I have downloaded this file from NOAA at:

https://www.nasa.gov/sites/default/files/watervapor_overviewwest-1.gif

This .gif file is an animation of satellite derived water vapor fluctuations across the central pacific ocean over a 5 day period.  The Doldrums and Trade Winds are clearly visible.  Also the increase in equatorial vapor concentration towards the western portion of the ocean is duly noted.

 

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