The PARABLE project uses balloon-based solar occultation spectrometry to measure trace gases in the stratosphere. In 2015, PARABLE launched a payload containing four spectrometers, including a DA2 FTIR, on a 20-hour balloon flight from Timmins, Ontario. Solar occultation involves measuring atmospheric layers at sunrise and sunset to calculate transmission spectra for analysis and comparison to satellite data. The DA2 FTIR uses Fourier transform spectroscopy to simultaneously collect infrared spectral data over a wide range, allowing observation of gases like methane, nitrous oxide, and chlorofluorocarbons.