Basin-wide sea level coherency in the tropical Indian Ocean driven by Madden-Julian Oscillation
| Autor: | Fabien Durand, S. Prerna, Laurent Testut, Arya Paul, M. Afroosa, S. S. C. Shenoi, S. S. V. S. Ramakrishna, B. Rohith |
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| Přispěvatelé: | Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), LIttoral ENvironnement et Sociétés (LIENSs), La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Science Baroclinity General Physics and Astronomy Stratification (water) 02 engineering and technology Structural basin Article General Biochemistry Genetics and Molecular Biology 03 medical and health sciences Water column Barotropic fluid lcsh:Science Sea level Multidisciplinary Madden–Julian oscillation General Chemistry 021001 nanoscience & nanotechnology 030104 developmental biology Boreal [SDU]Sciences of the Universe [physics] Climatology lcsh:Q 0210 nano-technology Geology |
| Zdroj: | Nature Communications Nature Communications, 2019, 10, ⟨10.1038/s41467-019-09243-5⟩ Nature Communications, Vol 10, Iss 1, Pp 1-9 (2019) |
| ISSN: | 2041-1723 |
| Popis: | Changes in sea level may be attributed either to barotropic (involving the entire water column) or baroclinic processes (governed by stratification). It has been widely accepted that barotropic sea level changes in the tropics are insignificant at intraseasonal time scales (periods of 30–80 days). Based on bottom pressure records, we present evidence for significant basin-wide barotropic sea level variability in the tropical Indian Ocean during December–April with standard deviations amounting to ∼30–60% of the standard deviation in total intraseasonal sea level variability. The origin of this variability is linked to a small patch of wind over the Eastern Indian Ocean, associated with boreal winter Madden–Julian Oscillations (MJO). These large fluctuations are likely to play a prominent role in the intraseasonal sea level and mass budgets. Because of their much faster propagation than baroclinic processes, they allow the basin to adjust to climatic perturbations much more rapidly than was previously thought. The intraseasonal barotropic response of the ocean has been assumed to be negligible in tropical regions. We show that boreal winter MJOs, aided by ocean stratification, trigger a significant basin-wide barotropic sea level response in the tropical Indian Ocean at intraseasonal time scales. |
| Databáze: | OpenAIRE |
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