Future Projections of the El Niño—Southern Oscillation and Tropical Pacific Mean State in CMIP6

Erickson, Nathan E.; Patricola, Christina M.

doi:10.1029/2022JD037563

Title: Future Projections of the El Niño—Southern Oscillation and Tropical Pacific Mean State in CMIP6

Journal Article · Thu Nov 16 00:00:00 EST 2023 · Journal of Geophysical Research: Atmospheres

DOI:https://doi.org/10.1029/2022JD037563· OSTI ID:2204447

Erickson, Nathan E. ^[1];

^[2]

Department of Geological and Atmospheric Sciences Iowa State University Ames IA USA
Department of Geological and Atmospheric Sciences Iowa State University Ames IA USA, Lawrence Berkeley National Laboratory Climate and Ecosystem Sciences Division Berkeley CA USA

Abstract The El Niño—Southern Oscillation (ENSO) is an important mode of tropical Pacific atmosphere‐ocean variability that drives teleconnections with weather and climate globally. However, prior studies using state‐of‐the‐art climate models lack consensus regarding future ENSO projections and are often impacted by tropical Pacific sea‐surface temperature (SST) biases. We used 173 simulations from 29 climate models participating in the Coupled Model Intercomparison Project, version 6 (CMIP6) to analyze model biases and future ENSO projections. We analyzed two ENSO indices, namely the ENSO Longitude Index (ELI), which measures zonal shifts in tropical Pacific deep convection and accounts for changes in background SST, and the Niño 3.4 index, which measures SST anomalies in the central‐eastern equatorial Pacific. We found that the warm eastern tropical‐subtropical Pacific SST bias typical of previous generations of climate models persists into many of the CMIP6 models. Future projections of ENSO shift toward more El Niño‐like conditions based on ELI in 48% of simulations and 55% of models, in association with a future weakening of the zonal equatorial Pacific SST gradient. On the other hand, none of the models project a significant shift toward La Niña‐like conditions. The standard deviation of the Niño 3.4 index indicates a lack of consensus on whether an increase or decrease in ENSO variability is expected in the future. Finally, we found a possible relationship between historical SST and low‐level cloud cover biases in the ENSO region and future changes in ELI; however, this result may be impacted by limitations in data availability.

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Sponsoring Organization:: USDOE

OSTI ID:: 2204447

Alternate ID(s):: OSTI ID: 2204448

Journal Information:: Journal of Geophysical Research: Atmospheres, Journal Name: Journal of Geophysical Research: Atmospheres Vol. 128 Journal Issue: 21; ISSN 2169-897X

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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