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dc.contributor.authorSadhvi, K.
dc.contributor.authorSuresh, I.
dc.contributor.authorLengaigne, M.
dc.contributor.authorIzumo, T.
dc.contributor.authorPenduff, T.
dc.contributor.authorMolines, J.-M.
dc.contributor.authorCan, A.A.
dc.contributor.authorVialard, J.
dc.date.accessioned2024-03-31
dc.date.accessioned2024-09-13T06:18:57Z
dc.date.available2024-02-23
dc.date.available2024-09-13T06:18:57Z
dc.date.issued2024
dc.identifier.citationJournal of Geophysical Research: Oceans, vol.129(2); 2024; Article no: e2023JC020077
dc.identifier.issn2169-9291
dc.identifier.otherhttps://onlinelibrary.wiley.com/doi/full/10.1029/2023JC020077
dc.identifier.urihttps://doi.org/10.1029/2023JC020077
dc.identifier.urihttp://drs.nio.res.in/drs/handle/2264/9247
dc.descriptionIF(JCR2023) = 3.6
dc.description.abstractThe Great Whirl (GW) is a quasi-permanent anticyclonic eddy that appears every summer monsoon offshore of the Somalia upwelling. The annual cycle of the GW is well described, but deviations from its mean seasonal cycle (hereafter non-seasonal variability) have been less explored. Satellite observations reveal that the leading mode of summer non-seasonal sea-level variability in this region is associated with ?100-km northward or southward GW shifts from its climatological position. Northward shifts are associated with a stronger GW, and two cold, productive coastal upwelling wedges at 5�N and 10�N. Southward shifts are associated with a weaker GW, no wedge at 5�N and a single stronger-than-usual cold and productive wedge at 10�N. An eddy-permitting (25-km resolution) 50-member ensemble ocean simulation reproduces this GW variability well. It indicates that the non-seasonal GW variability has a short ?20 days timescale intrinsic component, associated with the GW interaction with mesoscale eddies, and a lower-frequency, ?100 days externally forced component. Intrinsic variability dominates at both subseasonal (two thirds of the variance) and interannual timescales (57% of the variance). The externally forced signal results from shifts in the probability distribution of the subseasonal GW position (e.g., more likely northward than southward shifted instantaneous GW positions over a season). The mechanism for this external forcing is not entirely clear, but it appears to be related to the Rossby wave response to offshore wind stress curl forcing, which evolves into a north-south dipole that projects onto the GW variability pattern.
dc.languageen
dc.publisherJohn Wiley & Sons, Ltd
dc.relation.isreferencedbySCI
dc.rightsOnly the author version of the copright reserved papers uploaded. Contact drs@nio.org for any complaints regarding copyright violations
dc.titleIntrinsic versus wind-forced great whirl non-seasonal variability
dc.typeJournal Article
dc.affiliation.authorGoa University, Taleigao, India


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