A Method for Interpreting the Role of Parameterized Turbulence on Global Metrics in the Community Earth System Model

IF 4.4 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES
Kyle M. Nardi, Colin M. Zarzycki, Vincent E. Larson
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引用次数: 0

Abstract

The parameterization of subgrid-scale processes such as boundary layer (PBL) turbulence introduces uncertainty in Earth System Model (ESM) results. This uncertainty can contribute to or exacerbate existing biases in representing key physical processes. This study analyzes the influence of tunable parameters in an experimental version of the Cloud Layers Unified by Binormals (CLUBBX) scheme. CLUBB is the operational PBL parameterization in the Community Atmosphere Model version 6 (CAM6), the atmospheric component of the Community ESM version 2 (CESM2). We perform the Morris one-at-a-time (MOAT) parameter sensitivity analysis using short-term (3-day), initialized hindcasts of CAM6-CLUBBX with 24 unique initial conditions. Several input parameters modulating vertical momentum flux appear most influential for various regionally-averaged quantities, namely surface stress and shortwave cloud forcing (SWCF). These parameter sensitivities have a spatial dependence, with parameters governing momentum flux most influential in regions of high vertical wind shear (e.g., the mid-latitude storm tracks). We next evaluate several experimental 20-year simulations of CAM6-CLUBBX with targeted parameter perturbations. We find that parameter perturbations produce similar physical mechanisms in both short-term and long-term simulations, but these physical responses can be muted due to nonlinear feedbacks manifesting over time scales longer than 3 days, thus causing differences in how output metrics respond in the long-term simulations. Analysis of turbulent fluxes in CLUBBX indicates that the influential parameters affect vertical fluxes of heat, moisture, and momentum, providing physical pathways for the sensitivities identified in this study.

Abstract Image

解释参数化湍流对群落地球系统模型全球指标的作用的方法
边界层(PBL)湍流等亚网格尺度过程的参数化会给地球系统模式(ESM)结果带来不确定性。这种不确定性会导致或加剧在表示关键物理过程时的现有偏差。本研究分析了可调参数在实验版云层统一二项式(CLUBBX)方案中的影响。CLUBB 是共同体大气模式第 6 版(CAM6)中的运行 PBL 参数化,是共同体 ESM 第 2 版(CESM2)的大气组成部分。我们使用具有 24 个独特初始条件的 CAM6-CLUBBX 的短期(3 天)初始化后报,进行了莫里斯一次参数(MOAT)敏感性分析。一些调节垂直动量通量的输入参数似乎对各种区域平均量影响最大,即表面应力和短波云强迫(SWCF)。这些参数的敏感性具有空间依赖性,在高垂直风切变区域(如中纬度风暴轨迹),影响动量通量的参数影响最大。接下来,我们对 CAM6-CLUBBX 20 年模拟进行了评估,并对参数进行了有针对性的扰动。我们发现,参数扰动在短期和长期模拟中产生了类似的物理机制,但由于非线性反馈在超过 3 天的时间尺度上表现出来,这些物理响应可能会被削弱,从而导致长期模拟中输出指标响应的差异。对 CLUBBX 中湍流通量的分析表明,有影响的参数会影响热量、湿度和动量的垂直通量,为本研究确定的敏感性提供了物理途径。
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来源期刊
Journal of Advances in Modeling Earth Systems
Journal of Advances in Modeling Earth Systems METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
11.40
自引率
11.80%
发文量
241
审稿时长
>12 weeks
期刊介绍: The Journal of Advances in Modeling Earth Systems (JAMES) is committed to advancing the science of Earth systems modeling by offering high-quality scientific research through online availability and open access licensing. JAMES invites authors and readers from the international Earth systems modeling community. Open access. Articles are available free of charge for everyone with Internet access to view and download. Formal peer review. Supplemental material, such as code samples, images, and visualizations, is published at no additional charge. No additional charge for color figures. Modest page charges to cover production costs. Articles published in high-quality full text PDF, HTML, and XML. Internal and external reference linking, DOI registration, and forward linking via CrossRef.
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