Air quality and radiative impacts of Arctic shipping emissions in the summertime in northern Norway: from the local to the regional scale

In this study, we quantify the impacts of shipping pollution on air quality and shortwave radiative effect in northern Norway, using WRF-Chem simulations combined with high resolution, real-time STEAM2 shipping emissions. STEAM2 emissions are evaluated using airborne measurements from the ACCESS campaign, which was conducted in summer 2012, in two ways. First, emissions of NOx and SO2 are derived for specific ships from in-situ measurements in ship plumes and FLEXPART-WRF plume dispersion modeling, and these values are compared to STEAM2 emissions for the same ships. Second, regional WRF-Chem runs with and without ship emissions are performed at two different resolutions, 3 km × 3 km and 15 km × 15km, and evaluated against measurements along flight tracks and average campaign profiles in the marine boundary layer and lower troposphere. These comparisons show that differences between STEAM2 emissions and calculated emissions can be quite large (−57 to +148 %) for individual ships, but that WRF-Chem simulations using STEAM2 emissions reproduce well the average NOx, SO2 and O3 measured during ACCESS flights. The same WRF-Chem simulations show that the magnitude of NOx and O3 production from ship emissions at the surface is not very sensitive (< 5 %) to the horizontal grid resolution (15 or 3 km), while surface PM10 enhancements due to ships are moderately sensitive (15 %) to resolution. The 15 km resolution WRF-Chem simulations are used to estimate the local and regional impacts of shipping pollution in northern Norway. Our results indicate that ship emissions are an important local source of pollution, enhancing 15 day averaged surface concentrations of NOx (∼ +80 %), O3 (∼ +5 %), black carbon (∼ +40 %) and PM2.5 (∼ +10 %) along the Norwegian coast. Over the same 15-day period, ship emissions in northern Norway have a global shortwave (direct + semi-direct + indirect) radiative effect of −9.3 m W m-2

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