Show simple item record

dc.contributor.authorGangiredla, S.
dc.contributor.authorAmol, P.
dc.contributor.authorMukherjee, A.
dc.date.accessioned2024-10-16
dc.date.accessioned2024-10-16T09:59:33Z
dc.date.available2024-10-16
dc.date.available2024-10-16T09:59:33Z
dc.date.issued2024
dc.identifier.citationClimate Dynmics, vol.62(8);2024; 7111�7125
dc.identifier.issn1432-0894
dc.identifier.otherhttps://link.springer.com/article/10.1007/s00382-024-07268-1#citeas
dc.identifier.urihttps://doi.org/10.1007/s00382-024-07268-1
dc.identifier.urihttp://drs.nio.res.in/drs/handle/2264/9314
dc.descriptionIF2023= 3.8
dc.description.abstractThis study examines direct current measurements in the central equatorial Indian Ocean during the positive phase of the extreme Indian Ocean Dipole (pIOD) in 2019. Analysis of near-surface zonal current at 77E and 83E reveals a notable delay in the onset of fall Wyrtki Jets (WJs), typically occurring in October. The WJs formed in December but persisted for a shorter duration. On the other hand, the subsurface currents display a strong eastward flow persistent from October 2019 to June 2020 which is abnormal to a normal condition. The anomalous subsurface zonal currents exhibited magnitudes three times stronger during pIOD 2019 compared to pIOD composites. Due to the continued sub-surface flow, wavelet analysis revealed a dominant semi-annual cycle near the surface and an annual cycle in the subsurface layers. To explore the underlying processes behind these anomalies, we used the Modular Ocean Model in conjunction with a linear, continuously stratified model. Our experiments revealed that the weakening of fall Wyrtki Jets in 2019 was driven by anomalous easterlies associated with the extreme pIOD phase. However, the persistence of eastward subsurface currents was attributed to anomalous westerlies in the western Indian Ocean. These westerlies generated Kelvin waves propagating eastward, which upon impinging the eastern boundary, reflected and propagated downwards as Rossby waves, ultimately intensifying the subsurface currents. Overall, our study underscores the significance of equatorial wave dynamics in driving currents during the extreme IOD event.
dc.languageen
dc.publisherSpringer
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.titleInfluence of the extreme Indian Ocean dipole 2019 on the equatorial Indian Ocean circulation.
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


Files in this item

Thumbnail
Thumbnail

This item appears in the following Collection(s)

Show simple item record