A study of the Arctic NOy budget above Eureka, Canada

摘要: [1] Four years of trace gas measurements have been acquired using the Bruker 125HR Fourier Transform Infrared (FTIR) spectrometer installed at Polar Environment Atmospheric Research Laboratory (PEARL) in Canadian high Arctic. These compared with data from three models, namely Middle Atmosphere Model Data Assimilation System (CMAM-DAS), Global Environmental Multiscale stratospheric model online Belgium CHemistry package (GEM-BACH), and off-line 3D chemical transport SLIMCAT to assess total reactive nitrogen, NOy, budget above Eureka, Nunavut (80.05°N, 86.42°W). The FTIR also satellite by Chemistry Experiment-Fourier Spectrometer (ACE-FTS). is able measure four five primary species that form NOy: NO, NO2, HNO3, ClONO2, while fifth, N2O5, was obtained N2O5/(NO + NO2) ratio derived models ACE-FTS. Combining these results, a four-year time series NOy 15–40 km partial columns calculated. Comparisons each were made, revealing mean differences (± standard error mean) relative (−16.0 ± 0.6)%, (5.5 1.0)%, (−5.8 0.4)% for CMAM-DAS, GEM-BACH, SLIMCAT, respectively. difference between ACE-FTS (5.6 2.3)%. While we found no significant seasonal interannual columns, display nearly twice as much variability during spring summer period.