Contribution of oceanic wave propagation from the tropical Pacific to asymmetry of the Ningaloo Niño/Niña

Kusunoki, Hidehiro; Kido, Shoichiro; Tozuka, Tomoki

doi:10.1007/s00382-020-05268-5

Cited by 10 publications

(16 citation statements)

References 34 publications

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“…However, NNI is positive skewed in the observation, implying that Ningaloo Niño is typically stronger than Ningaloo Niña (Marshall et al., 2015; Tozuka & Oettli, 2018). The unexpected skewness may mean that an asymmetric impact on Ningaloo Niño/Niña from ENSO may exist (Kusunoki et al., 2020). Here, we examine this asymmetric impact in the observation and the selected CMIP5 models.…”

Section: Resultsmentioning

confidence: 99%

Weakened ENSO‐Ningaloo Niño/Niña Teleconnection Under Greenhouse Warming

Liu

Cai

et al. 2021

Geophysical Research Letters

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Ningaloo Niño/Niña is a mode of climate variability in the southeastern Indian Ocean with huge impacts on Australian climate. El Niño‐Southern Oscillation (ENSO), as the dominant remote forcing, triggers Ningaloo Niño/Niña. However, how this teleconnection will respond to greenhouse warming is unclear. Using Coupled Model Intercomparison Project phase 5 (CMIP5) multimodel simulations, we find a weakened ENSO‐Ningaloo Niño/Niña teleconnection under greenhouse warming, which manifests as weakened atmospheric teleconnection from La Niña to Ningaloo Niño. Such weakened teleconnection can be linked to the tropical Pacific mean state changes including an El Niño‐like warming pattern and more stable atmosphere in the future climate, both suppressing the atmospheric convection in the western tropical Pacific, leading to a weaker Matsuno‐Gill response in the southeastern Indian Ocean. Our results suggest that Ningaloo Niño/Niña becomes more challenging to predict as greenhouse warming continues.

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Section: Resultsmentioning

confidence: 99%

Weakened ENSO‐Ningaloo Niño/Niña Teleconnection Under Greenhouse Warming

Liu

Cai

et al. 2021

Geophysical Research Letters

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“…To identify what determines interdecadal SST anomalies in the Indian Ocean associated with the IPO, we also analyze outputs from a regional ocean model simulation by Kusunoki et al (2020). The model is based on the Regional Ocean Modeling System (ROMS; Shchepetkin & McWilliams, 2005), which has 0.25° × 0.25° horizontal resolution and 40 vertical sigma layers.…”

Section: Data and Modelsmentioning

confidence: 99%

“…This model is integrated for the period 1958-2014 following a 30-year spin-up under climatological forcing, and we analyze for 1960-2014. See Shchepetkin and McWilliams (2005) and Kido et al (2019) for more details about the model and Kusunoki et al (2020) for its validation in the southeastern Indian Ocean, particularly for the Ningaloo Niño (see Text S1). suggested that the recent shift to the negative phase of the IPO promoted more frequent occurrence of the Ningaloo Niño.…”

Section: Data and Modelsmentioning

confidence: 99%

Influences of the Interdecadal Pacific Oscillation on the Locally Amplified Ningaloo Niño

Tanuma

Tozuka

2020

Geophysical Research Letters

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Using observation/reanalysis data, influences of the Interdecadal Pacific Oscillation (IPO) on the frequency of the locally amplified Ningaloo Niño (i.e., events with local air‐sea interactions playing an important role) and their mechanisms are investigated in this study. It is found that the ratio of the locally amplified Ningaloo Niño increases during the negative phase of the IPO. This is due to positive interdecadal sea surface temperature anomalies to the northwest of Australia that promote deep atmospheric convection and anomalous cyclone off the west coast of Australia through a Matsuno‐Gill response. Based on a mixed layer heat budget analysis using outputs from a regional ocean model, it is shown that an enhanced warming of anomalously thin mixed layer by the shortwave radiation contributes dominantly to the interdecadal sea surface temperature anomalies. The shallow mixed layer depth is suggested to be generated by anomalously weak winds associated with the negative IPO.

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“…In the locally amplified mode, warm SST anomalies produce low sea level pressure (SLP) anomalies, triggering northerly wind anomalies that cause downwelling anomalies and further increase warming. The nonlocally amplified case mostly co‐occurs during La Niña conditions in the Pacific Ocean, which forces positive sea surface height (SSH) and SST anomalies in the tropics, then the SSH anomalies, along with warmer SSTs, propagate south through coastally trapped waves (Kataoka et al, 2014; Kusunoki et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Drivers of the 2013 Marine Heatwave on the North West Shelf of Australia

et al. 2021

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A marine heatwave (MHW) occurs when ocean temperatures are warmer than a local threshold for an extended period of time (Hobday et al., 2016). This can occur off the coast of western Australia because of abnormal warming of the ocean surface driven by a Ningaloo Niño, the dominant climate variability mode in the southeastern Indian Ocean. In the austral summer of 2012/2013 a particularly strong MHW developed on Australia's North West Shelf (NWS) region (Figure 1), beginning in December 2012 and peaking in February 2013 (Feng et al., 2015; Xu et al., 2018). This MHW resulted in warm sea surface temperature (SST) anomalies during January and February of over 3°C that were mostly confined northeast of the North West Cape (NWC, Figure 1) in the southwestern region of the NWS (Xu et al., 2018). The MHW caused coral bleaching and other significant ecological impacts (Feng et al., 2015; Xu et al., 2018), stressing the importance of understanding the driving mechanisms behind the evolution of this strong MHW event. Ningaloo Niño, a key driver of MHWs in the region, usually starts to develop in September-October and peaks off the west Australian coast in the middle of the Australian summer in

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Contribution of oceanic wave propagation from the tropical Pacific to asymmetry of the Ningaloo Niño/Niña

Cited by 10 publications

References 34 publications

Weakened ENSO‐Ningaloo Niño/Niña Teleconnection Under Greenhouse Warming

Weakened ENSO‐Ningaloo Niño/Niña Teleconnection Under Greenhouse Warming

Influences of the Interdecadal Pacific Oscillation on the Locally Amplified Ningaloo Niño

Hydrodynamic Drivers of the 2013 Marine Heatwave on the North West Shelf of Australia

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