Reconstructing Upper Ocean Vertical Velocity Field from Sea Surface Height in the Presence of Unbalanced Motion

Type Article
Date 2020-01
Language English
Author(s) Qiu Bo1, Chen Shuiming1, Klein Patrice2, 3, Torres Hector2, Wang Jinbo2, Fu Lee-Lueng2, Menemenlis Dimitris2
Affiliation(s) 1 : Department of Oceanography, University of Hawaii at Manoa, Honolulu, Hawaii, USA
2 : Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
3 : Université de Brest, CNRS, IRD, Ifremer, LOPS, Plouzané, France
Source Journal Of Physical Oceanography (0022-3670) (American Meteorological Society), 2020-01 , Vol. 50 , N. 1 , P. 55-79
DOI 10.1175/JPO-D-19-0172.1
WOS© Times Cited 8
Keyword(s) Eddies, Mesoscale processes, Ocean dynamics, Vertical motion, Altimetry
Abstract

Reconstructability of upper ocean vertical velocity (w) and vorticity (ζ) fields from high-resolution sea surface height (SSH) data is explored using the global 1/48° horizontal-resolution MITgcm output in the context of the forth-coming Surface Water and Ocean Topography (SWOT) mission. By decomposing w with an omega equation of the primitive-equation system and by taking into account the measurement design of the SWOT mission, this study seeks to reconstruct the subinertial, balanced w and ζ signals. By adopting the effective surface quasi-geostrophic (eSQG) framework and applying to the Kuroshio Extension region of the North Pacific, we find that the target and reconstructed fields have a spatial correlation of ~0.7 below the mixed layer for w and 0.7 ~ 0.9 throughout the 1000m upper ocean for ζ in the error-free scenario. By taking the SWOT sampling and measurement errors into account, the spatial correlation is found to decrease to 0.4 ~ 0.6 below the mixed layer for w and 0.6 ~ 0.7 for ζ, respectively. For both w and ζ reconstruction, the degradation due to the SWOT errors is more significant in the surface layer and for smaller-scale signals. The impact of errors lessens with the increasing depth and lengthening horizontal scales.

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Qiu Bo, Chen Shuiming, Klein Patrice, Torres Hector, Wang Jinbo, Fu Lee-Lueng, Menemenlis Dimitris (2020). Reconstructing Upper Ocean Vertical Velocity Field from Sea Surface Height in the Presence of Unbalanced Motion. Journal Of Physical Oceanography, 50(1), 55-79. Publisher's official version : https://doi.org/10.1175/JPO-D-19-0172.1 , Open Access version : https://archimer.ifremer.fr/doc/00593/70561/