Studying volcanos can be hazardous work, both for researchers and aircraft. To penetrate such dangerous airspace, unmanned aerial vehicles (UAVs), especially those with electric engines that ingest little contaminated air, are an emerging and effective way to gather crucial data about volcanic ash and gases.
A team of NASA researchers deployed three UAVs with special instruments into and above the noxious sulfur dioxide plume of Costa Rica's active Turrialba volcano, near San Jose. The project was designed to improve the remote-sensing capability of satellites, including satellite data research products such as maps of the concentration and distribution of volcanic gases. It was also designed to improve computer models of how and where volcanic plumes will travel.
Led by principal investigator David Pieri of NASA's Jet Propulsion Laboratory, Pasadena, Calif., the team launched 10 flights of the remote controlled UAVs into the volcanic plume and above the rim of Turrialba's 10,500-foot (3,200-meter) summit crater.
The small, twin-electric-engine Dragon Eye UAVs were operated by researchers at NASA's Ames Research Center. Weighing less than six pounds each and with a wingspan of 3.75 feet, they have visible and infrared video cameras and can carry a one-pound instrument payload for up to an hour within a volcanic plume. The researchers equipped them with sulfur dioxide sensors, particle sensors and automatic atmospheric sampling bottles keyed to measure sulfur dioxide concentration.
During the flights, the team coordinated its data gathering with NASA's Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) instrument on NASA's Terra spacecraft, allowing scientists to compare sulfur dioxide concentration measurements from the satellite with measurements taken from within the plume.
Scientists believe computer models derived from this study will contribute to safeguarding the National and International Airspace System, and will also improve global climate predictions and mitigate environmental hazards (e.g., sulfur dioxide volcanic smog, or "vog") for people who live near volcanoes.
Key constituents of such models are the intensity and character of the volcanic activity located near the eruption vent. For instance, knowing the height of ash and gas concentrations, and temperatures over the vent during an eruption are important initial factors for any model that predicts the direction of the volcanic plume.
