Open AccessMeteorological conditions contributed to changes in dominant patterns of summer ozone pollution in Eastern China
Author(s) -
Zhicong Yin,
Xuexi Ma
Publication year - 2020
Publication title -
environmental research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.37
H-Index - 124
ISSN - 1748-9326
DOI - 10.1088/1748-9326/abc915
Subject(s) - subtropical ridge , climatology , china , environmental science , subtropics , trough (economics) , pollution , air quality index , east asia , period (music) , air pollution , physical geography , geography , meteorology , geology , precipitation , ecology , physics , macroeconomics , archaeology , fishery , acoustics , economics , biology , chemistry , organic chemistry
Ground-level O 3 pollution has become one of the most consequential air quality problems in China. Many previous studies have addressed the increasing trend of surface O 3 concentrations in Eastern China. In this study, a new feature, i.e. the change in the dominant patterns of surface O 3 , was revealed, and the associated physical mechanisms were analyzed. The impacts of meteorological conditions and anthropogenic emissions were separated, and the change in the O 3 dominant pattern was found to be mainly due to the variability in the meteorological conditions. From 2017 to 2019, the stable confrontation of the western Pacific subtropical high (WPSH) and East Asian deep trough (EADT) was closely related to the south-north covariant pattern of O 3 , because the variability in the meteorological conditions centered on the North China and Huanghuai regions. In the period of 2015–2016, the joint movements of the WPSH and EADT modulated the meteorological anomalies, creating a dipole mode in Eastern China that contributed to out-of-phase variations in O 3 in North China and the Yangtze River Delta.