NOAA / WHYMAP / MATTHEW RODELL / NASA / GSFC / SCIENCE PHOTO LIBRARY NOAA / WHYMAP / MATTHEW RODELL / NASA / GSFC / SCIENCE PHOTO LIBRARY
Global and US underground water supplies. Animation sequences showing changes in world and US underground water supplies. The first sequence shows rivers and lakes (blue) and aquifers (purple) on an Earth map (cylindrical projection) using WHYMAP (World-wide Hydrogeological Mapping and Assessment Programme) data. This is followed by a series of monthly global anomaly maps from NASA's GRACE (Gravity Recovery and Climate Experiment) satellites. These monthly maps show areas that were wetter (blue) or drier (orange) than average over a six-year period from August 2005 to August 2011 (this sequence shows seasonal variations). This is followed by a map of the USA using a model developed by Goddard Space Flight Center with the National Drought Mitigation Center. This model, which combines GRACE and other data, shows drought in Texas, Georgia and Alabama in 2011 and 2012, compared to wetter periods in 2009 and 2010. The final frame returns to the global map. Text labels throughout describe the importance of groundwater supplies for the world's growing population and crop irrigation, and how climate change can put pressure on these resources. Data from the GRACE satellite is being used to track changes and help conserve underground water supplies. This animation was published in May 2011. For a version with text labels, see K003/3319.
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