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The climate change commitment.

T M L Wigley1

  • 1National Center for Atmospheric Research, Boulder, CO 80307, USA. wigley@cgd.ucar.edu

Science (New York, N.Y.)
|March 19, 2005
PubMed
Summary
This summary is machine-generated.

Even with fixed atmospheric composition, global temperatures and sea levels will continue to rise due to oceanic thermal inertia. Avoiding future climate change requires significant emissions reductions.

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Area of Science:

  • Climate Science
  • Oceanography
  • Atmospheric Science

Background:

  • Oceanic thermal inertia causes continued global warming and sea level rise even if atmospheric composition is stabilized.
  • Understanding these committed changes is crucial for accurate climate projections and policy-making.

Purpose of the Study:

  • To quantify the committed global-mean temperature and sea level rise under constant-composition (CC) and constant-emissions (CE) scenarios.
  • To assess the uncertainties associated with these climate change commitments.

Main Methods:

  • Quantification of constant-composition (CC) warming and sea level rise commitments.
  • Consideration of constant-emissions (CE) warming and sea level rise commitments.
  • Analysis of uncertainties in projected committed climate changes.

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Main Results:

  • The CC warming commitment could exceed 1°C.
  • The CE warming commitment is projected to be between 2°C and 6°C by 2400.
  • CC sea level rise commitment is approximately 10 cm/century (1-30 cm/century range), while CE commitment is 25 cm/century (7-50 cm/century range).

Conclusions:

  • Significant future warming and sea level rise are committed even with immediate stabilization of atmospheric composition.
  • Substantial reductions in emissions below current levels are necessary to mitigate these committed changes.
  • Avoiding long-term sea level rise may be impossible, underscoring the urgency of climate action.