Four Fourier transform spectrometers and the Arctic polar vortex: instrument intercomparison and ACE-FTS validation at Eureka during the IPY springs of 2007 and 2008

摘要: Abstract. The Canadian Arctic Atmospheric Chemistry Experiment Validation Campaigns have been carried out at Eureka, Nunavut (80.05° N, 86.42° W) during the polar sunrise period since 2004. During International Polar Year (IPY) springs of 2007 and 2008, three ground-based Fourier transform infrared (FTIR) spectrometers were operated simultaneously. This paper presents a comparison trace gas measurements stratospherically important species involved in ozone depletion, namely O3, HCl, ClONO2, HNO3 HF, recorded with these spectrometers. Total column densities gases measured new Network for Detection Change (CANDAC) Bruker 125HR are shown to agree within 3.5% existing Environment Canada Bomem DA8 measurements. After smoothing both sets account lower spectral resolution University Waterloo Portable Research Interferometric Spectrometer Infrared (PARIS-IR), likewise PARIS-IR 7%. Concurrent also made satellite-based Transform (ACE-FTS) overpasses Eureka time periods. While one mandates ACE satellite mission is study depletion spring, previous validation exercises identified highly variable vortex conditions spring be challenge efforts. In this work, comparisons between CANDAC ACE-FTS used develop strict criteria that allow ground- instruments confidently compared. When taken into consideration, observed biases FTIR spectrometer not persistent years generally insignificant, though small positive ~5%, comparable magnitude those seen exercises, HCl HF 2007, negative −15.3%, −4.8% −1.5% O3 2008.