Slant column densities of stratospheric nitrogen dioxide (NO2) determined from spectroscopic measurements of zenith scattered twilight at wavelengths from 430-485 nanometres.
These data are provided by the NDACC (Network for the Detection of Atmospheric Composition Change) on an annual basis and then stored at the AADC. Only data that are two years old are made available.
Further information ... about the dataset is available from the URL given below.
This work was performed as part of ASAC project 2244, but this project has since been replaced by AAS project 4193, "Long-term measurements of atmospheric nitrogen dioxide at Macquarie Island".
The fields in this dataset are:
NO2 slant column density (molecules/cm**2)
Error in NO2 slant column density (molecules/cm**2)
NO2 Air Mass Factor (AMF)
NO2 vertical column density (molecules/cm**2)
Year of Observation (UT)
Day of month (UT)
Latitude of observation site; decimal degrees
Longitude of observation site; decimal degrees
Elevation of site; meters
Solar zenith angle at time of observation; decimal degrees
Taken from the 2008-2009 Progress Report:
Public summary of the season progress:
Ground-based measurements of nitrogen dioxide (NO2), one of the key trace gases in the atmosphere, have been made at Macquarie Island since 1996 and span now more than 12 years. These long-term observations made at Macquarie Island help us to bridge the gap between measurements made in the Antarctic and at mid-latitudes. The observations during the 2008/2009 season went smoothly and we have no problems to report.