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Joint modulation of intraseasonal rainfall in tropical Australia by the Madden-Julian Oscillation and El Niño-Southern Oscillation

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Ghelani, RPS, Oliver, ECJ ORCID: 0000-0002-4006-2826, Holbrook, NJ ORCID: 0000-0002-3523-6254, Wheeler, MC and Klotzbach, PJ 2017 , 'Joint modulation of intraseasonal rainfall in tropical Australia by the Madden-Julian Oscillation and El Niño-Southern Oscillation' , Geophysical Research Letters, vol. 44, no. 20 , 10,754-10,761 , doi: 10.1002/2017GL075452.

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Abstract

Rainfall in tropical Australia is a critical resource for the agricultural sector. However, its high variability implores improvements in our understanding of its variability. Australian tropical rainfall is influenced by both the Madden-Julian Oscillation (MJO) on intraseasonal time scales and El Niño-Southern Oscillation (ENSO) on interannual time scales. This study examines the joint relationship between the MJO, ENSO, and tropical Australian rainfall variability. We analyze daily precipitation data from stations across tropical Australia during the wet season (November to April). The wet season rainfall response to the MJO is found to be greater during El Niño than La Niña. We demonstrate that this relationship is not due to the statistical relationship between the MJO and ENSO indices but instead due to differences in how the MJO modulates the large-scale circulation during El Niño versus during La Niña.

Item Type: Article
Authors/Creators:Ghelani, RPS and Oliver, ECJ and Holbrook, NJ and Wheeler, MC and Klotzbach, PJ
Keywords: enso, mjo, predictability, intraseasonal rainfall, tropics, Australia, Madden-Julian oscillation, El Nino-Southern Oscillation, El Nino, wet season
Journal or Publication Title: Geophysical Research Letters
Publisher: Amer Geophysical Union
ISSN: 0094-8276
DOI / ID Number: 10.1002/2017GL075452
Copyright Information:

© 2017. American Geophysical Union

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