Identifying fire plumes in the Arctic with tropospheric FTIR measurements and transport models

摘要: Abstract. We investigate Arctic tropospheric composition using ground-based Fourier transform infrared (FTIR) solar absorption spectra, recorded at the Polar Environment Atmospheric Research Laboratory (PEARL, Eureka, Nunavut, Canada, 80°05' N, 86°42' W) and Thule (Greenland, 76°53' −68°74' from 2008 to 2012. The target species, carbon monoxide (CO), hydrogen cyanide (HCN), ethane (C2H6), acetylene (C2H2), formic acid (HCOOH), formaldehyde (H2CO) are emitted by biomass burning can be transported mid-latitudes Arctic. By detecting simultaneous enhancements of three tracers (HCN, CO, C2H6), ten eight fire events identified Eureka Thule, respectively, within 5-year FTIR time series. Analyses Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) model back-trajectories coupled with Moderate Resolution Imaging Spectroradiometer (MODIS) hotspot data, Stochastic Time-Inverted Transport (STILT) footprints, Ozone Monitoring Instrument (OMI) UV aerosol index maps, used attribute source regions travel durations plumes. taking into account effect aging smoke plumes, measured enhancement ratios were corrected obtain emission equivalent factors. means factors for extratropical forest estimated two data sets 0.40 ± 0.21 g kg−1 HCN, 1.24 0.71 C2H6, 0.34 C2H2, 2.92 1.30 HCOOH. factor CH3OH is 3.44 1.68 kg−1. To improve our knowledge concerning dynamical chemical processes associated pollution fires, measurements compared Model OZone And Related Tracers, version 4 (MOZART-4). Seasonal cycles day-to-day variabilities assess ability reproduce emissions fires their transport. Good agreement in winter confirms that transport well implemented model. For however, lower wintertime concentration as observations highlights an underestimation its emission. Results show modeled total columns correlated (linear correlation coefficient r > 0.6 all gases except H2CO HCOOH Thule), but suggest a general concentrations seven species high