Uncertainty in future regional sea level rise due to internal climate variability

Authors

  • Aixue Hu,

    Corresponding author
    1. Climate and Global Dynamics Division, National Center for Atmospheric Research, Boulder, Colorado, USA
    • Corresponding author: A. Hu, National Center for Atmospheric Research, PO Box 3000, 1850 Table Mesa Drive, Boulder, CO, 80307–3000, USA. (ahu@ucar.edu)

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  • Clara Deser

    1. Climate and Global Dynamics Division, National Center for Atmospheric Research, Boulder, Colorado, USA
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Abstract

[1] Sea level rise (SLR) is an inescapable consequence of increasing greenhouse gas concentrations, with potentially harmful effects on human populations in coastal and island regions. Observational evidence indicates that global sea level has risen in the 20th century, and climate models project an acceleration of this trend in the coming decades. Here we analyze rates of future SLR on regional scales in a 40-member ensemble of climate change projections with the Community Climate System Model Version 3. This unique ensemble allows us to assess uncertainty in the magnitude of 21st century SLR due to internal climate variability alone. We find that simulated regional SLR at mid-century can vary by a factor of 2 depending on location, with the North Atlantic and Pacific showing the greatest range. This uncertainty in regional SLR results primarily from internal variations in the wind-driven and buoyancy-driven ocean circulations.

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