The Network for the Detection of Atmospheric Composition Change (NDACC) is composed of more than 70 globally distributed, ground-based, remote-sensing stations with more than 160 instruments making high-quality measurements of

atmospheric composition Atmospheric chemistry is a branch of atmospheric science in which the chemistry of the Earth's atmosphere and that of other planets is studied. It is a multidisciplinary approach of research and draws on environmental chemistry, physics, meteorol ...

in the

stratosphere The stratosphere () is the second layer of the atmosphere of the Earth, located above the troposphere and below the mesosphere. The stratosphere is an atmospheric layer composed of stratified temperature layers, with the warm layers of air ...

and upper

troposphere The troposphere is the first and lowest layer of the atmosphere of the Earth, and contains 75% of the total mass of the planetary atmosphere, 99% of the total mass of water vapour and aerosols, and is where most weather phenomena occur. From ...

for assessing the impact of stratosphere changes on the underlying troposphere and on global climate. It started out as The Network for Detection of Stratospheric Change (NDSC) in 1991 and was renamed to NDACC in 1995. Instrumentation includes

lidar Lidar (, also LIDAR, or LiDAR; sometimes LADAR) is a method for determining ranges (variable distance) by targeting an object or a surface with a laser and measuring the time for the reflected light to return to the receiver. It can also be ...

, microwave radiometers, Fourier-transform infrared, UV-visible DOAS ( differential optical absorption spectroscopy)-type, and Dobson-Brewer spectrometers, as well as spectral UV

radiometer A radiometer or roentgenometer is a device for measuring the radiant flux (power) of electromagnetic radiation. Generally, a radiometer is an infrared radiation detector or an ultraviolet detector. Microwave radiometers operate in the microwave w ...

References

External links

* * * * {{cite web , last=Hook , first=Simon , title=JPL Science: Network for the Detection of Atmospheric Composition Change (NDACC) , website=

JPL The Jet Propulsion Laboratory (JPL) is a federally funded research and development center and NASA field center in the City of La Cañada Flintridge, California, United States. Founded in the 1930s by Caltech researchers, JPL is owned by NASA an ...

Science , url=https://science.jpl.nasa.gov/projects/ndacc/ , date=n.d. , access-date=2021-10-12 Atmospheric sciences