dc.contributor.author | Wang, Hui | |
dc.contributor.author | Kumar, Arun | |
dc.contributor.author | Narapusetty, Balachandrudu | |
dc.contributor.author | Seip, Knut Lehre | |
dc.date.accessioned | 2019-07-22T20:57:35Z | |
dc.date.accessioned | 2019-09-06T09:24:47Z | |
dc.date.available | 2019-07-22T20:57:35Z | |
dc.date.available | 2019-09-06T09:24:47Z | |
dc.date.issued | 2019-07-11 | |
dc.identifier.citation | Wang H, Kumar A, Narapusetty, Seip KL. Covariations between the Indian Oceandipole and ENSO: a modeling study. Climate Dynamics. 2019 | en |
dc.identifier.issn | 0930-7575 | |
dc.identifier.issn | 0930-7575 | |
dc.identifier.issn | 1432-0894 | |
dc.identifier.uri | https://hdl.handle.net/10642/7499 | |
dc.description.abstract | The coevolution of the Indian Ocean dipole (IOD) and El Niño-Southern Oscillation (ENSO) is examined using both observational data and coupled global climate model simulations. The covariability of IOD and ENSO is analyzed by applying
the extended empirical orthogonal function (EEOF) method to the surface and subsurface ocean temperatures in the tropical
Indian Ocean and western Pacifc. The frst EEOF mode shows the evolution of IOD that lags ENSO, whereas the second
mode exhibits the transition from a dipole mode to a basin-wide mode in the tropical Indian Ocean that leads ENSO. The
lead-lag relationships between IOD and ENSO are consistent with two-way interactions between them. A comparison between
two 500-year model simulations with and without ENSO shows that ENSO can enhance the variability of IOD at interannual
time scale. The infuence of ENSO on the IOD intensity is larger for the eastern pole than for the western pole, and further,
is stronger in the negative IOD phase than in the positive phase. The infuence of IOD on ENSO is demonstrated by the
improvement of ENSO prediction using sea surface temperature (SST) in the tropical Indian Ocean as an ENSO precursor.
The improvement of the ENSO forecast skill is found at both a short lead time (0 month) and long leads (10–15 months).
The SST in the western pole has more predictive value than in the eastern pole. The eastward propagation of surface and
subsurface temperature signals from the western Indian Ocean that precedes the development of heat content anomaly in the
tropical western Pacifc is the key for extending the lead time for ENSO prediction. Our results are consistent with previously
reported fndings but highlight the spatial–temporal evolution of the ENSO-IOD system. It is also illustrated that IOD would
have been more helpful in predicting the 1997/98 El Niño than the 2015/16 El Niño. | en |
dc.language.iso | en | en |
dc.publisher | Springer | en |
dc.relation.ispartofseries | Climate Dynamics;November 2019, Volume 53, Issue 9–10 | |
dc.rights | This is a post-peer-review, pre-copyedit version of an article published in Climate Dynamics.
The final authenticated version is available online at: https://dx.doi.org/10.1007/s00382-019-04895-x | en |
dc.subject | Indian ocean dipole | en |
dc.subject | El Niño-southern sscillation | en |
dc.subject | Climate modeling | en |
dc.title | Covariations between the Indian Oceandipole and ENSO: a modeling study | en |
dc.type | Journal article | en |
dc.type | Peer reviewed | en |
dc.date.updated | 2019-07-22T20:57:35Z | |
dc.description.version | acceptedVersion | en |
dc.identifier.doi | https://dx.doi.org/10.1007/s00382-019-04895-x | |
dc.identifier.cristin | 1712375 | |
dc.source.journal | Climate Dynamics | |