Madden-Julian oscillation winds excite an intraseasonal see-saw of ocean mass that affects Earth’s polar motion

Type Article
Date 2021-12
Language English
Author(s) Afroosa M.1, 2, Rohith B.ORCID1, Paul AryaORCID1, Durand Fabien3, 4, Bourdallé-Badie Romain5, Sreedevi P. V.ORCID1, 6, de Viron Olivier7, Ballu ValérieORCID7, Shenoi S. S. C.1
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
Source Communications Earth & Environment (2662-4435) (Springer Science and Business Media LLC), 2021-12 , Vol. 2 , N. 1 , P. 139 (8p.)
DOI 10.1038/s43247-021-00210-x
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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Afroosa M., Rohith B., Paul Arya, Durand Fabien, Bourdallé-Badie Romain, Sreedevi P. V., de Viron Olivier, Ballu Valérie, Shenoi S. S. C. (2021). Madden-Julian oscillation winds excite an intraseasonal see-saw of ocean mass that affects Earth’s polar motion. Communications Earth & Environment, 2(1), 139 (8p.). Publisher's official version : https://doi.org/10.1038/s43247-021-00210-x , Open Access version : https://archimer.ifremer.fr/doc/00704/81645/