Five years of CO, HCN, C 2 H 6 , C 2 H 2 , CH 3 OH, HCOOH and H 2 CO total columns measured in the Canadian high Arctic

摘要: Abstract. We present a five-year time series of seven tropospheric species measured using ground-based Fourier transform infrared (FTIR) spectrometer at the Polar Environment Atmospheric Research Laboratory (PEARL; Eureka, Nunavut, Canada; 80°05' N, 86°42' W) from 2007 to 2011. Total columns and temporal variabilities carbon monoxide (CO), hydrogen cyanide (HCN) ethane (C2H6) as well first derived total Eureka acetylene (C2H2), methanol (CH3OH), formic acid (HCOOH) formaldehyde (H2CO) are investigated, providing new data set in sparsely sampled high latitudes. obtained SFIT2 retrieval algorithm based on optimal estimation method. The microwindows priori profiles selected optimize information content retrievals, error analyses performed for all species. Our retrievals show good sensitivities troposphere. seasonal amplitudes series, ranging 34 104%, captured while single profile each CO, C2H6 C2H2 PEARL exhibit strong cycles with maxima winter minima summer, opposite phase HCN, CH3OH, HCOOH H2CO series. These result relative contributions photochemistry, oxidation transport biogenic biomass burning emissions. Comparisons FTIR partial coincident satellite measurements by Chemistry Experiment Transform Spectrometer (ACE-FTS) agreement. correlation coefficients slopes range 0.56 0.97 0.50 3.35, respectively, target is compared previous found literature assess atmospheric budgets these Arctic. CO C2H6concentrations consistent negative trends observed over Northern Hemisphere, attributed fossil fuel emission decrease. importance poleward HCN highlighted. Columns CH3OH comparable other remote sites. However, small early May might reflect its large variability and/or effect updated spectroscopic parameters used our retrievals. Overall, emissions contribute day-to-day Eureka.