We are grateful to E. Harrison and S. Hankin of NOAA/PMEL for providing us with FERRET, a very useful diagnostic and graphic program. We also thank two anonymous reviewers for suggestions that led to significant improvements in the manuscript. This work and publication was funded by a grant from the Joint Institute for the Study of the Atmosphere and Ocean (JISAO) at the University of Washington under NOAA Cooperative Agreement NA67RJ0155, Contribution 587. The views expressed herein are those of the authors and do not necessarily reflect the views of NOAA or any of its subagencies.
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