Siberian Arctic black carbon sources constrained by model and observation

摘要: Black carbon (BC) in haze and deposited on snow ice can have strong effects the radiative balance of Arctic. There is a geographic bias Arctic BC studies toward Atlantic sector, with lack observational constraints for extensive Russian Siberian Arctic, spanning nearly half circum-Arctic. Here, 2 y observations at Tiksi (East Arctic) establish seasonality both concentrations (8 ng⋅m−3 to 302 ng⋅m−3) dual-isotope–constrained sources (19 73% contribution from biomass burning). Comparisons between dispersion model, coupled an anthropogenic emissions inventory fire inventory, give mixed results. In European this model has proven simulate source contributions well. However, less successful reproducing Using Bayesian approach, we show that, contrast earlier studies, gas flaring (6%), power plants (9%), open fires (12%) are relatively small, major instead being domestic (35%) transport (38%). The observation-based evaluation reported identifies errors spatial allocation highlights importance improving emission distribution attribution, develop reliable mitigation strategies efficient reduction impact one fastest-warming regions Earth.