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Can Ningaloo Niño/Niña develop without El Niño-Southern oscillation?

Takahito Kataoka 1 Sébastien Masson 2 Takeshi Izumo 3 Tomoki Tozuka 4, 1 Toshio Yamagata 1
2 NEMO R&D - Nucleus for European Modeling of the Ocean
LOCEAN - Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques
3 PARVATI - Processus de la variabilité climatique tropicale et impacts
LOCEAN - Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques
Abstract : Ningaloo Niño/Niña is the dominant climate mode in the southeastern Indian Ocean with its center of positive/negative sea surface temperature anomalies attached to Australia. Ningaloo Niño is the major cause of marine heatwaves in the region. Although oceanic variability in this region has long been considered mainly as a response to the El Niño–Southern Oscillation (ENSO), some recent studies have suggested the possible existence of local air‐sea feedback processes. Using a state‐of‐the‐art ocean‐atmosphere coupled model that realistically simulates Ningaloo Niño/Niña, whether Ningaloo Niño/Niña can occur independently of ENSO is examined. Even in an experiment in which ENSO is suppressed by strongly nudging tropical Pacific sea surface temperatures toward the model climatology, Ningaloo Niño/Niña with a similar magnitude and seasonality still develops, likely through an air‐sea interaction off Western Australia amplifying atmospheric stochastic forcing. This study is the first to show that Ningaloo Niño/Niña can develop even without ENSO.
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Submitted on : Monday, November 29, 2021 - 1:16:53 PM
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2018GL078188.pdf
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Takahito Kataoka, Sébastien Masson, Takeshi Izumo, Tomoki Tozuka, Toshio Yamagata. Can Ningaloo Niño/Niña develop without El Niño-Southern oscillation?. Geophysical Research Letters, American Geophysical Union, 2018, 45 (14), pp.7040-7048. ⟨10.1029/2018GL078188⟩. ⟨hal-01874754⟩

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