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Sensitivity test of parameterizations of subgrid-scale orographic form drag in the NCAR CESM1

机译：NCAR CESM1中亚网格规模地形形式阻力参数化的敏感性测试

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摘要

Turbulent drag caused by subgrid orographic form drag has significant effects on the atmosphere. It is represented through parameterization in large-scale numerical prediction models. An indirect parameterization scheme, the Turbulent Mountain Stress scheme (TMS), is currently used in the National Center for Atmospheric Research Community Earth System Model v1.0.4. In this study we test a direct scheme referred to as BBW04 (Beljaars et al. in Q J R Meteorol Soc 130:1327-1347, 2004., which has been used in several short-term weather forecast models and earth system models. Results indicate that both the indirect and direct schemes increase surface wind stress and improve the model's performance in simulating low-level wind speed over complex orography compared to the simulation without subgrid orographic effect. It is shown that the TMS scheme produces a more intense wind speed adjustment, leading to lower wind speed near the surface. The low-level wind speed by the BBW04 scheme agrees better with the ERA-Interim reanalysis and is more sensitive to complex orography as a direct method. Further, the TMS scheme increases the 2-m temperature and planetary boundary layer height over large areas of tropical and subtropical Northern Hemisphere land.
机译：亚网格地形形式的阻力引起的湍流阻力对大气有重要影响。它通过在大型数值预测模型中进行参数化来表示。国家大气研究社区地球系统模型v1.0.4当前使用的是间接参数化方案，湍流山应力方案（TMS）。在这项研究中，我们测试了一个称为BBW04的直接方案（Beljaars等人，QJR Meteorol Soc 130：1327-1347，2004。该方案已用于多个短期天气预报模型和地球系统模型中。结果表明，与没有子网格地形效果的模拟相比，间接方案和直接方案都增加了表面风应力并提高了模型在复杂地形上模拟低速风的性能，这表明TMS方案产生了更强烈的风速调节，从而BBW04方案的低层风速更适合ERA-Interim再分析，并且对复杂的地形更为敏感，它是直接方法；此外，TMS方案提高了2-m温度和热带和亚热带北半球大面积区域的行星边界层高度。

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  • 来源
    《Climate dynamics》 |2017年第10期|3365-3379|共15页
  • 作者

    Liang Yishuang; Wang Lanning; Zhang Guang Jun; Wu Qizhong;

  • 作者单位

    Beijing Normal Univ, Coll Global Change & Earth Syst Sci, Beijing 100875, Peoples R China|Joint Ctr Global Change Studies, Beijing 100875, Peoples R China;

    Beijing Normal Univ, Coll Global Change & Earth Syst Sci, Beijing 100875, Peoples R China|Joint Ctr Global Change Studies, Beijing 100875, Peoples R China;

    Scripps Inst Oceanog, La Jolla, CA 92093 USA|Tsinghua Univ, Ctr Earth Syst Sci, Beijing 100084, Peoples R China;

    Beijing Normal Univ, Coll Global Change & Earth Syst Sci, Beijing 100875, Peoples R China|Joint Ctr Global Change Studies, Beijing 100875, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Subgrid-scale; Turbulent form drag; Parameterization schemes; Community earth system model;

    机译：亚网格规模;湍流阻力;参数化方案;社区地球系统模型;

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