热带不稳定波的年际变化及其与ENSO的关系

doi:10.11978/j.issn.1009-5470.2015.03.004

Abstract

Abstract: Using NOAA OISST V2.0 reanalysis data, we studied the interannual variability of tropical instability waves (TIWs). Results show that: TIWs usually appear during May and July and are absent in December or next January. A negative relationship is identified between the year-to-year variations of TIWs activity and that of ENSO intensity, with stronger TIWs activity in La Nina years and weaker TIWs activity in El Niño years. The negative relationship is more evident in the active period of TIWs during June and December, and the biggest correlation coefficient is in December. Applying lead/lag correlation analysis on TIWs index and NINO 3.4 SSTA, the results suggest that the maximum correlation coefficient appears when TIWs index leads the ENSO index by 2~3 months, which indicate that the TIWs may modulate the cycle of the ENSO.

Key words: TIWs, interannual variability, ENSO

JIN Xiao-lin, LI Zhong-xian, ZHENG Zhi-hai, WANG Da-jun. Interannual variability of the TIWs and its relationship with the ENSO[J].Journal of Tropical Oceanography, 2015, 34(3): 30-35.

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Interannual variability of the TIWs and its relationship with the ENSO

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