Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 40, Issue 12, Pages 3175-3179Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/grl.50541
Keywords
climate hiatus; ocean heat uptake; GCM; surface temperature; energy budget
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Funding
- Program for Risk Information on Climate Change (SOUSEI project)
- MEXT, Japan [23310014, 23340137]
- Grants-in-Aid for Scientific Research [23340137, 23310014] Funding Source: KAKEN
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The rate of increase of global-mean surface air temperature (SAT(g)) has apparently slowed during the last decade. We investigated the extent to which state-of-the-art general circulation models (GCMs) can capture this hiatus period by using multimodel ensembles of historical climate simulations. While the SAT(g) linear trend for the last decade is not captured by their ensemble means regardless of differences in model generation and external forcing, it is barely represented by an 11-member ensemble of a GCM, suggesting an internal origin of the hiatus associated with active heat uptake by the oceans. Besides, we found opposite changes in ocean heat uptake efficiency (), weakening in models and strengthening in nature, which explain why the models tend to overestimate the SAT(g) trend. The weakening of commonly found in GCMs seems to be an inevitable response of the climate system to global warming, suggesting the recovery from hiatus in coming decades.
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