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M. Issa Lélé and Peter J. Lamb

are developed fully. Interestingly, it was found also that the ITF tends to retreat early (late) in seasons when it advanced early (late). Because of this situation, the April ITF latitude specification of the September–October ITF latitude and rainfall (negative) was almost as consistent as that for July (positive). In keeping with the above findings, the secular variation of ITF latitude during 1974–2003 strongly influenced MCWS and rainfall variability on decadal time scales. Several of the

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Rong-Hua Zhang and Antonio J. Busalacchi

1. Introduction Recently, there has been an increased interest in tropical instability waves (TIWs) in the tropical oceans, since they were first detected from satellite SST observations about three decades ago ( Legeckis 1977 ). In the tropical Pacific Ocean, for example, TIWs arise in the far eastern basin and then propagate westward as prominent mesoscale signals. Associated with these, SST fields show cusplike waves in the eastern equatorial Pacific, propagating westward along both the

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