NCEP reanalysis and AVHRR OLR were provided by the National Oceanic and Atmospheric Administration (NOAA)-Cooperative Institute for Research in Environmental Sciences (CIRES) Earth System Research Laboratory (ESRL)/Physical Sciences Division (PSD) Climate Diagnostics Branch, Boulder, Colorado (http://www.cdc.noaa.gov).
We thank the ECMWF for providing the ERA-40 and ERA-Interim data. A study of this type was made possible through the efforts of the MJO working group, and their development of an MJO diagnostic package. This research was made possible through the support of the Max Planck Society for the Advancement of Science and the German Climate Computing Centre (Deutsches Klimarechenzentrum; DKRZ), Hamburg. The research leading to these results has received funding from the European Union, Seventh Framework Program (FP7/2007-2013) under Grant Agreement 244067. Jürgen Bader is thanked for his comments on an earlier draft of this article. We thank the anonymous reviewers for their careful reading of the manuscript and constructive comments.
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