Contributions of transported Prudhoe Bay oil field emissions to the aerosol population in Utqiaġvik, Alaska

摘要: Abstract. Loss of sea ice is opening the Arctic to increasing development involving oil and gas extraction shipping. Given significant impacts absorbing aerosol secondary precursors emitted within rapidly warming region, it necessary characterize local anthropogenic sources compare natural conditions. From August September 2015 in Utqiaġvik (Barrow), AK, chemical composition individual atmospheric particles was measured by computer-controlled scanning electron microscopy with energy-dispersive X-ray spectroscopy (0.13–4 µm projected area diameter) real-time single-particle mass spectrometry (0.2–1.5 µm vacuum aerodynamic diameter). During periods influenced Ocean (70 % study), our results show that fresh spray contributed  ∼ 20 %, number, between 0.13 0.4 µm, 40–70 % 0.4 1 µm, 80–100 % 1 4 µm particles. In contrast, for emissions from Prudhoe Bay (10 % third largest field North America, there a strong influence submicron (0.13–1 µm) combustion-derived (20–50 % organic carbon, number; 5–10 % soot number). While still comprised a large fraction (90 % number 4 µm) detected under influence, these were internally mixed sulfate nitrate indicative aging processes during transport. addition, overall mode particle size distribution shifted 76 nm 27 nm concentrations 130 920 cm−3 due transported fields. The increased contributions carbonaceous combustion products partially aged should be considered future climate simulations.