Sustainability Science

, Volume 3, Issue 1, pp 9–22

Understanding global sea levels: past, present and future

Authors

    • Centre for Australian Weather and Climate Research—A Partnership Between CSIRO and the Australian Bureau of Meteorology and CSIROCSIRO Marine and Atmospheric Research
    • Antarctic Climate and Ecosystems Cooperative Research Centre
  • Neil J. White
    • Centre for Australian Weather and Climate Research—A Partnership Between CSIRO and the Australian Bureau of Meteorology and CSIROCSIRO Marine and Atmospheric Research
    • Antarctic Climate and Ecosystems Cooperative Research Centre
  • Thorkild Aarup
    • Intergovernmental Oceanographic CommissionUNESCO
  • W. Stanley Wilson
    • U.S. National Oceanic and Atmospheric Administration (NOAA)
  • Philip L. Woodworth
    • Permanent Service for Mean Sea LevelProudman Oceanographic Laboratory
  • Catia M. Domingues
    • Centre for Australian Weather and Climate Research—A Partnership Between CSIRO and the Australian Bureau of Meteorology and CSIROCSIRO Marine and Atmospheric Research
  • John R. Hunter
    • Antarctic Climate and Ecosystems Cooperative Research Centre
  • Kurt Lambeck
    • Antarctic Climate and Ecosystems Cooperative Research Centre
    • Research School of Earth SciencesAustralian National University
Special Feature: Original Article

DOI: 10.1007/s11625-008-0042-4

Cite this article as:
Church, J.A., White, N.J., Aarup, T. et al. Sustain Sci (2008) 3: 9. doi:10.1007/s11625-008-0042-4

Abstract

The coastal zone has changed profoundly during the 20th century and, as a result, society is becoming increasingly vulnerable to the impact of sea-level rise and variability. This demands improved understanding to facilitate appropriate planning to minimise potential losses. With this in mind, the World Climate Research Programme organised a workshop (held in June 2006) to document current understanding and to identify research and observations required to reduce current uncertainties associated with sea-level rise and variability. While sea levels have varied by over 120 m during glacial/interglacial cycles, there has been little net rise over the past several millennia until the 19th century and early 20th century, when geological and tide-gauge data indicate an increase in the rate of sea-level rise. Recent satellite-altimeter data and tide-gauge data have indicated that sea levels are now rising at over 3 mm year−1. The major contributions to 20th and 21st century sea-level rise are thought to be a result of ocean thermal expansion and the melting of glaciers and ice caps. Ice sheets are thought to have been a minor contributor to 20th century sea-level rise, but are potentially the largest contributor in the longer term. Sea levels are currently rising at the upper limit of the projections of the Third Assessment Report of the Intergovernmental Panel on Climate Change (TAR IPCC), and there is increasing concern of potentially large ice-sheet contributions during the 21st century and beyond, particularly if greenhouse gas emissions continue unabated. A suite of ongoing satellite and in situ observational activities need to be sustained and new activities supported. To the extent that we are able to sustain these observations, research programmes utilising the resulting data should be able to significantly improve our understanding and narrow projections of future sea-level rise and variability.

Keywords

Sea-level riseClimate changeCoastsExtreme eventsIPCCGreenhouse

Abbreviations

CryoSat-2

Second cryospheric satellite

GCOS

Global climate observing system

GFO

GeoSat follow-on satellite

GLONASS

Global orbiting navigation satellite system

GLOSS

Global sea-level observing system

GNSS

Global navigation satellite system

GOCE

Gravity field and steady-state ocean circulation explorer satellite

GPS

Global positioning system

GRACE

Gravity recovery and climate experiment satellite

ICESat

Ice, cloud and land elevation satellite

InSAR

Interferometric synthetic aperture radar

SLR

Satellite laser ranging

Copyright information

© Integrated Research System for Sustainability Science and Springer 2008