Multidecadal variability in the transmission of ENSO signals to the Indian Ocean
Article
Article Title | Multidecadal variability in the transmission of ENSO signals to the Indian Ocean |
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ERA Journal ID | 1874 |
Article Category | Article |
Authors | Shi, G. (Author), Ribbe, J. (Author), Cai, W. (Author) and Cowan, T. (Author) |
Journal Title | Geophysical Research Letters |
Journal Citation | 34 (9), p. L09706 |
Number of Pages | 6 |
Year | 2007 |
Publisher | John Wiley & Sons |
Place of Publication | United States |
ISSN | 0094-8276 |
1944-8007 | |
Digital Object Identifier (DOI) | https://doi.org/10.1029/2007GL029528 |
Web Address (URL) | https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2007GL029528 |
Abstract | Since 1980, transmission of El Nino-Southern Oscillation (ENSO) signals into the Indian Ocean involves an equatorial, and a subtropical North Pacific (NP) Rossby wave pathway. We examine the robustness of the amount of energy that leaves the Pacific via each of the pathway using the Simple Ocean Data Assimilation with the Parallel Ocean Program (SODA-POP) reanalysis and a multi-century coupled model control experiment. We find that in the pre-1980 period, little ENSO signal is transmitted to the Indian Ocean and does not involve the subtropical NP pathway. Such multidecadal variability is periodically produced by the climate model. Examinations reveal that when ENSO is weak as determined by Nino3.4, their meridional extent is narrow, the associated discharge-recharge does not involve the subtropical NP pathway; further, weak ENSO events have a low signal-to-noise ratio, making the transmission hard to detect. The dynamics of multidecadal variability in ENSO strength awaits further investigation. |
Keywords | global climate change; climate variability; climate dynamics; atmospheric circulation; ocean circulation; El Nino Southern Oscillation; Indian Ocean; decadal ocean variability; Pacific Ocean; ocean model |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 370201. Climate change processes |
370904. Palaeoclimatology | |
370202. Climatology | |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | Department of Biological and Physical Sciences |
Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australia |
https://research.usq.edu.au/item/9y2xz/multidecadal-variability-in-the-transmission-of-enso-signals-to-the-indian-ocean
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