气候变化领域集成服务门户(CCPortal): Convergence of Daily GRACE Solutions and Models of Submonthly Ocean Bottom Pressure Variability

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DOI	10.1029/2020JC017031
	Convergence of Daily GRACE Solutions and Models of Submonthly Ocean Bottom Pressure Variability
	Schindelegger M.; Harker A.A.; Ponte R.M.; Dobslaw H.; Salstein D.A.
发表日期	2021
ISSN	21699275
卷号	126 期号:2
英文摘要	Knowledge of submonthly variability in ocean bottom pressure (pb) 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 pb 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 pb 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 pb 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 pb 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. © 2021. The Authors.
英文关键词	barotropic; GRACE; ocean bottom pressure; time-variable gravity
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186487
作者单位	Institute of Geodesy and Geoinformation, University of Bonn, Bonn, Germany; Atmospheric and Environmental Research, Inc., Lexington, MA, United States; Department 1: Geodesy, GFZ German Research Centre for Geosciences, Potsdam, Germany
推荐引用方式 GB/T 7714	Schindelegger M.,Harker A.A.,Ponte R.M.,et al. Convergence of Daily GRACE Solutions and Models of Submonthly Ocean Bottom Pressure Variability[J],2021,126(2).
APA	Schindelegger M.,Harker A.A.,Ponte R.M.,Dobslaw H.,&Salstein D.A..(2021).Convergence of Daily GRACE Solutions and Models of Submonthly Ocean Bottom Pressure Variability.Journal of Geophysical Research: Oceans,126(2).
MLA	Schindelegger M.,et al."Convergence of Daily GRACE Solutions and Models of Submonthly Ocean Bottom Pressure Variability".Journal of Geophysical Research: Oceans 126.2(2021).