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Interdecadal variations in ENSO teleconnection to the Indo-Western Pacific for 1870-2007

Chowdary, JS and Xie, SP and Tokinaga, H and Okumura, YM and Kubota, H and Johnson, N and Zheng, XT (2012) Interdecadal variations in ENSO teleconnection to the Indo-Western Pacific for 1870-2007. Journal of Climate, 25 (5). pp. 1722-1744.

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Slow modulation of interannual variability and its relationship to El Niño-Southern Oscillation (ENSO) is investigated for the period of 1870-2007 using shipboard surface meteorological observations along a frequently traveled track across the north Indian Ocean (NIO; from the Gulf of Aden through Malacca Strait) and the South China Sea (to Luzon Strait). During the decades in the late nineteenth-early twentieth century and in the late twentieth century, the El Niño-induced NIO warming persists longer than during the 1910s-mid-1970s, well into the summer following the peak of El Niño. During the epochs of the prolonged NIO warming, rainfall drops and sea level pressure rises over the tropical northwest Pacific in summer following El Niño. Conversely, during the period when the NIO warming dissipates earlier, these atmospheric anomalies are not well developed. This supports the Indian Ocean capacitor concept as a mechanism prolonging El Niño influence into summer through the persistent Indian Ocean warming after El Niño itself has dissipated. The above centennial modulation of ENSO teleconnection to the Indo-northwest Pacific region is reproduced in an atmospheric general circulation model forced by observed SST. The modulation is correlated not with the Pacific decadal oscillation but rather with the ENSO variance itself. When ENSO is strong, its effect in the Indo-northwest Pacific strengthens and vice versa. The fact that enhanced ENSO teleconnections occurred 100 years ago during the late nineteenth-early twentieth century indicates that the recent strengthening of the ENSO correlation over the Indo-western Pacific may not entirely be due to global warming but reflect natural variability.

Item Type: Article
Additional Information: Copyright of this article belongs to American Meteorological Society.
Uncontrolled Keywords: Climate variability; Decadal variability; El Nino; ENSO; Interannual variability, Atmospheric pressure; Climatology; Global warming; Modulation; Rain; Sea level, Nickel compounds, annual variation; atmospheric general circulation model; climate variation; decadal variation; El Nino-Southern Oscillation; global warming; nineteenth century; rainfall; summer; teleconnection; twentieth century, Arabian Sea; Gulf of Aden; Indian Ocean; Indian Ocean (North); Pacific Ocean; South China Sea
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 21 Dec 2013 06:28
Last Modified: 21 Dec 2013 06:28

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