Global mean surface temperature change over the past 120 years resembles a rising staircase1,2: the overall warming trend was interrupted by the mid-twentieth-century big hiatus and the warming slowdown2,3,4,5,6,7,8 since about 1998. The Interdecadal Pacific Oscillation9,10 has been implicated in modulations of global mean surface temperatures6,11, but which part of the mode drives the variability in warming rates is unclear. Here we present a successful simulation of the global warming staircase since 1900 with a global ocean–atmosphere coupled model where tropical Pacific sea surface temperatures are forced to follow the observed evolution. Without prescribed tropical Pacific variability, the same model, on average, produces a continual warming trend that accelerates after the 1960s. We identify four events where the tropical Pacific decadal cooling markedly slowed down the warming trend. Matching the observed spatial and seasonal fingerprints we identify the tropical Pacific as a key pacemaker of the warming staircase, with radiative forcing driving the overall warming trend. Specifically, tropical Pacific variability amplifies the first warming epoch of the 1910s–1940s and determines the timing when the big hiatus starts and ends. Our method of removing internal variability from the observed record can be used for real-time monitoring of anthropogenic warming.
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The authors are grateful to the Geophysical Fluid Dynamics Laboratory model developers for making the coupled model version 2.1 available. Y.K. is supported by the Japanese Ministry of Education, Culture, Sports, Science and Technology through Grant-in-Aid for Young Scientists 15H05466 and the Arctic Challenge for Sustainability (ArCS) Project, and by the Japanese Ministry of Environment through the Environment Research and Technology Development Fund 2-1503. S.-P.X. is supported by the US National Science Foundation and National Oceanic and Atmospheric Administration.
The authors declare no competing financial interests.
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Kosaka, Y., Xie, SP. The tropical Pacific as a key pacemaker of the variable rates of global warming. Nature Geosci 9, 669–673 (2016). https://doi.org/10.1038/ngeo2770
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