Madden-Julian oscillation winds excite an intraseasonal see-saw of ocean mass that affects Earth’s polar motion - Archive ouverte HAL Access content directly
Journal Articles Communications Earth & Environment Year : 2021

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

M. Afroosa
  • Function : Author
B. Rohith
Arya Paul
Fabien Durand
  • Function : Author
Romain Bourdallé-Badie
  • Function : Author
P. Sreedevi
Olivier de Viron
  • Function : Author
Valérie Ballu
S. Shenoi
  • Function : Author

Abstract

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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Dates and versions

hal-03431792 , version 1 (07-08-2022)

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Attribution - CC BY 4.0

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M. Afroosa, B. Rohith, Arya Paul, Fabien Durand, Romain Bourdallé-Badie, et al.. Madden-Julian oscillation winds excite an intraseasonal see-saw of ocean mass that affects Earth’s polar motion. Communications Earth & Environment, 2021, 2 (1), ⟨10.1038/s43247-021-00210-x⟩. ⟨hal-03431792⟩

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