Knowledge of submonthly variability in ocean bottom pressure (p_b) is an essential element in space‐geodetic analyses and global gravity field research. Estimates of these mass changes are typically drawn from numerical ocean models and, more recently, GRACE (Gravity Recovery and Climate Experiment) series at daily sampling. However, the quality of p_b fields from either source has been difficult to assess and reservations persist as to the dependence of regularized GRACE solutions on their oceanographic priors. Here, we make headway on the subject by comparing two daily satellite gravimetry products (years 2007–2009) both with each other and with p_b output from a diverse mix of ocean models, complemented by insights from bottom pressure gauges. Emphasis is given to large spatial scales and periods <60 days. Satellite‐based mass changes are in good agreement over basin interiors and point to excess p_b signals (∼2 cm root‐mean‐square error) over Southern Ocean abyssal plains in the present GRACE de‐aliasing model. These and other imperfections in baroclinic models are especially apparent at periods <10 days, although none of the GRACE series presents a realistic ground truth on time scales of a few days. A barotropic model simulation with parameterized topographic wave drag is most commensurate with the GRACE fields over the entire submonthly band, allowing for first‐order inferences about error and noise in the gravimetric mass changes. Estimated p_b errors vary with signal magnitude and location but are generally low enough (0.5–1.5 cm) to judge model skill in dynamically active regions.

中文翻译：

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每日GRACE解决方案的收敛性和每个月底海底压力变化的模型

对月底海底压力（p _b）的每月变化的了解是空间大地分析和全球重力场研究的基本要素。这些质量变化的估计值通常是从数值海洋模型以及最近的GRACE（重力恢复和气候实验）系列中每天进行采样得出的。但是，很难评估来自这两个来源的p _b场的质量，并且对正规化GRACE解决方案对其海洋先验的依赖仍然存在保留意见。在这里，我们通过比较两个每日的卫星重力测量产品（2007-2009年）和相互比较的p _b取得了进展。海洋模型的多种混合的输出，以及底部压力计的见解的补充。重点是大的空间尺度和小于60天的时期。基于卫星的质量变化与盆地内部的变化非常吻合，并指出了过量的p _b在目前的GRACE去混叠模型中，南大洋深海平原上的信号（均方根误差约为2厘米）。斜压模型中的这些和其他缺陷在<10天的时期内尤其明显，尽管GRACE系列都没有在几天的时间尺度上提出现实的事实。带有参数化地形波阻力的正压模型模拟与整个子月波段内的GRACE场最相称，可以对重量质量变化中的误差和噪声进行一阶推断。估计的p _b误差随信号幅度和位置而变化，但通常足够低（0.5–1.5 cm）以判断动态活动区域中的模型技巧。