A novel method to test non-exclusive hypotheses applied to Arctic ice projections from dependent models

R. Olson, Soon-Il An, Y. Fan, W. Chang, J. P. Evans, J. Y. Lee

Research output: Contribution to journalArticle

Abstract

A major conundrum in climate science is how to account for dependence between climate models. This complicates interpretation of probabilistic projections derived from such models. Here we show that this problem can be addressed using a novel method to test multiple non-exclusive hypotheses, and to make predictions under such hypotheses. We apply the method to probabilistically estimate the level of global warming needed for a September ice-free Arctic, using an ensemble of historical and representative concentration pathway 8.5 emissions scenario climate model runs. We show that not accounting for model dependence can lead to biased projections. Incorporating more constraints on models may minimize the impact of neglecting model non-exclusivity. Most likely, September Arctic sea ice will effectively disappear at between approximately 2 and 2.5 K of global warming. Yet, limiting the warming to 1.5 K under the Paris agreement may not be sufficient to prevent the ice-free Arctic.

Original languageEnglish
Article number3016
JournalNature communications
Volume10
Issue number1
DOIs
Publication statusPublished - 2019 Dec 1

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Ice
Climate
Global Warming
ice
projection
Climate models
global warming
climate models
Global warming
Ice Cover
Paris
Sea ice
sea ice
climate
heating
estimates
predictions

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Olson, R. ; An, Soon-Il ; Fan, Y. ; Chang, W. ; Evans, J. P. ; Lee, J. Y. / A novel method to test non-exclusive hypotheses applied to Arctic ice projections from dependent models. In: Nature communications. 2019 ; Vol. 10, No. 1.
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A novel method to test non-exclusive hypotheses applied to Arctic ice projections from dependent models. / Olson, R.; An, Soon-Il; Fan, Y.; Chang, W.; Evans, J. P.; Lee, J. Y.

In: Nature communications, Vol. 10, No. 1, 3016, 01.12.2019.

Research output: Contribution to journalArticle

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