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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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Hamish A. Ramsay, Lance M. Leslie, and Jeffrey D. Kepert

) presented a more systematic study and confirmed that nearby land can induce a marked asymmetry in the low-level flow. The aim of this study is to document the inner-core asymmetries of a severe Southern Hemisphere TC (TC Larry in March 2006) in relation to the two primary mechanisms discussed above, using data previously obtained from a high-resolution numerical simulation ( Ramsay and Leslie 2008 ). TC Larry formed in the southwest Pacific Ocean over the Coral Sea region east of Australia at 0600 UTC

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