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arXiv 1604.05802physics.ao-ph
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海洋边界层混合K廓线参数化的校准。第一部分:发展

Calibration of the K-Profile Parameterization of ocean boundary layer mixing. Part I: Development

S. E. Zedler, C. S. Jackson, F. Yao, P. Heimbach, A. Kohl, R. B. Scott, I Hoteit

摘要:

在模型与观测数据的比较中,并非所有数据都包含有助于回答特定科学问题的信息。如果在比较指标中包含不相关或高度不确定的数据,它们可能会降低对相关科学过程重要的其他观察结果的重要性。噪声源和比较度量内的求和量之间的相关性影响对测试模型技能有用的信号的显著性。在热带太平洋的背景下,我们引入了一个模型数据比较的“查询依赖”(ID)度量,该度量确定了TOGA-TAO浮标观测海洋温度、盐度、2004年至2009年期间,由MIT大气环流模式(MITgcm)中嵌入的K剖面参数化(KPP)表示的影响上层海洋垂直湍流混合的水平海流。2007年时间段。ID度量解决了一个挑战,即风强迫可能是比湍流本身更重要的海洋状态不确定性来源,并且观测结果在时间,空间和海洋状态变量中相关。在这种方法中,MITgcm用于推断数据中和数据之间的变异性和关系,并确定与约束不确定参数最相关的响应结构。我们证明,ID度量是能够区分的影响,由于参数扰动,由于不确定的风,它是重要的,包括多种数据的比较,这表明ID度量是适当的使用在KPP模型参数的校准使用系泊观测的海洋状态。

英文摘要:

In model comparisons with observational data, not all data contain information that is useful for answering a specific science question. If non-relevant or highly uncertain data are included in a comparison metric, they can reduce the significance of other observations that matter for the scientific process of interest. Sources of noise and correlations among summed quantities within a comparison metric affect the significance of a signal that is useful for testing model skill. In the setting of the tropical Pacific, we introduce an "inquiry dependent" (ID) metric of model-data comparison that determines the relative importance of the TOGA-TAO buoy observations of the ocean temperature, salinity, and horizontal currents for influencing upper-ocean vertical turbulent mixing as represented by the K-Profile Parameterization (KPP) embedded in the MIT general circulation model (MITgcm) for the 2004-2007 time period. The ID metric addresses a challenge that the wind forcing is likely a more significant source of uncertainty for the ocean state than the turbulence itself, and that the observations are correlated in time, space, and across ocean state variables. In this approach the MITgcm is used to infer variability and relationships in and among the data, and to determine the response structures that are most relevant for constraining uncertain parameters. We demonstrate that the ID metric is able to distinguish the effects due to parameter perturbations from those due to uncertain winds and that it is important to include multiple kinds of data in the comparison, suggesting that the ID metric is appropriate for use in a calibration of the KPP model parameters using mooring observations of the ocean state.

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