Madden-Julian oscillation winds excite an intraseasonal see-saw of ocean mass that affects Earth’s polar motion
| Type | Article | ||||||||||||||||||||||||
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| Date | 2021-07 | ||||||||||||||||||||||||
| Language | English | ||||||||||||||||||||||||
| Author(s) | Afroosa M.1, 2, Rohith B. 1, Paul Arya1, Durand Fabien3, 4, Bourdallé-Badie Romain5, Sreedevi P. V.1, 6, de Viron Olivier7, Ballu Valérie7, Shenoi S. S. C.1 |
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| Affiliation(s) | 1 : Indian National Centre for Ocean Information Services (INCOIS), Ministry of Earth Science (MoES), Hyderabad, India 2 : School of Ocean Sciences & Technology, Kerala University of Fisheries and Ocean Studies (KUFOS), Cochin, India 3 : LEGOS, Université de Toulouse, IRD, CNRS, CNES, UPS, Toulouse, France 4 : Laboratório de Geoquímica, Instituto de Geociencias, Universidade de Brasilia, Brasilia, Brazil 5 : Mercator Ocean International, Ramonville, France 6 : Cochin University of Science and Technology, Cochin, India 7 : LIENSs, La Rochelle, France |
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| Source | Communications Earth & Environment (2662-4435) (Springer Science and Business Media LLC), 2021-07 , Vol. 2 , N. 1 , P. 139 (8p.) | ||||||||||||||||||||||||
| DOI | 10.1038/s43247-021-00210-x | ||||||||||||||||||||||||
| WOS© Times Cited | 10 | ||||||||||||||||||||||||
| Abstract | Strong large-scale winds can relay their energy to the ocean bottom and elicit an almost immediate intraseasonal barotropic (depth independent) response in the ocean. The intense winds associated with the Madden-Julian Oscillation over the Maritime Continent generate significant intraseasonal basin-wide barotropic sea level variability in the tropical Indian Ocean. Here we show, using a numerical model and a network of in-situ bottom pressure recorders, that the concerted barotropic response of the Indian and the Pacific Ocean to these winds leads to an intraseasonal see-saw of oceanic mass in the Indo-Pacific basin. This global-scale mass shift is unexpectedly fast, as we show that the mass field of the entire Indo-Pacific basin is dynamically adjusted to Madden-Julian Oscillation in a few days. We find this large-scale ocean see-saw, induced by the Madden-Julian Oscillation, has a detectable influence on the Earth’s polar axis motion, in particular during the strong see-saw of early 2013. |
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