16 Aug 2022
16 Aug 2022

Determination of NOx emission rates of sailing inland ships from on-shore measurements

Kai Krause1, Folkard Wittrock1, Andreas Richter1, Dieter Busch2, Anton Bergen2, and John P. Burrows1 Kai Krause et al.
  • 1Institute of Environmental Physics, University of Bremen, Bremen, Germany
  • 2State Agency for Nature, Environment and Consumer Protection in North Rhine-Westphalia (LANUV NRW), Recklinghausen, Germany

Abstract. Inland ships are an important source of NOx, especially for cities along busy waterways. The amount and effect of these emissions depends on the traffic density and the NOx emission rates of the individual vessels. Monitoring of ship emissions is usually carried out using in situ instruments on land and often relative NOx emission factors, e.g. the amount of emitted pollutants per amount of burnt fuel is reported, but in this study, NOx emission rates in g s-1 are investigated. Within the EU Life project Clean Inland Shipping (CLINSH), a new approach to calculate NOx emission rates from data of in situ measurement stations has been developed and is presented in this study. Peaks (i.e. elevated concentrations) of NOx were assigned to the corresponding source ships and each ship passage was simulated using a Gaussian-puff-model in order to derive the emission rate. In total over 32900 ship passages have been monitored over the course of 4 years. The emission rates of NOx were investigated with respect to ship speed, ship size and direction of travel. Individual comparisons of the on-shore emission rates and those made on-board of selected CLINSH ships show good agreement. Also the emission rates are of similar magnitude as emission factors from previous studies. In contrast to relative emission factors (in grams per kilogram fuel), the emission rates (in grams per second) do not need further knowledge about the fuel consumption of the ship and can therefore be used directly to investigate the effect of ship traffic on air quality.

Kai Krause et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-767', Fan Zhou, 04 Sep 2022
  • RC2: 'Comment on egusphere-2022-767', Anonymous Referee #2, 28 Sep 2022

Kai Krause et al.

Kai Krause et al.


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Short summary
Inland shipping is an important source of nitrogen oxides (NOx). The amount of emitted NOx depends on the characteristics of the individual vessels and the traffic density. Ship emissions are often characterized by the amount of emitted NOx per amount of burnt fuel, and further knowledge about fuel consumption is needed to quantify the total emissions caused by ship traffic. In this study, a new approach to derive absolute emission rates (in g/s) from on-shore measurement is presented.