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| Spatial and seasonal variation and regionalization of ozone concentrations in China |
| CHENG Lin-jun1,2, WANG Shuai2, GONG Zheng-yu2, YANG Qi1, WANG Ye-yao1,2 |
1. School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China;
2. State Environmental Protection Key Laboratory of Quality Control in Environmental Monitoring, China National Environmental Monitoring Center, Beijing 100012, China |
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Abstract The spatiotemporal variation characteristics of daily maximum eight-hour average ozone concentrations (O3-8h) from 338cities in China during 2016 were analyzed by rotated empirical orthogonal function (REOF) analysis. Based on the results of REOF analysis focusing on pollution seasons (May to October) in 2016, ten regions were identified in China. The temporal variation patterns of ozone in each region were independent with each other, affected by local meteorological, photochemical or pollution features. A rising trend for annual averaged O3-8h was observed during 2014 to 2016 for all regions, except for South China region and the Tibetan Plateau. The regionalization results of ozone were found to be influenced greatly by terrain features, indicating significant terrain and landforms effects on ozone spatial correlations. Among the 10regions, Huanghuai Plain, the North China Plain, Central Yangtze River Plain were realized as priority regions for mitigation strategies, due to their higher ozone concentrations and densely population.
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Received: 26 April 2017
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