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Jean-Philippe Duvel

more TDs. As mentioned above, one may thus consider that large-scale cyclonic vorticity perturbation related to the MJO does not promote the intensification of existing TDs. Instead, the cyclonic shear of the zonal low-level jet generated by the MJO could be unstable and multiply the number of TD initiations. During the Cooperative Indian Ocean Experiment on Intraseasonal Variability in the Year 2011 (CINDY2011)–DYNAMO experiment ( Yoneyama et al. 2013 ), many tropical depressions were observed

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George N. Kiladis, Juliana Dias, Katherine H. Straub, Matthew C. Wheeler, Stefan N. Tulich, Kazuyoshi Kikuchi, Klaus M. Weickmann, and Michael J. Ventrice

made in understanding and forecasting the MJO over the past four decades, it remains a significant outstanding problem in tropical meteorology (see Zhang et al. 2013 ). As discussed in detail by Straub (2013 , hereafter S13 ), one of the challenges faced by researchers studying the MJO has to do not only with tracking the disturbance through time, but simply defining it. This difficulty stems from the fact that the MJO is associated with strong planetary circulation anomalies, and similar

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