Regionalization based on spatial and seasonal variation in ground-level ozone concentrations across China

Cheng, Linjun and Wang, Shuai and Gon, Zhengyu and Li, Hong and Yang, Qi and Wang, Yeyao (2018) Regionalization based on spatial and seasonal variation in ground-level ozone concentrations across China. Journal of Environmental Sciences, 67. pp. 179-190. ISSN 1001-0742

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Abstract

Owing to the vast territory of China and strong regional characteristic of ozone pollution, it is desirable for policy makers to have a targeted and prioritized regulation and ozone pollution control strategy in China based on scientific evidences. It is important to assess its current pollution status as well as spatial and temporal variation patterns across China. Recent advances of national monitoring networks provide an opportunity to insight the actions of ozone pollution. Here, we present rotated empirical orthogonal function (REOF) analysis that was used on studying the spatiotemporal characteristics of daily ozone concentrations. Based on the results of REOF analysis in pollution seasons for 3 years' observations, twelve regions with clear patterns were identified in China. The patterns of temporal variation of ozone in each region were separated well and different from each other, reflecting local meteorological, photochemical or pollution features. A rising trend for annual averaged of Eight-hour Average Ozone Concentrations (O3-8 hr) from 2014 to 2016 was observed for all regions, except for the Tibetan Plateau. The mean values of annual and 90 percentile concentrations for all 338 cities were 82.6 ± 14.6 and 133.9 ± 25.8 μg/m3, respectively, in 2015. The regionalization results of ozone were found to be influenced greatly by terrain features, indicating significant terrain and landform effects on ozone spatial correlations. Among the 12 regions, North China Plain, Huanghuai Plain, Central Yangtze River Plain, Pearl River Delta and Sichuan Basin were realized as priority regions for mitigation strategies, due to their higher ozone concentrations and densely population.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Environmental Sciences
Additional Information:
This is the author’s version of a work that was accepted for publication in Journal of Environmental Sciences. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Environmental Sciences, 67, 2018 DOI: 10.1016/j.jes.2017.08.011
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2300/2305
Subjects:
ID Code:
87597
Deposited By:
Deposited On:
01 Nov 2017 16:20
Refereed?:
Yes
Published?:
Published
Last Modified:
27 May 2020 05:35