Higher trends but larger uncertainty and geographic variability in 21st century temperature and heat waves

Auroop R. Ganguly, Karsten Steinhaeuser, David J. Erickson, Marcia Branstetter, Esther S. Parish, Nagendra Singh, John B. Drake, Lawrence Buja

Research output: Contribution to journalArticlepeer-review

102 Scopus citations

Abstract

Generating credible climate change and extremes projections remains a high-priority challenge, especially since recent observed emissions are above the worst-case scenario. Bias and uncertainty analyses of ensemble simulations from a global earth systems model show increased warming and more intense heat waves combined with greater uncertainty and large regional variability in the 21st century. Global warming trends are statistically validated across ensembles and investigated at regional scales. Observed heat wave intensities in the current decade are larger than worst-case projections. Model projections are relatively insensitive to initial conditions, while uncertainty bounds obtained by comparison with recent observations are wider than ensemble ranges. Increased trends in temperature and heat waves, concurrent with larger uncertainty and variability, suggest greater urgency and complexity of adaptation or mitigation decisions.

Original languageEnglish
Pages (from-to)15555-15559
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume106
Issue number37
DOIs
StatePublished - Sep 15 2009

Keywords

  • Climate change
  • Extremes
  • Regional analysis

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