DOI: 10.1016/j.atmosenv.2017.09.024
Scopus记录号: 2-s2.0-85030460162
论文题名: Influence of the West Pacific subtropical high on surface ozone daily variability in summertime over eastern China
作者: Zhao Z ; , Wang Y
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 170 起始页码: 197
结束页码: 204
语种: 英语
英文关键词: Daily variations
; Eastern China
; Empirical orthogonal functions analysis
; Observations
; Surface ozone
; West Pacific subtropical high
; WPSH index
Scopus关键词: Moisture
; Orthogonal functions
; Tectonics
; Tropics
; Daily variations
; Eastern China
; Empirical Orthogonal Function
; Observations
; Surface ozone
; West pacific
; WPSH index
; Ozone
; ozone
; atmospheric circulation
; cloud cover
; diurnal variation
; eigenvalue
; empirical orthogonal function analysis
; index method
; monsoon
; observational method
; ozone
; precipitation (climatology)
; spatiotemporal analysis
; subtropical region
; water vapor
; air temperature
; Article
; atmosphere
; China
; climate change
; meteorology
; moisture
; precipitation
; priority journal
; summer
; surface property
; ultraviolet radiation
; water vapor
; China
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: The West Pacific subtropical high (WPSH), as one of the most important components of the East Asian summer monsoon (EASM), is the key synoptic-scale circulation pattern influencing summertime precipitation and atmospheric conditions in China. Here we investigate the impacts of the WPSH on surface ozone daily variability over eastern China, using observations from recently established network of ozone monitors and meteorology reanalysis data during summer (June, July, August; JJA) 2014–2016 with a focus on 2014. An empirical orthogonal function (EOF) analysis of daily ozone variations reveals that the dominating eigenvector (EOF1), which contributes a quarter (25.2%) to the total variances, is a marked north-south contrast. This pattern is temporally well correlated (r = −0.66, p < 0.01) with daily anomalies of a normalized WPSH intensity index (WPSH-I). Spatially, the WPSH-I and ozone correlation is positive in North China (NC) but negative in South China (SC), which well correlates with the ozone EOF1 pattern showing the same north-south contrast (r = −0.86, p < 0.01). These associations suggest the dominant component of surface ozone daily variability in eastern China is linked with the variability of the WPSH intensity in that a stronger WPSH leads to a decrease of surface ozone over SC but an increase over NC and vice versa. This is because a stronger WPSH enhances southwesterly transport of moisture into SC, creating such conditions not conducive for ozone formation as higher RH, more cloudiness and precipitation, less UV radiation, and lower temperature. Meanwhile, as most of the rainfall due to the enhanced southwesterly transport of moisture occurs in SC, water vapor is largely depleted in the air masses transported towards NC, creating dry and sunny conditions over NC under a strong WPSH, thereby promoting ozone formation. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82560
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth System Science, Tsinghua University, Beijing, China; Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX, United States
Recommended Citation:
Zhao Z,, Wang Y. Influence of the West Pacific subtropical high on surface ozone daily variability in summertime over eastern China[J]. Atmospheric Environment,2017-01-01,170