Atmos. Chem. Phys., 17, 10997–11023, 2017 https://doi.org/10.5194/acp-17-10997-2017 © Author(s) 2017. This work is distributed under the Creative Commons Attribution 3.0 License. Monitoring shipping emissions in the German Bight using MAX-DOAS measurements André Seyler1, Folkard Wittrock1, Lisa Kattner1,2, Barbara Mathieu-Üffing1,2, Enno Peters1, Andreas Richter1, Stefan Schmolke2, and John P. Burrows1 1Institute of Environmental Physics, University of Bremen, Germany 2Federal Maritime and Hydrographic Agency (BSH), Hamburg, Germany Correspondence to: André Seyler (
[email protected]) Received: 22 December 2016 – Discussion started: 9 January 2017 Revised: 26 June 2017 – Accepted: 17 July 2017 – Published: 15 September 2017 Abstract. A 3-year time series of ground-based multi-axis fur content, in 2015/2016. By sorting measurements accord- differential optical absorption spectroscopy (MAX-DOAS) ing to the prevailing wind direction and selecting two angu- measurements of NO2 and SO2 on the island Neuwerk has lar reference sectors representative for wind from the open been analyzed for contributions from shipping emissions. North Sea and coast excluding data with mixed air mass ori- The island is located in the German Bight, close to the main gin, relative contributions of ships and land-based sources shipping lane (at a distance of 6–7 km) into the river Elbe to- to air pollution levels in the German Bight have been esti- wards the harbor of Hamburg. Measurements of individual mated to be around 40 % : 60 % for NO2 as well as SO2 in ship plumes as well as of background pollution are possi- 2013/2014, dropping to 14 % : 86 % for SO2 in 2015/2016.