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Weather noise leading to El Niño diversity in an ocean general circulation model

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An Erratum to this article was published on 29 March 2017

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Abstract

The frequency of Central Pacific (CP) El Niño occurrences has increased since the late 1990s. In spite of a wealth of studies, however, the physical mechanisms that have caused the change remain unclear. We hypothesize that atmospheric weather noise plays a role in these occurrences. To test this hypothesis, we conduct four simulations using Modular Ocean Model version 4 (MOM4) forced by atmospheric weather noise. In this study, the atmospheric weather noise is defined as the random noise obtained from the European Centre for Medium-Range Weather Forecasts atmospheric datasets. In the first experiment, MOM4 is forced by atmospheric weather noise before 1999 along with the corresponding climatological mean state. In the second experiment, MOM4 is forced by atmospheric weather noise after 1999 along with the corresponding climatological mean state. The third and fourth experiments are similar to the first two experiments except the time periods of the climatological mean state are switched. The results show that atmospheric weather noise may play a more important role than the climatological mean state in the increase of CP El Niño occurrences. This implies that the El Niño diversity could be caused by the modulation of atmospheric weather noise. Therefore, it is important to explore how the atmospheric weather noise might change in light of global warming.

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    Authors and Affiliations

    1. Department of Marine Sciences and Convergent Technology, Hanyang University, ERICA, Ansan, Republic of Korea

      Jong-Won Lee, Sang-Wook Yeh & Hyun-Su Jo

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    1. Jong-Won Lee
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    2. Sang-Wook Yeh
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    3. Hyun-Su Jo
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    Correspondence to Sang-Wook Yeh.

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    This paper is a contribution to the special collection on ENSO Diversity. The special collection aims at improving understanding of the origin, evolution, and impacts of ENSO events that differ in amplitude and spatial patterns, in both observational and modeling contexts, and in the current as well as future climate scenarios. This special collection is coordinated by Antonietta Capotondi, Eric Guilyardi, Ben Kirtman and Sang-Wook Yeh.

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    Lee, JW., Yeh, SW. & Jo, HS. Weather noise leading to El Niño diversity in an ocean general circulation model. Clim Dyn 52, 7235–7247 (2019). https://doi.org/10.1007/s00382-016-3438-3

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    • DOI: https://doi.org/10.1007/s00382-016-3438-3

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