Characteristics and triggering mechanisms of early negative Indian Ocean Dipole

Yue Fang; Shuangwen Sun; Yongcan Zu; Jianhu Wang; Lin Feng

doi:10.1007/s13131-023-2294-y

Volume 43 Issue 3

Mar. 2024

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Yue Fang, Shuangwen Sun, Yongcan Zu, Jianhu Wang, Lin Feng. Characteristics and triggering mechanisms of early negative Indian Ocean Dipole[J]. Acta Oceanologica Sinica, 2024, 43(3): 59-65. doi: 10.1007/s13131-023-2294-y

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Yue Fang, Shuangwen Sun, Yongcan Zu, Jianhu Wang, Lin Feng. Characteristics and triggering mechanisms of early negative Indian Ocean Dipole[J]. Acta Oceanologica Sinica, 2024, 43(3): 59-65. doi: 10.1007/s13131-023-2294-y

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Characteristics and triggering mechanisms of early negative Indian Ocean Dipole

doi: 10.1007/s13131-023-2294-y

Yue Fang^{1, 2, 3
,
,},
Shuangwen Sun^{1, 2, 3},
Yongcan Zu^{1, 2, 3},
Jianhu Wang^{1, 3},
Lin Feng^{1, 2, 3}

1.
First Institute of Oceanography, and Key Laboratory of Marine Science and Numerical Modeling, Ministry of Natural Resources, Qingdao 266061, China
2.
Laboratory for Regional Oceanography and Numerical Modeling, Qingdao Marine Science and Technology Center, Qingdao 266237, China
3.
Shandong Key Laboratory of Marine Science and Numerical Modeling, Qingdao 266061, China

Funds: The Basic Scientific Fund for National Public Research Institutes of China under contract No. 2022S02; the National Natural Science Foundation of China under contract No. 41976021.

More Information

Corresponding author: E-mail: yfang@fio.org.cn
Received Date: 2023-09-21
Accepted Date: 2023-12-14

Available Online: 2024-03-14

Publish Date: 2024-03-25

Abstract

Abstract

Negative Indian Ocean Dipole (nIOD) can exert great impacts on global climate and can also strongly influence the climate in China. Early nIOD is a major type of nIOD, which can induce more pronounced climate anomalies in summer than La Niña-related nIOD. However, the characteristics and triggering mechanisms of early nIOD are unclear. Our results based on reanalysis datasets indicate that the early nIOD and La Niña-related nIOD are the two major types of nIOD, and the former accounts for over one third of all the nIOD events in the past six decades. These two types of nIODs are similar in their intensities, but are different in their spatial patterns and seasonal cycles. The early nIOD, which develops in spring and peaks in summer, is one season earlier than the La Niña-related nIOD. The spatial pattern of the wind anomaly associated with early nIOD exhibits a winter monsoon-like pattern, with strong westerly anomalies in the equatorial Indian Ocean and eastly anomalies in the northern Indian Ocean. Opposite to the triggering mechanism of early positve IOD, the early nIOD is induced by delayed Indian summer monsoon onset. The results of this study are helpful for improving the prediction skill of IOD and its climate impacts.
- Indian Ocean Dipole (IOD),
- triggering mechanism,
- Indian summer monsoon,
- seasonal cycle,
- negative IOD

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References(28)

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