Distinct intraseasonal oscillation modes over the tropical Indo-Pacific oceans

Yiran Li; Haibo Hu; Fei Liu; Matthew Patterson; Xiu-Qun Yang; Kecheng Lu; Kefeng Mao; Ziyi Wang; Rongrong Wang

doi:10.1029/2024GL113263

Distinct intraseasonal oscillation modes over the tropical Indo-Pacific oceans

Yiran Li, Haibo Hu^*, Fei Liu, Matthew Patterson, Xiu-Qun Yang, Kecheng Lu, Kefeng Mao, Ziyi Wang, Rongrong Wang

^*Corresponding author for this work

School of Earth & Environmental Sciences

Research output: Contribution to journal › Article › peer-review

Abstract

In boreal winter, the Madden-Julian Oscillation (MJO) is the dominant mode of tropical intraseasonal oscillation (ISO), which bridges weather and climate. In addition to the dominant eastward propagating MJO mode, this study identifies the existence of the westward propagating and stationary oscillating ISO modes according to the spatio-temporal evolution of large-scale precipitation. At the pentad timescale, each ISO mode tends to suppress the occurrence of the other two. The diagnostic of column-integrated moist static energy (MSE) tendency anomalies reveals the dominant contribution from horizontal MSE advection to each ISO mode. Synthesis results indicate that vertical zonal wind shear anomalies exhibit opposite distributions between the propagating and stationary oscillating ISO events over the tropical Indo-Pacific Oceans. Subsequent simulations prove that the easterly (westerly) wind shear anomalies could suppress the eastward (westward) propagating convection of the ISO, thus favoring a stationary oscillating ISO.

Original language	English
Article number	e2024GL113263
Number of pages	11
Journal	Geophysical Research Letters
Volume	52
Issue number	9
Early online date	8 May 2025
DOIs	https://doi.org/10.1029/2024GL113263
Publication status	Published - 16 May 2025

Access to Document

10.1029/2024GL113263Licence: CC BY

Li_2025_GRL_Distinct-intraseasonal-oscillation-modes-Indo-Pacific-oceans_CC
© 2025. The Author(s). This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Final published version, 4.74 MBLicence: CC BY

Cite this

@article{3d499f15c6ff460b94e4924728aa9aa2,

title = "Distinct intraseasonal oscillation modes over the tropical Indo-Pacific oceans",

abstract = "In boreal winter, the Madden-Julian Oscillation (MJO) is the dominant mode of tropical intraseasonal oscillation (ISO), which bridges weather and climate. In addition to the dominant eastward propagating MJO mode, this study identifies the existence of the westward propagating and stationary oscillating ISO modes according to the spatio-temporal evolution of large-scale precipitation. At the pentad timescale, each ISO mode tends to suppress the occurrence of the other two. The diagnostic of column-integrated moist static energy (MSE) tendency anomalies reveals the dominant contribution from horizontal MSE advection to each ISO mode. Synthesis results indicate that vertical zonal wind shear anomalies exhibit opposite distributions between the propagating and stationary oscillating ISO events over the tropical Indo-Pacific Oceans. Subsequent simulations prove that the easterly (westerly) wind shear anomalies could suppress the eastward (westward) propagating convection of the ISO, thus favoring a stationary oscillating ISO.",

author = "Yiran Li and Haibo Hu and Fei Liu and Matthew Patterson and Xiu-Qun Yang and Kecheng Lu and Kefeng Mao and Ziyi Wang and Rongrong Wang",

note = "Funding: This work was supported by the National Key Program for Developing Basic Science (Grants 2022YFF0801702 and 2022YFE0106600), the National Natural Science Foundation of China (Grants 42175060 and 42175021), the Jiangsu Province Science Foundation (Grant BK20250200302). The authors are thankful for the support of the Jiangsu Provincial Innovation Center for Climate Change.",

year = "2025",

month = may,

day = "16",

doi = "10.1029/2024GL113263",

language = "English",

volume = "52",

journal = "Geophysical Research Letters",

issn = "0094-8276",

publisher = "John Wiley & Sons, Ltd",

number = "9",

}

TY - JOUR

T1 - Distinct intraseasonal oscillation modes over the tropical Indo-Pacific oceans

AU - Li, Yiran

AU - Hu, Haibo

AU - Liu, Fei

AU - Patterson, Matthew

AU - Yang, Xiu-Qun

AU - Lu, Kecheng

AU - Mao, Kefeng

AU - Wang, Ziyi

AU - Wang, Rongrong

N1 - Funding: This work was supported by the National Key Program for Developing Basic Science (Grants 2022YFF0801702 and 2022YFE0106600), the National Natural Science Foundation of China (Grants 42175060 and 42175021), the Jiangsu Province Science Foundation (Grant BK20250200302). The authors are thankful for the support of the Jiangsu Provincial Innovation Center for Climate Change.

PY - 2025/5/16

Y1 - 2025/5/16

N2 - In boreal winter, the Madden-Julian Oscillation (MJO) is the dominant mode of tropical intraseasonal oscillation (ISO), which bridges weather and climate. In addition to the dominant eastward propagating MJO mode, this study identifies the existence of the westward propagating and stationary oscillating ISO modes according to the spatio-temporal evolution of large-scale precipitation. At the pentad timescale, each ISO mode tends to suppress the occurrence of the other two. The diagnostic of column-integrated moist static energy (MSE) tendency anomalies reveals the dominant contribution from horizontal MSE advection to each ISO mode. Synthesis results indicate that vertical zonal wind shear anomalies exhibit opposite distributions between the propagating and stationary oscillating ISO events over the tropical Indo-Pacific Oceans. Subsequent simulations prove that the easterly (westerly) wind shear anomalies could suppress the eastward (westward) propagating convection of the ISO, thus favoring a stationary oscillating ISO.

AB - In boreal winter, the Madden-Julian Oscillation (MJO) is the dominant mode of tropical intraseasonal oscillation (ISO), which bridges weather and climate. In addition to the dominant eastward propagating MJO mode, this study identifies the existence of the westward propagating and stationary oscillating ISO modes according to the spatio-temporal evolution of large-scale precipitation. At the pentad timescale, each ISO mode tends to suppress the occurrence of the other two. The diagnostic of column-integrated moist static energy (MSE) tendency anomalies reveals the dominant contribution from horizontal MSE advection to each ISO mode. Synthesis results indicate that vertical zonal wind shear anomalies exhibit opposite distributions between the propagating and stationary oscillating ISO events over the tropical Indo-Pacific Oceans. Subsequent simulations prove that the easterly (westerly) wind shear anomalies could suppress the eastward (westward) propagating convection of the ISO, thus favoring a stationary oscillating ISO.

U2 - 10.1029/2024GL113263

DO - 10.1029/2024GL113263

M3 - Article

SN - 0094-8276

VL - 52

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 9

M1 - e2024GL113263

ER -

Distinct intraseasonal oscillation modes over the tropical Indo-Pacific oceans

Abstract

Access to Document

Fingerprint

Cite this