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- Title
Emergence of changing Central-Pacific and Eastern-Pacific El Niño-Southern Oscillation in a warming climate.
- Authors
Geng, Tao; Cai, Wenju; Wu, Lixin; Santoso, Agus; Wang, Guojian; Jing, Zhao; Gan, Bolan; Yang, Yun; Li, Shujun; Wang, Shengpeng; Chen, Zhaohui; McPhaden, Michael J.
- Abstract
El Niño-Southern Oscillation (ENSO) features strong warm events in the eastern equatorial Pacific (EP), or mild warm and strong cold events in the central Pacific (CP), with distinct impacts on global climates. Under transient greenhouse warming, models project increased sea surface temperature (SST) variability of both ENSO regimes, but the timing of emergence out of internal variability remains unknown for either regime. Here we find increased EP-ENSO SST variability emerging by around 2030 ± 6, more than a decade earlier than that of CP-ENSO, and approximately four decades earlier than that previously suggested without separating the two regimes. The earlier EP-ENSO emergence results from a stronger increase in EP-ENSO rainfall response, which boosts the signal of increased SST variability, and is enhanced by ENSO non-linear atmospheric feedback. Thus, increased ENSO SST variability under greenhouse warming is likely to emerge first in the eastern than central Pacific, and decades earlier than previously anticipated. Under global warming, increased variability in El Niño sea surface temperature was projected to be detectable by about 2070. Here the authors show that the increased variability of a type of more impactful El Niño events is likely detectable by 2030.
- Subjects
EL Nino; OCEAN temperature; SOUTHERN oscillation; GLOBAL warming
- Publication
Nature Communications, 2022, Vol 13, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-022-33930-5