Nineteenth and twentieth century sea-level changes in Tasmania and New Zealand

W.R. Gehrels, S.Louise Callard, Patrick T. Moss, William A. Marshall, Maarten Blaauw, John Hunter, J.Andrew Milton, Mark H. Garnett

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Abstract

Positive deviations from linear sea-level trends represent important climate signals if they are persistent and geographically widespread. This paper documents rapid sea-level rise reconstructed from sedimentary records obtained from salt marshes in the Southwest Pacific region (Tasmania and New Zealand). A new late Holocene relative sea-level record from eastern Tasmania was dated by AMS(14)C (conventional, high precision and bomb-spike), Cs-137, Pb-210, stable Pb isotopic ratios, trace metals, pollen and charcoal analyses. Palaeosea-level positions were determined by foraminiferal analyses. Relative sea level in Tasmania was within half a metre of present sea level for much of the last 6000 yr. Between 1900 and 1950 relative sea level rose at an average rate of 4.2 +/- 0.1 mm/yr. During the latter half of the 20th century the reconstructed rate of relative sea-level rise was 0.7 +/- 0.6 mm/yr. Our study is consistent with a similar pattern of relative sea-level change recently reconstructed for southern New Zealand. The change in the rate of sea-level rise in the SW Pacific during the early 20th century was larger than in the North Atlantic and could suggest that northern hemisphere land-based ice was the most significant melt source for global sea-level rise. (C) 2011 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)94-102
JournalEarth and planetary science letters
Volume315
Early online date05 Oct 2011
DOIs
Publication statusPublished - 15 Jan 2012

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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    Gehrels, W. R., Callard, S. L., Moss, P. T., Marshall, W. A., Blaauw, M., Hunter, J., Milton, J. A., & Garnett, M. H. (2012). Nineteenth and twentieth century sea-level changes in Tasmania and New Zealand. Earth and planetary science letters, 315, 94-102. https://doi.org/10.1016/j.epsl.2011.08.046