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Significant wintertime PM_(2.5) mitigation in the Yangtze River Delta, China, from 2016 to 2019: observational constraints on anthropogenic emission controls

Wang, Liqiang and Yu, Shaocai and Li, Pengfei and Chen, Xue and Li, Zhen and Zhang, Yibo and Li, Mengying and Mehmood, Khalid and Liu, Weiping and Chai, Tianfeng and Zhu, Yannian and Rosenfeld, Daniel and Seinfeld, John H. (2020) Significant wintertime PM_(2.5) mitigation in the Yangtze River Delta, China, from 2016 to 2019: observational constraints on anthropogenic emission controls. Atmospheric Chemistry and Physics, 20 (23). pp. 14787-14800. ISSN 1680-7324. https://resolver.caltech.edu/CaltechAUTHORS:20210114-143037999

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Abstract

Ambient fine particulate matter (PM_(2.5)) mitigation relies strongly on anthropogenic emission control measures, the actual effectiveness of which is challenging to pinpoint owing to the complex synergies between anthropogenic emissions and meteorology. Here, observational constraints on model simulations allow us to derive not only reliable PM_(2.5) evolution but also accurate meteorological fields. On this basis, we isolate meteorological factors to achieve reliable estimates of surface PM_(2.5) responses to both long-term and emergency emission control measures from 2016 to 2019 over the Yangtze River Delta (YRD), China. The results show that long-term emission control strategies play a crucial role in curbing PM_(2.5) levels, especially in the megacities and other areas with abundant anthropogenic emissions. The G20 summit hosted in Hangzhou in 2016 provides a unique and ideal opportunity involving the most stringent, even unsustainable, emergency emission control measures. These emergency measures lead to the largest decrease (∼ 35 µg m⁻³, ∼ 59 %) in PM_(2.5) concentrations in Hangzhou. The hotspots also emerge in megacities, especially in Shanghai (32 µg m⁻³, 51 %), Nanjing (27 µg m⁻³, 55 %), and Hefei (24 µg m⁻³, 44 %) because of the emergency measures. Compared to the long-term policies from 2016 to 2019, the emergency emission control measures implemented during the G20 Summit achieve more significant decreases in PM_(2.5) concentrations (17 µg m⁻³ and 41 %) over most of the whole domain, especially in Hangzhou (24 µg m⁻³, 48 %) and Shanghai (21 µg m⁻³, 45 %). By extrapolation, we derive insight into the magnitude and spatial distribution of PM_(2.5) mitigation potential across the YRD, revealing significantly additional room for curbing PM_(2.5) levels.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.5194/acp-20-14787-2020DOIArticle
https://acp.copernicus.org/articles/20/14787/2020/acp-20-14787-2020-supplement.pdfPublisherSupporting Information
ORCID:
AuthorORCID
Yu, Shaocai0000-0001-9718-8246
Liu, Weiping0000-0002-1173-892X
Chai, Tianfeng0000-0003-3520-2641
Zhu, Yannian0000-0002-8371-1830
Rosenfeld, Daniel0000-0002-0784-7656
Seinfeld, John H.0000-0003-1344-4068
Alternate Title:Significant wintertime PM2.5 mitigation in the Yangtze River Delta, China, from 2016 to 2019: observational constraints on anthropogenic emission controls
Additional Information:© Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. Received: 27 May 2020 – Discussion started: 22 July 2020. - Revised: 18 September 2020 – Accepted: 9 October 2020 – Published: 2 December 2020. This study was supported by the Department of Science and Technology of China (nos. 2016YFC0202702, 2018YFC0213506, and 2018YFC0213503), National Research Program for Key Issues in Air Pollution Control in China (no. DQGG0107) and National Natural Science Foundation of China (nos. 21577126 and 41561144004). Pengfei Li is supported by Initiation Fund for Introducing Talents of Hebei Agricultural University (412201904) and Hebei Youth Top Fund (BJ2020032). This research has been supported by the Department of Science and Technology of China (grant nos. 2016YFC0202702, 2018YFC0213506, and 2018YFC0213503), National Research Program for Key Issues in Air Pollution Control in China (grant no. DQGG0107), National Natural Science Foundation of China (grant nos. 21577126, 41561144004, and 22006030), Initiation Fund for Introducing Talents of Hebei Agricultural University (grant no. 412201904), and Hebei Youth Top Fund (grant no. BJ2020032). Data availability. Ground-based PM_(2.5) measurement data and meteorology measurements are obtained from the China National Environmental Monitoring Centre (http://106.37.208.233:20035/, last access: 1 December 2020) and the National Climate Data Center (NCDC; https://www7.ncdc.noaa.gov/CDO/cdoselect.cmd, last access: 1 December 2020), respectively. Supplement. The supplement related to this article is available online at: https://doi.org/10.5194/acp-20-14787-2020-supplement. Author contributions. SY and PL designed this study. SY, PL, LW, XC, and JHS carried out analyses, interpreted data, and wrote the article. ZL, YiZ, ML, KM, WL, TC, YaZ, and DR contributed to the discussions. The authors declare that they have no conflict of interest. Review statement. This paper was edited by Pedro Jimenez-Guerrero and reviewed by Yuzhong Zhang and one anonymous referee.
Funders:
Funding AgencyGrant Number
Department of Science and Technology (China)2016YFC0202702
Department of Science and Technology (China)2018YFC0213506
Department of Science and Technology (China)2018YFC0213503
National Research Program for Key Issues in Air Pollution Control in ChinaDQGG0107
National Natural Science Foundation of China21577126
National Natural Science Foundation of China41561144004
National Natural Science Foundation of China22006030
Hebei Agricultural University412201904
Hebei Youth Top FundBJ2020032
Issue or Number:23
Record Number:CaltechAUTHORS:20210114-143037999
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210114-143037999
Official Citation:Wang, L., Yu, S., Li, P., Chen, X., Li, Z., Zhang, Y., Li, M., Mehmood, K., Liu, W., Chai, T., Zhu, Y., Rosenfeld, D., and Seinfeld, J. H.: Significant wintertime PM2.5 mitigation in the Yangtze River Delta, China, from 2016 to 2019: observational constraints on anthropogenic emission controls , Atmos. Chem. Phys., 20, 14787–14800, https://doi.org/10.5194/acp-20-14787-2020, 2020.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107486
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:14 Jan 2021 23:08
Last Modified:14 Jan 2021 23:08

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