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Satellite validation of CFCs over the High Arctic


Atmospheric satellite data plays an important role in monitoring and surveying trace gas concentrations in the atmosphere, including ozone depleting substances. This includes CFC-11, CFC-12, and HCFC-22. Under the Montreal Protocol and its amendments, these have been phased out (or are being phased in the case of HCFC-22). Due to their atmospheric lifetimes, continued observation of their concentration in the atmosphere is necessary. The available atmospheric satellite datasets have to be validated thoroughly to show their reliability and to encourage their application in atmospheric research.

Ground-based measurements at the Canadian Arctic research station PEARL (Polar Environment Atmospheric Research Laboratory) provide a high-quality, if localized, view of the atmosphere within the High Arctic.

I will present comparison results for ozone depleting substances obtained from two satellite instruments with ground-based measurements from PEARL. The first is the CFC-11, CFC-12, and HCFC-22 dataset from the ACE-FTS instrument (Atmospheric Chemistry Experiment Fourier Transform Spectrometer) on SCISAT. The second instrument is HIRDLS (High Resolution Dynamics Limb Sounder) on Aura, which obtained profiles for CFC-11 and CFC-12.