NASA / JPL / SCIENCE PHOTO LIBRARY NASA / JPL / SCIENCE PHOTO LIBRARY
Global water vapour levels. Map showing the mean clear air precipitable water (water vapour) in July 2003 2009 between 4.25 kilometres altitude and the top of the atmosphere. Low concentrations are beige, through brown, green and light blue to dark blue for higher concentrations. Concentrations are higher in the northern hemisphere, where it is summer. Data obtained using the Atmospheric Infrared Sounder (AIRS) instrument on the NASA Aqua Spacecraft.
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