These buoys measure ocean and air temperatures, currents, winds, and humidity.
Scientists, governments, and nongovernmental organizations (NGOs) collect data about El Niño using a number of technologies. The National Oceanic and Atmospheric Administration (NOAA), for instance, operates a network of scientific buoys. These buoys measure ocean and air temperatures, currents, winds, and humidity. The buoys are located at about 70 locations in the southern Pacific Ocean, from the Galapagos Islands to Australia.