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Basin-wide sea level coherency in the tropical Indian Ocean driven by Madden–Julian Oscillation

Rohit, B and Paul, A and Durand, F and Testut, L and Prerna, S and Afroosa, M and Ramakrishnaa, SSVS and Shenoi, SSC (2019) Basin-wide sea level coherency in the tropical Indian Ocean driven by Madden–Julian Oscillation. Nature Communications, 10. p. 1257.

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Abstract

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.

Item Type: Article
Additional Information: This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder
Uncontrolled Keywords: Basin-wide sea level coherency;tropical Indian Ocean; Madden–Julian Oscillation;
Subjects: Meteorology and Climatology
Oceanography > oceanography
Depositing User: INCOIS Library
Date Deposited: 19 Mar 2019 10:38
Last Modified: 19 Mar 2019 10:38
URI: http://moeseprints.incois.gov.in/id/eprint/4625

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