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

• Main Authors: Marelle, L., Thomas, J. L., Raut, J. -C., Law, K. S., Jalkanen, J. -P., Johansson, L., Roiger, A., Schlager, H., Kim, J., Reiter, A., Weinzierl, B.
• Other Authors: Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2015
• Subjects: [SDU]Sciences of the Universe [physics]; Arctic; Norway; black carbon; Northern Norway
• Online Access: https://hal-insu.archives-ouvertes.fr/insu-03634068; https://doi.org/10.5194/acpd-15-18407-2015

International audience 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 NO x and SO 2 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 NO x , SO 2 and O 3 measured during ACCESS flights. The same WRF-Chem simulations show that the magnitude of NO x and O 3 production from ship emissions at the surface is not very sensitive (< 5 %) to the horizontal grid resolution (15 or 3 km), while surface PM 10 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 NO x (∼ +80 %), O 3 (∼ +5 %), black carbon (∼ +40 %) and PM 2.5 (∼ +10 %) along the Norwegian coast. Over the same period ship emissions in northern Norway have a shortwave (direct + semi-direct + indirect) radiative effect of -9.3 m W m -2 at the global scale.