16 Jun 2022
16 Jun 2022
Status: this preprint is currently under review for the journal ACP.

Current and future prediction of inter-provincial transport of ambient PM2.5 in China

Shansi Wang1, Siwei Li1,2, Jia Xing3, Yu Ding1, Senlin Hu1, Shuchang Liu3, Yu Qin4, Zhaoxin Dong3, Jiaxin Dong1, Ge Song1, and Lechao Dong1 Shansi Wang et al.
  • 1School of Remote Sensing and Information Engineering, Wuhan University, Wuhan, 430079, China
  • 2State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, 430079, China
  • 3School of Environment, Tsinghua University, Beijing, 100084, China
  • 4Map Institute of Guangdong Province, Guangzhou, 510075, China

Abstract. Regional transport is as much important as local sources that contributing to PM2.5 pollution and causing associated environmental inequality. In the context of future climate change, the effect of the responses of regional transport to the warming meteorology has not been thoroughly investigated. Here we establish cross-province PM2.5 source-receptor matrix in China in 2015 and two climate pathways in 2050s (SSP585 and SSP126), using Community Multi-scale Air Quality model embedded with the Integrated Source Apportionment Method. Results suggest that across-regional transport contributes 27 % - 56.8 % of PM2.5 in five severely polluted regions, which is even more important compared to inner transport within the target region (13.2 % - 20.9 %), especially in Chuanyu and Fenwei regions where suffers large PM2.5 transport (over 50 %) from outside regions. Such results imply that joint-control policy should not only focus on neighboring provinces. Future warming scenario (SSP585) will exacerbate PM2.5 pollution (2 - 5 µg/m3) and also enhance its regional transport (> 3 %) mostly by modulating the across-regional transport rather than inner regional transport. Such enhancement of regional transport of PM2.5 can be significantly weaken (approximately by half) under SSP126 pathway, demonstrating the importance of climate change mitigation on weakening the regional transport of PM2.5 to maximize the co-benefits in both air quality and climate.

Shansi 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-2022-368', Anonymous Referee #1, 05 Jul 2022
  • RC2: 'Comment on acp-2022-368', Anonymous Referee #2, 20 Aug 2022

Shansi Wang et al.

Shansi Wang et al.


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Short summary
Future warming meteorological conditions may enhance the influence of regional transport on PM2.5 pollution. Our results prove that climate-friendly policy could lead to considerable co-benefits in mitigating the regional transport of PM2.5 in future. Meanwhile, climate change will exert larger impacts on across-regional (long-distance) transport than inner (neighboring provinces) regional transport, highlighting the significance of multi-regional cooperation in the future.