Regional sea level changes projected by the NASA/GISS Atmosphere-Ocean Model

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Article          

       
Climate Dynamics
Publisher: Springer-Verlag Heidelberg
ISSN: 0930-7575 (Paper) 1432-0894 (Online)
DOI: 10.1007/s003820000090
Issue: Volume 16, Numbers 10-11
Date:  October 2000
Pages: 789 - 797
Regional sea level changes projected by the NASA/GISS Atmosphere-Ocean Model

G. L. Russell A1, V. Gornitz A1, J. R. Miller A1

A1 NASA/Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025, USA E-mail: grussell@giss.nasa.gov

Abstract:

Abstract Sea level has been rising for the past century, and coastal residents of the Earth will want to understand and predict future sea level changes. In this study we present sea level changes from new simulations of the Goddard Institute for Space Studies (GISS) global atmosphere-ocean model from 1950 to 2099. The free surface, mass conserving ocean model leads to a straightforward calculation of these changes. Using observed levels of greenhouse gases between 1950 and 1990 and a compounded 0.5% annual increase in CO2 after 1990, model projections show that global sea level measured from 1950 will rise by 61 mm in the year 2000, by 212 mm in 2050, and by 408 mm in 2089. By 2089, 64% of the global sea level rise will be due to thermal expansion and 36% will be due to ocean mass changes. The Arctic Ocean will show a greater than average sea level rise, while the Antarctic circumpolar region will show a smaller rise in agreement with other models. Model results are also compared with observed sea level changes during the past 40 years at 12 coastal stations around the world.