The Effect of Indian Ocean Temperature on the Pacific Trade Winds and ENSO

Ferster, Brady S.; Fedorov, Alexey V.; Guilyardi, Eric; Mignot, Juliette

doi:10.1029/2023gl103230

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The Effect of Indian Ocean Temperature on the Pacific Trade Winds and ENSO

2023
By Ferster, Brady S. ; Fedorov, Alexey V. ; Guilyardi, Eric ; ...
Source: Geophysical Research Letters, 50(20)

[PDF-3.59 MB]

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Details:

Journal Title:

Geophysical Research Letters
Personal Author:

Ferster, Brady S. ; Fedorov, Alexey V. ; Guilyardi, Eric ; Mignot, Juliette

Ferster, Brady S. ; Fedorov, Alexey V. ; Guilyardi, Eric ; Mignot, Juliette Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; PSL (Physical Sciences Laboratory)

OAR (Oceanic and Atmospheric Research) ; PSL (Physical Sciences Laboratory) Less -
Description:

A notable shift in the El Niño‐Southern Oscillation (ENSO) has been observed in the early 21st century, characterized by an increased prevalence of Central Pacific (CP) events and strengthened Pacific trade winds. This shift may be attributed to the warming tropical Indian Ocean (TIO). To investigate this, we conduct perturbation experiments using the Insitut Pierre Simon Laplace climate model and nudge TIO surface temperatures to induce warming or cooling effects. Our findings reveal that TIO warming (or cooling) leads to amplified (weakened) mean trade winds and surface warming (cooling) in the Pacific region. Surprisingly, ENSO variability increases in both TIO cooling and warming scenarios. This result is linked to stronger positive feedbacks and a less stable Bjerknes index for either TIO forcing. Additionally, we find that TIO warming leads to more frequent CP events, meridional widening of wind anomalies, and broadening of the ENSO power spectrum toward lower frequencies.
Keywords:

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General Earth And Planetary Sciences Geophysics
Source:

Geophysical Research Letters, 50(20)
DOI:

https://doi.org/10.1029/2023gl103230
ISSN:

0094-8276;1944-8007;
Format:

PDF
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
Funding:

Grant no. NA20OAR4310377
License:

https://creativecommons.org/licenses/by/4.0/
Rights Information:

CC BY
Compliance:

Library
Main Document Checksum:

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urn:sha256:fdbd2ae342eabb23d68c5dc773353db3201c21b1a01d3fcccc249b838704c6b8
Download URL:

https://repository.library.noaa.gov/view/noaa/58105/noaa_58105_DS1.pdf
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