Diagnosis of the MJO Modulation of Tropical Cyclogenesis Using an Empirical Index

Suzana J. Camargo, Matthew C. Wheeler & Adam H. Sobel
The modulation of tropical cyclone activity by the Madden-Julian oscillation (MJO) is explored using an empirical genesis potential (GP) index. Composite anomalies of the genesis index associated with the different MJO phases are consistent with the composite anomalies in TC genesis frequency that occur in the same phases, indicating that the index captures the changes in the environment that are at least in part responsible for the genesis frequency changes. Of the four environmental variables...
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