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Trace gas measurements by Fourier Transform Infrared Spectroscopy (NDSC)

The FTIR (Fourier Transform Infrared Spectroscopy) has been established as a powerful tool for measurements of atmospheric trace gases. Using the sun or moon as light source, between 20-30 trace gases of the tropo- and stratosphere can be detected by their absorption features. The analysis of the spectra allow to retrieve the total zenith columns o

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Project date

Starts
1992-01-01

Ends
2014-09-30

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Summary

The FTIR (Fourier Transform Infrared Spectroscopy) has been established as a powerful tool for measurements of atmospheric trace gases. Using the sun or moon as light source, between 20-30 trace gases of the tropo- and stratosphere can be detected by their absorption features. The analysis of the spectra allow to retrieve the total zenith columns of the trace gases. For a few trace gases the pressure broadening of the lines allow to get additionally some informations on the vertical concentration profiles. Some important trace gases cannot be detected in the IR but in the UV/VIS. This makes it useful to record the whole spectral region from the IR from about 700/cm (14 µm) to the UV at 33000/cm (300 nm). Since 1992: routine observations of atmospheric trace gases. 2001: The routine observations are continued. Furthermore, the measurements within the NDSC are used for the project SAMMOA- and SCIAMACHY-Validation. 2002: The routine observations are continued. Furthermore, the measurements within the NDSC are used for the project SAMMOA-, SOGE- and SCIAMACHY-Validation. 2003: In 2003 it is planned to study the long-term trend of a few tropospheric trace gases, like CO, HCN or C2H6. 2004: The routine observations are continued. Ground-based FTIR observations are performed as part of the long-term observations within the NDSC. 2005: The routine observations are continued. Ground-based FTIR observations are performed as part of the long-term observations within the NDSC. 2007: The routine observations are continued. Ground-based FTIR observations are performed as part of the long-term observations within the NDACC. 2008: The overall aim is to follow the long-term evolution of the stratospheric trace gases. Throughout the last years the focus of the NDACC has changed and now includes tropospheric trace gases. In 2008 we will concentrate on the profile retrieval of tropospheric trace gases, like HCN and CH2O. In addition the analysis of water vapour from the FTIR-measurements will be performed.

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