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Ocean Surface Geostrophic Circulation Climatology and Annual Variations Inferred from Satellite Altimetry and GOCE Gravity Data

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Abstract

We have studied, for the first time, variations in absolute surface geostrophic currents (SGC) using satellite data only. The proposed approach combines 18 years’ altimetry data, which provide reliable measurements of absolute sea level (ASL), with a gravity field and steady-state ocean circulation explorer geoid model to obtain dynamic topography, and achieves unprecedented precision and accuracy. Our proposal overcomes the main limitations of existing approaches based solely on altimetry data (which suffer from lack of an independent reference for derivation of ASL maps), and approximations based on in-situ data (which are characterized by a sparse and inhomogeneous coverage in time and space). Features of annual variations of SGC are also addressed. As a result of our study we provide new absolute SGC climatology in the form of a 52-week data set of surface current fields, gridded at quarter degree longitude and latitude resolution and resolving spatial scales as short as 140 km. For presentation, this data set is averaged monthly and the results, presented as monthly climatology, are compared with climatology based on in-situ observations from drifter data.

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Authors and Affiliations

  1. Department of Applied Mathematics, University of Alicante, Alicante, Spain

    J. M. Sánchez-Reales & M. I. Vigo

  2. Department of Statistics and Operational Research, University of Alicante, Alicante, Spain

    M. Trottini

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  1. J. M. Sánchez-Reales
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  2. M. I. Vigo
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  3. M. Trottini
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Correspondence to M. I. Vigo.

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Sánchez-Reales, J.M., Vigo, M.I. & Trottini, M. Ocean Surface Geostrophic Circulation Climatology and Annual Variations Inferred from Satellite Altimetry and GOCE Gravity Data. Pure Appl. Geophys. 173, 849–860 (2016). https://doi.org/10.1007/s00024-014-0981-x

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  • DOI: https://doi.org/10.1007/s00024-014-0981-x

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