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  Convergence of daily GRACE solutions and models of sub‐monthly ocean bottom pressure variability

Schindelegger, M., Harker, A. A., Ponte, R. M., Dobslaw, H., Salstein, D. A. (2021): Convergence of daily GRACE solutions and models of sub‐monthly ocean bottom pressure variability. - Journal of Geophysical Research: Oceans, 126, 2, e2020JC017031.
https://doi.org/10.1029/2020JC017031

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Schindelegger, Michael1, Autor
Harker, Alexander A.1, Autor
Ponte, Rui M.1, Autor
Dobslaw, H.2, Autor              
Salstein, David A.1, Autor
Affiliations:
1External Organizations, ou_persistent22              
21.3 Earth System Modelling, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146027              

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Schlagwörter: OPEN ACCESS. Ocean bottom pressure; GRACE; time-variable gravity; Barotropic
 Zusammenfassung: Knowledge of sub‐monthly 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 sub‐monthly 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.

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 Datum: 2021-02-082021
 Publikationsstatus: Final veröffentlicht
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 Identifikatoren: DOI: 10.1029/2020JC017031
GFZPOF: p4 T2 Ocean and Cryosphere
OATYPE: Hybrid Open Access
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Titel: Journal of Geophysical Research: Oceans
Genre der Quelle: Zeitschrift, SCI, Scopus
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Seiten: - Band / Heft: 126 (2) Artikelnummer: e2020JC017031 Start- / Endseite: - Identifikator: ISSN: 2169-9275
ISSN: 2169-9291
CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/jgr_oceans
Publisher: American Geophysical Union (AGU)