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Deep-Ocean Tides in the South-West Indian Ocean: Comparing Deep-Sea Pressure to Satellite Data

  • Leo R. M. Maas
  • Borja Aguiar-González
  • Leandro Ponsoni
Chapter
Part of the Springer Oceanography book series (SPRINGEROCEAN)

Abstract

Deep ocean pressure measurements in two regions of the South-West Indian Ocean (West and East of Madagascar), covering one to two years of data, are analysed for tidal motions. The pressure data are taken both from Bottom Pressure Recorders as well as from mid-water column instruments. Coherent tides are characterised by fixed amplitudes and phases. Those inferred from bottom measurements compare well to tides obtained from satellite altimetry, and cover up to 99\(\%\) of the pressure variance in the frequency band having periods shorter than 29 h. Long-period tides, in the low-frequency band, are regularly overshadowed by (unwanted) eddy-induced mooring motion (‘blow-down’), which events have therefore been eliminated. In the Mozambique Channel, semidiurnal surface tides are stronger than East of Madagascar, and all appear to be near resonance with a basin mode. Away from the bottom, coherent internal tides were determined. Evidence of the presence of incoherent internal tides has been obtained by applying Harmonic Analyses over a moving time window of 1 year duration. East of Madagascar internal tides appear to be very strong, although its source remains unclear.

Notes

Acknowledgements

This work is dedicated to Eugene Morozov on the occasion of his seventieth birthday. The authors are thankful to Gary Egbert, Lana Erofeeva and Oregon State University for providing the altimetry-derived barotropic tides and to the Royal Netherlands Institute for Sea Research for providing the pressure data. Pressure data were collected in the INATEX program, ‘INdian-ATlantic EXchange in present and past climate’, funded by the Netherlands Organization for Scientific Research (NWO), section Earth and Life Sciences (ALW), through its ZKO Grant 839.08.43. The authors acknowledge Commonwealth Scientific and Industrial Research Organisation (CSIRO) for making available the Atlas of Regional Seas 2009 (CARS2009).

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • Leo R. M. Maas
    • 1
    • 2
  • Borja Aguiar-González
    • 3
  • Leandro Ponsoni
    • 4
  1. 1.Institute for Marine and Atmospheric Research Utrecht, Utrecht UniversityUtrechtThe Netherlands
  2. 2.NIOZ Royal Netherlands Institute for Sea ResearchTexelThe Netherlands
  3. 3.Department of Ocean Systems SciencesNIOZ Royal Netherlands Institute for Sea Research, Utrecht UniversityDen Burg, TexelThe Netherlands
  4. 4.Georges Lemaître Centre for Earth and Climate Research (TECLIM), Earth and Life Institute, Université catholique de LouvainLouvain-la-NeuveBelgium

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