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Discussion papers
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 26 Apr 2019

Submitted as: research article | 26 Apr 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Surveillance of SO2 and NO2 from ship emissions by MAX-DOAS measurements and implication to compliance of fuel sulfur content

Yuli Cheng1, Shanshan Wang1,2, Jian Zhu1, Yanlin Guo1, Ruifeng Zhang1, Yiming Liu1, Yan Zhang1,2,3, Qi Yu1,2, Weichun Ma1,2, and Bin Zhou1,2,3 Yuli Cheng et al.
  • 1Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University, Shanghai, China
  • 2Shanghai Institute of Eco-Chongming (SIEC), No. 3663 Northern Zhongshan Road, Shanghai, 200062, China
  • 3Institute of Atmospheric Sciences, Fudan University, Shanghai, 200433, China

Abstract. With the increased concerns on the shipping emitted air pollutants, the feasible technology for the surveillance is in high demand. Here we presented the shore-based Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) measurements of emitted SO2 and NO2 from ships under different traffic conditions in China's ship emission control area (ECA) of Shanghai and Shenzhen, China. These three typical measurement sites are used to represent emission scenarios of ship docked at berth, navigation in the inland waterway and inbound/outbound in the deep water port. With 2-dimensional scanning, the observation shows that the hotspots of SO2 and NO2 can be quickly and easily located from multiple berth. Although the MAX-DOAS measurements can not distinguish the single ship plume in the busy shipping lanes of inland waterway area, it certificates that the variations of SO2 and NO2 levels are mainly impacted by the ship traffic density and atmospheric dispersion conditions. In the open water area with low density of vessels, the MAX-DOAS measurements can capture the pulse signal of ship emitted SO2 and NO2 very well, and characterize the peaks altitude and insistent duration of the individual ship plumes. Combined with the ship information of activity data, rated power of engine and fuel sulfur content, it was found that SO2 / NO2 ratio in single plume is usually low (< 1.5) for inbound vessel due to the usage of auxiliary engine with less power and clean fuel of low sulfur content. Meanwhile, the unexpected high SO2 / NO2 ratio implies the fuel usage with sulfur content exceeding limit of regulations. Therefore, the observed SO2 / NO2 ratio in the plume of single ship can be used as the index for the compliance of fuel sulfur content, and then tag the suspicious ship for further enforcement. Combined the ship emission estimated by actual operation parameters and logical sulfur content, the shore-based MAX-DOAS measurement will provide the fast and more accurate way for the surveillance of ship emissions.

Yuli Cheng et al.
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Yuli Cheng et al.
Yuli Cheng et al.
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Short summary
Since the emission control zone (ECA) regulation has been proposed and implemented gradually, the reliable and practical monitoring system are highly demanded for compliance of fuel sulfur content. We presented the shore-based MAX-DOAS measurements of ship emitted SO2 and NO2 under different traffic conditions, indicating that this technique has high potential in the fast and more accurate way for the surveillance of ship emissions and fuel sulfur content.
Since the emission control zone (ECA) regulation has been proposed and implemented gradually,...