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| Strong large-scale winds can relay their energy to the ocean bottom and elicit an almost immediate intraseasonal barotropic (depth independent) response in the ocean. The intense winds associated with the Madden-Julian Oscillation (MJO), over the tropical interface between the Indian Ocean and the Pacific Ocean (popularly known as Maritime Continent) generate significant basin-wide intraseasonal barotropic sea level variability in the tropical Indian Ocean. Here we show, using an ocean general circulation model and a network of in-situ bottom pressure recorders, that the concerted barotropic response of the Indian and the Pacific Ocean to these winds leads to an intraseasonal see-saw of oceanic mass in the Indo-Pacific basin. This global-scale mass shift... |
| Tipo: Text |
Palavras-chave: Barotropic Response; Madden-Julian Oscillation; Ocean General Circulation Model. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00656/76846/78028.pdf |
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| Vialard, J.; Terray, P.; Duvel, J. -p.; Nanjundiah, R. S.; Shenoi, S. S. C.; Shankar, D.. |
| Most of the annual rainfall over India occurs during the Southwest (June-September) and Northeast (October-December) monsoon periods. In March 2008, however, Southern peninsular India and Sri Lanka received the largest rainfall anomaly on record since 1979, with amplitude comparable to summer-monsoon interannual anomalies. This anomalous rainfall appeared to be modulated at intraseasonal timescale by the Madden Julian Oscillation, and was synchronous with a decaying La Nia event in the Pacific Ocean. Was this a coincidence or indicative of a teleconnection pattern? In this paper, we explore factors controlling rainfall over southern India and Sri Lanka between January and April, i.e. outside of the southwest and northeast monsoons. This period accounts for... |
| Tipo: Text |
Palavras-chave: Rainfall interannual variability over India; El Nino/Southern Oscillation; Madden-Julian Oscillation; Teleconnections. |
| Ano: 2011 |
URL: https://archimer.ifremer.fr/doc/00227/33826/32467.pdf |
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