How rare are the 2006-2008 positive Indian Ocean Dipole events? An IPCC AR4 climate model perspective
Article
Article Title | How rare are the 2006-2008 positive Indian Ocean Dipole events? An IPCC AR4 climate model perspective |
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ERA Journal ID | 1874 |
Article Category | Article |
Authors | Cai, W., Sullivan, A. and Cowan, T. |
Journal Title | Geophysical Research Letters |
Journal Citation | 36 (8) |
Number of Pages | 5 |
Year | 2009 |
Publisher | John Wiley & Sons |
Place of Publication | United States |
ISSN | 0094-8276 |
1944-8007 | |
Digital Object Identifier (DOI) | https://doi.org/10.1029/2009GL037982 |
Web Address (URL) | https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2009GL037982 |
Abstract | [1] The occurrence of three consecutive positive Indian Ocean Dipole (pIOD) events through 2006–2008, along with the unusual pIOD-La Niña combination in 2007, calls for a statistical assessment into the rarity of such events. To this end, we take 50 years from 19 climate models submitted for the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment (AR4) to provide a 950-year realization. Only six models produce a total of nine pIOD-La Niña pairs, with one occurrence of three consecutive pIOD events. The rarity is not due to an overly strong model El Niño-pIOD coherence. Two models produce the 2006–2007 sequence of one pIOD with an El Niño followed by a pIOD in a La Niña year, however, no models simulate the observed mechanism. Although the triggering processes vary between models, a commonality is that the trigger resides in the ocean, highlighting the importance of subsurface ocean observations in predicting pIODs. |
ANZSRC Field of Research 2020 | 370109. Tropospheric and stratospheric physics |
370202. Climatology | |
370803. Physical oceanography | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australia |
https://research.usq.edu.au/item/z09w8/how-rare-are-the-2006-2008-positive-indian-ocean-dipole-events-an-ipcc-ar4-climate-model-perspective
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