Warming world: Satellites and weather balloons

  • Image: NASA

  • Image: British Antarctic Survey

  • Image: NASA

  • Image: NOAA

  • Image: Bredk / creativecommons.org

  • Image: Q. Fu / IPCC

    Scientists record temperatures in the troposphere and stratosphere using both satellite and radiosondes. Radiosondes measure air temperature using thermometers carried aloft by balloons. Satellites measure the energy given off by the Earth’s atmosphere, from which scientists calculate the temperature. Both radiosonde and satellite measurements show a long-term warming trend in recent decades.