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What happens to the ocean surface gravity waves when ENSO and MJO phases combine during the extended boreal winter?

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Abstract

The safety of vulnerable coastal and offshore infrastructures requires an in-depth understanding of wave variability and climate drivers. We investigate the association of significant wave height (Hs) and peak wave period (Tp) with the co-occurrence of El Niño–Southern Oscillation (ENSO) and the Madden–Julian Oscillation (MJO) at the global scale. We calculate composites of daily anomalies in modelled Hs, Tp, and surface wind for periods of ENSO–MJO phase combinations. Calculations spanned November–March seasons over the period 1979–2018. Wave anomalies are widespread across the world’s oceans, with remarkable strength during several ENSO–MJO phase combinations, demonstrating strong tropic–tropic and tropic-extratropic teleconnections. Positive Hs anomalies are strongest in the Pacific Ocean during El Niño–MJO phase 8, in the Atlantic Ocean during ENSO-neutral-MJO phase 3, and in the Indian Ocean during ENSO-neutral-MJO phase 4. Positive Tp anomalies are strongest in the Pacific Ocean during La Niña–MJO phase 8, in the Atlantic Ocean during El Niño–MJO phase 1, and in the Indian Ocean during El Niño–MJO phase 8. In the Southern Ocean, the strongest Hs anomalies occur during El Niño–MJO phase 8, whereas in the Maritime Continent, they appear during ENSO-neutral-MJO phases 5–6. Despite previous studies finding low correlations of ENSO indices with wave parameters in the North Atlantic, our results suggest that ENSO-related conditions play a significant role in the area when combined with certain MJO-related conditions. This study also reveals that the wave anomalies associated with ENSO–MJO phase combinations can be twice as strong as those found in previous work, related only to the MJO. Therefore, considering multiple concurrent climate patterns in the analysis of wave anomalies is essential to developing more reliable coastal management plans.

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Acknowledgements

This research has been funded by the Brazilian National Council for Scientific and Technological Development (CNPq) [Grant Number 153284/2018-8]. The second author was funded by the UK Research and Innovation as part of the Global Challenges Research Fund, African SWIFT programme [Grant Number NE/P021077/1]. The authors are thankful to the two reviewers of this article, whose comments improved its earlier version, and also to CAWCR (hindcast data), BoM (RMM index), and NOAA (CFSR and CFSv2 winds and ONI) for data provision.

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Correspondence to Victor A. Godoi.

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Godoi, V.A., de Andrade, F.M., Durrant, T.H. et al. What happens to the ocean surface gravity waves when ENSO and MJO phases combine during the extended boreal winter?. Clim Dyn 54, 1407–1424 (2020). https://doi.org/10.1007/s00382-019-05065-9

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  • DOI: https://doi.org/10.1007/s00382-019-05065-9

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