助项目(91537214); 国家重点研发计划资助项目(2018YFC1505702)