卢绪兰,彭新东. 2021. 尺度自适应边界层参数化及其对一次海雾的模拟影响[J]. 气象学报, (0):-, doi:10.11676/qxxb2021.003
尺度自适应边界层参数化及其对一次海雾的模拟影响
Scale‐aware parameterization of planetary boundary layer and a case study of sea fog simulation
投稿时间:2020-02-24  修订日期:2020-07-23
DOI:10.11676/qxxb2021.003
中文关键词:  边界层  尺度自适应参数化  灰色区域  海雾  数值模拟
英文关键词:Planetary boundary layer, self-adapting parameterization, grey-zone, sea fog, numerical simulation
基金项目:国家重点研发计划
作者单位E-mail
卢绪兰 成都信息工程大学 2959004344@qq.com 
彭新东 中国气象科学研究院 pengxd@cma.gov.cn 
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中文摘要:
      大气边界层湍流运动是地球大气运动最重要的能量输送过程之一。当数值模式分辨率接近活跃湍涡的长度尺度时,湍流运动被部分解析,无需全部参数化,传统的边界层方案不适合这种“灰色区域”湍流问题。为了提高模式边界层方案在包括“灰色区域”不同网格尺度的描述能力,使其适用于不同的分辨率模式需求,本研究仍然以雷诺平均湍流理论为基础,在更广的模式分辨率范围内,修正Mellor-Yamada-Nakanishi-Niino(MYNN)方案湍流长度尺度参数和非局地湍流的参数表达,改进湿度和温度在“灰色区域”的湍流输送参数化和对网格尺度的自适应能力。利用改进的MYNN尺度自适应方案,分别采用3 km和1 km、1.5 km和0.5 km分辨率单向嵌套网格WRF中尺度模式,对2014年2月26日的黄海海雾过程进行模拟试验,检验不同分辨率模式MYNN湍流参数化合理性和对海雾的模拟效果。尺度自适应MYNN边界层参数化方案在公里级网格尺度上获得稳定、合理的湍流垂直输送计算结果。参照雾区卫星云图,不同分辨率模式低层云水混合比模拟结果具有稳定表现,模拟的雾区分布和温度、湿度等物理量结构都较好再现了再分析“观测事实”,初步表明该参数化方案有较好的网格尺度自适应能力。
英文摘要:
      The turbulence in planetary boundary layer (PBL) atmosphere is one of the most important process to transport energy to maintain atmospheric movement. As model grid spacing goes closing to the length scale of energetic turbulent eddy, turbulence is partly resolved, and is therefore no need totally parameterized. The traditional PBL scheme is not suitable for the so-called “grey-zone” problem. In order to improve the capability of PBL scheme in multi-scale model, including the “grey-zone” simulation, we enhance the Mellor-Yamada-Nakanishi-Niino(MYNN) scheme by introducing non-local turbulent parameterization of heat and moisture turbulent flux and mesh-scale dependent turbulent length scale for self-adapting arrangement of PBL scheme in a wide model resolution based on the Reynolds average numerical simulation. The self-adapting MYNN scheme is used to simulate a sea-fog case in Huanghai region on February 26, 2014 using the one-way nesting Weather Research and Forecast (WRF) model with horizontal resolution of 3 km and 1 km, or 1.5 km and 0.5 km in comparison with the original MYNN scheme. The new MYNN scheme demonstrates reasonable vertical turbulent transport of heat and moisture in kilometer resolution model. Compared with satellite imageries, the integrated low-level cloud water shows similar horizontal coverage of sea fog in different resolution models with the self-adapting MYNN scheme. Vertical profiles of temperature and humidity also illustrate in well accordance with the ERA-interim reanalysis data which improves obviously the original scheme. Preliminary results show the possibility of its self-adapting ability in multi-scale models.
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