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AGU: Geophysical Research Letters

 

Keywords

  • sea-level change
  • vertical land motion
  • tide gauge records

Index Terms

  • Geodesy and Gravity: Ocean monitoring with geodetic techniques
  • Oceanography: Physical: Sea level: variations and mean
  • Global Change: Sea level change
  • Geodesy and Gravity: Control surveys

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 36, L12607, 6 PP., 2009
doi:10.1029/2009GL038720

Rates of sea-level change over the past century in a geocentric reference frame

G. Wöppelmann

LIENSS, UMR6250, Université de La Rochelle, La Rochelle, France

C. Letetrel

LIENSS, UMR6250, Université de La Rochelle, La Rochelle, France

A. Santamaria

Instituto Geográfico Nacional, Madrid, Spain

LAREG/IGN et GRGS, Marne-la-Vallée, France

M.-N. Bouin

LAREG/IGN et GRGS, Marne-la-Vallée, France

Météo-France, CMM, CNRM, Brest, France

X. Collilieux

LAREG/IGN et GRGS, Marne-la-Vallée, France

Z. Altamimi

LAREG/IGN et GRGS, Marne-la-Vallée, France

S. D. P. Williams

Proudman Oceanographic Laboratory, Liverpool, UK

B. Martin Miguez

Intergovernmental Oceanographic Commission of UNESCO, Paris, France

The results from a carefully implemented GPS analysis, using a strategy adapted to determine accurate vertical station velocities, are presented. The stochastic properties of our globally distributed GPS position time series were inferred, allowing the computation of reliable velocity uncertainties. Most uncertainties were several times smaller than the 1–3 mm/yr global sea level change, and hence the vertical velocities could be applied to correct the long tide gauge records for land motion. The sea level trends obtained in the ITRF2005 reference frame are more consistent than in the ITRF2000 or corrected for Glacial-Isostatic Adjustment (GIA) model predictions, both on the global and the regional scale, leading to a reconciled global rate of geocentric sea level rise of 1.61 ± 0.19mm/yr over the past century in good agreement with the most recent estimates.

Received 15 April 2009; accepted 21 May 2009; published 24 June 2009.

Citation: Wöppelmann, G., C. Letetrel, A. Santamaria, M.-N. Bouin, X. Collilieux, Z. Altamimi, S. D. P. Williams, and B. M. Miguez (2009), Rates of sea-level change over the past century in a geocentric reference frame, Geophys. Res. Lett., 36, L12607, doi:10.1029/2009GL038720.

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