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Mediterranean Surface Geostrophic Circulation from Satellite Gravity and Altimetry Observations

  • M. I. Vigo
  • M. D. Sempere
  • B. F. Chao
  • M. Trottini
Article
  • 76 Downloads

Abstract

We present a data-based approach to study the mean and the climatology of the surface geostrophic currents (SGC) for the Mediterranean Sea, using satellite ocean surface altimetry observations for 22 years (1993–2014) in conjunction with the geoid solution derived from the space mission of GOCE (gravity field and steady-state ocean circulation explorer; Release 4). The resultant product is the Mediterranean SGC velocity field, that we denote by SGC\(_{GOCE-Alt}\), given in spatial resolution of 1/4\({^\circ }\) and monthly time resolution. It exhibits smaller scales and lower dynamic intensities in comparison with open oceans, making the Mediterranean Sea a challenging test case for our satellite-based analysis. The mean SGC\(_{GOCE-Alt}\) is largely consistent with previous findings but with additional circulation features in time and space. We also compare our results with the SGC output from the regional hydrodynamic model of Mercator that assimilates satellite altimetry, satellite sea surface temperature, and in situ observations. The prominent SGC features agree well not only on the large and subbasin scales but also in the widespread mesoscale dynamics. We find, however, comparatively lower intensities than the Mercator model in general, with differences that are on average around 7 cm/s, but might reach 13 cm/s in some coastal areas.

Keywords

Surface geostrophic circulation mean dynamic topography gravity field and steady-state ocean circulation explorer (GOCE) Mediterranean Sea 

Notes

Acknowledgements

We thank the two anonymous reviewers whose constructive comments/suggestions helped improve and clarify this manuscript. We acknowledge the support of all data providers: ESA CCI Sea Level Project for the Altimetry data, DTU SPACE from the Danish National Space Center for MDT and MSS products, the surface currents from the Mercator Ocean Project, and LEGOS and CERSAT for the Ekman Surface Currents. The work is supported by Taiwan MoST Grant #105-2811-M-001-031. M. Dolores Sempere is supported by the PhD Grant UAFPU2014-5884 from the University of Alicante.

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • M. I. Vigo
    • 1
  • M. D. Sempere
    • 1
  • B. F. Chao
    • 2
  • M. Trottini
    • 3
  1. 1.Department Applied MathematicsUniversity of AlicanteAlicanteSpain
  2. 2.Institute of Earth Sciences, Academia SinicaTaipeiTaiwan, ROC
  3. 3.Department MathematicsUniversity of AlicanteAlicanteSpain

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