globalchange  > 气候变化与战略
DOI: 10.1016/j.atmosenv.2020.117482
Modulation of synoptic circulation to dry season PM2.5 pollution over the Pearl River Delta region: An investigation based on self-organizing maps
Author: Liao Z.; Xie J.; Fang X.; Wang Y.; Zhang Y.; Xu X.; Fan S.
Source Publication: Atmospheric Environment
ISSN: 1352-2310
Publishing Year: 2020
Volume: 230
Language: 英语
Subject Area: Atmospheric recirculation ; PM2.5 pollution ; Scale of atmospheric motion ; Self-organizing map ; Synoptic circulation classification
Abstract: Fine particle (PM2.5) pollution is of concern for the Pearl River Delta (PRD) region, particularly during the dry season (October to March), when the PM2.5 concentrations can exceed Chinese national standards. In part due to sparse observations, the dispersion/transport mechanisms that lead to PM2.5 pollution over the PRD region are not yet fully understood, and the potential synoptic controls have not been investigated. In this study, systematic analyses were conducted using the multisite surface meteorological observations, two-site radiosonde measurements, and regional PM2.5 observations, based on the application of self-organizing map neural network to large-scale mean sea-level pressure (MSLP) data. The results suggested that the relative position of the PRD to high-pressure systems exerted significant effects on the dispersion conditions and the PM2.5 distribution over the PRD region. When cold high pressure invaded, the PRD region was dominated by synoptic-scale northerly flow, which caused southward pollution transport and hence positive PM2.5 anomalies in the coastal area. When cold high pressure weakened and moved eastward, the PRD region was dominated by meso/local-scale flows, resulting in strong atmospheric recirculation and elevated PM2.5 concentrations in the inland area. However, the regional average of PM2.5 concentrations was not sensitive to the changes in synoptic circulation patterns, which implied that the synoptic circulation played roles most in redistributing the air pollutants within the PRD region and hence a regional PM2.5 pollution emission reduction is needed to improve regional air quality. © 2020 Elsevier Ltd
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Document Type: 期刊论文
Appears in Collections:气候变化与战略

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Affiliation: Institute of Urban Meteorology, Chinese Meteorological Administration, Beijing, 100089, China; School of Atmospheric Sciences, Sun Yat-sen University, Guangzhou, 510275, China; Guangdong Provincial Observation and Research Station for Climate Environment and Air Quality Change in the Pearl River Estuary, Key Laboratory of Tropical Atmosphere-Ocean System, Ministry of Education, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519082, China; State Environmental Key Laboratory of Regional Air Quality Monitoring, Guangdong Environmental Monitoring Center, Guangzhou, 510045, China; Guangdong Climate Center, Guangdong Meteorological Service, Guangzhou, 510080, China

Recommended Citation:
Liao Z.,Xie J.,Fang X.,et al. Modulation of synoptic circulation to dry season PM2.5 pollution over the Pearl River Delta region: An investigation based on self-organizing maps[J]. Atmospheric Environment,2020-01-01,230
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