The chemical composition of the Arctic atmosphere is influenced by both natural and anthropogenic effects. As atmospheric composition is tied to climate, studying the changes in trace gas species can lead to a more thorough understanding of the changing Arctic conditions. Between 2004 and 2017 the Portable Atmospheric Research Interferometric Spectrometer for the InfraRed (PARIS-IR) made measurements on a yearly basis at the Polar Environment Atmospheric Research Laboratory (PEARL; 80.05° N, 86.42° W) located in Eureka, Nunavut, as part of the Canadian ACE/OSIRIS Arctic Validation Campaigns. For the six-week duration of this annual campaign, from just after polar sunrise in late February through to the beginning of April, PARIS-IR recorded solar absorption spectra, within the range of 750 - 4400 cm-1, every seven minutes, weather permitting. Prior work has examined the evolution of eight trace gas species (O3, HNO3, HCl, HF, CH4, C2H6, N2O and CO) retrieved from the PARIS-IR springtime measurements for the period between 2006 and 2013. These retrieved trace gas quantities were also compared against coincident measurements made by the Atmospheric Chemistry Experiment Fourier Transform Spectrometer, of which PARIS-IR was designed to be a ground-based version. The focus of this study is to build upon this earlier work by Griffin et al. (2017) through the examination of an additional four years of data, 2014 to 2017, and the implementation of a ninth retrieved trace gas species, water vapor. In this talk the first results of the extended comparison and trend analysis will be presented for the eight species that were previously examined, and progress towards a water vapor retrieval will be shown.

Griffin, D., Walker, K. A., Conway, S., Kolonjari, F., Strong, K., Batchelor, R., Boone, C. D., Dan, L., Drummond, J. R., Fogal, P. F., Fu, D., Lindenmaier, R., Manney, G. L., & Weaver, D. (2017). Multi-year comparisons of ground-based and space-borne Fourier transform spectrometers in the high Arctic between 2006 and 2013. Atmospheric Measurement Techniques, 10(9), 3273-3294.