Madden-Julian oscillation winds excite an intraseasonal see-saw of ocean mass that affects Earth’s polar motion
| Autor: | Fabien Durand, Olivier de Viron, M. Afroosa, Arya Paul, Romain Bourdallé-Badie, S. S. C. Shenoi, Valérie Ballu, P. V. Sreedevi, B. Rohith |
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| Přispěvatelé: | LIttoral ENvironnement et Sociétés - UMRi 7266 (LIENSs), Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Angular momentum
010504 meteorology & atmospheric sciences Oscillation Lead (sea ice) Madden–Julian oscillation 010502 geochemistry & geophysics 01 natural sciences 13. Climate action Climatology Barotropic fluid Polar motion [SDE]Environmental Sciences General Earth and Planetary Sciences Polar 14. Life underwater Geology Sea level 0105 earth and related environmental sciences General Environmental Science |
| Zdroj: | Communications Earth & Environment (2662-4435) (Springer Science and Business Media LLC), 2021-07, Vol. 2, N. 1, P. 139 (8p.) Communications Earth & Environment Communications Earth & Environment, Springer Nature, 2021, 2 (1), ⟨10.1038/s43247-021-00210-x⟩ |
| ISSN: | 2662-4435 |
| Popis: | 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. Intense winds over the Maritime Continent associated with the Madden-Julian Oscillation lead to a large-scale redistribution of oceanic mass in the Indo-Pacific basins, and have a noticeable impact on the Earth’s angular momentum. |
| Databáze: | OpenAIRE |
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