Preprints
https://doi.org/10.5194/acp-2021-212
https://doi.org/10.5194/acp-2021-212

  06 Apr 2021

06 Apr 2021

Review status: this preprint is currently under review for the journal ACP.

Annual changes of ship emissions around China under gradually promoted control policies from 2016 to 2019

Xiaotong Wang1,, Wen Yi1,, Zhaofeng Lv1, Fanyuan Deng1, Songxin Zheng1, Hailian Xu1, Junchao Zhao1, Huan Liu1, and Kebin He1 Xiaotong Wang et al.
  • 1State Key Joint Laboratory of ESPC, School of Environment, Tsinghua University, Beijing 100084, China
  • These authors contributed equally to this work.

Abstract. Ship emissions and coastal air pollutions around China are expected to be alleviated with the gradually implemented of domestic ship emission control (DECA) policy. However, there is so far a lack of a comprehensive post assessment on the ship emission response after the policy implementation. This study developed a series of high spatiotemporal ship emission inventories of China’s inland rivers and the 200 Nm zone from 2016 to 2019 based on an updated Ship Emission Inventory Model (SEIM v2.0) and analysed the interannual changes of emissions under the influence of both ship activity increase and gradually promoted policy. The route restoration technology in SEIM v2.0 has greatly improved the spatial distribution of ship emissions and the river vessels (RVs) are better distinguished by using the spatial frequency distribution method. From 2016 to 2019, SO2 and PM emissions from ships decreased by 29.6 % and 26.4 %, respectively, while ship NOX emissions increased by 13.0 %. Although the DECA 1.0 policy has been implemented since 2017, it was not until 2019 with the DECA 2.0 that significant emission reduction was achieved, e.g., 33.3 % regarding SO2. Considering the potential emissions brought by continuous growth of maritime trade, however, an even larger emission reduction effect of 39.8 % was achieved in 2019 compared with the scenario without switching cleaner fuel. Although ocean-going vessels (OGVs) contributed to approximately 2/3 of ship emissions in Chinese waters, 2/3 of them came from ships registered in other countries. Containers and bulk carriers are still the dominate contributors to ship emissions, and newly-built, large ships and ships using clean fuel oil are taking an increasingly large proportion in emission structure. The four-year consecutive daily ship emissions were presented for major ports, which timely reflects the response of step-by-step DECA policy on emissions and may provide useful references for port observation experiments and local policy making. In addition, the spatial distribution shows that a number of ships detoured outside the scope of DECA 2.0 in 2019 to save the cost on more expensive low sulphur oil, increasing emissions in farther maritime areas. The multi-year ship emission inventory provide high-quality datasets for air quality and dispersion modellings, as well as verifications for in-situ observation experiments, which may also guide further ship emission control direction in China.

Xiaotong Wang 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 acp-2021-212', Anonymous Referee #1, 04 Jun 2021
  • RC2: 'Comment on acp-2021-212', Anonymous Referee #2, 15 Jun 2021

Xiaotong Wang et al.

Xiaotong Wang et al.

Viewed

Total article views: 295 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
211 76 8 295 16 0 6
  • HTML: 211
  • PDF: 76
  • XML: 8
  • Total: 295
  • Supplement: 16
  • BibTeX: 0
  • EndNote: 6
Views and downloads (calculated since 06 Apr 2021)
Cumulative views and downloads (calculated since 06 Apr 2021)

Viewed (geographical distribution)

Total article views: 263 (including HTML, PDF, and XML) Thereof 263 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Latest update: 18 Jun 2021
Download
Short summary
This study developed a series of high spatiotemporal ship emission inventories around China from 2016 to 2019 based on ship big data. The inter-annual changes of ship emissions could provide high-quality datasets for air quality modellings and verifications for in-situ observation experiments. The effect of DECA policy was evaluated under the influence of both ship activity increase and gradually promoted policies, which may also guide further ship emission control direction in China.
Altmetrics