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首页> 外文期刊>Atmospheric environment >Insights into the temporal and spatial characteristics of PM_(2.5) transport flux across the district, city and region in the North China Plain
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Insights into the temporal and spatial characteristics of PM_(2.5) transport flux across the district, city and region in the North China Plain

机译：考察华北平原地区，城市和地区PM_（2.5）输送通量的时空特征

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The Beijing-Tianjin-Hebei (BTH) region in the North China Plain (NCP) is significantly affected by inter-district, city and region transport, but systematic works on this aspect using flux calculation method remain insufficient. To obtain further insights into the temporal and spatial characteristics of PM2.5 flux, the Weather Research and Forecasting (WRF) model and the Comprehensive Air Quality Model with Extensions (CAMx) have been applied during January, April, July and October 2016. The results demonstrated that the modeling flux calculation method was suitable for investigating the evolutionary trend of PM2.5 flux by comparing cross-district simulations and observations. The total of monthly inflow, outflow and net flux indicated the intensive interactions and prominent temporal and spatial variations of PM2.5 transport though the boundary segment of the district, city and region. The vertical distribution analysis of net flux shows that PM2.5 net flux between target megacity/region and surroundings differed with the altitude, and the altitude at which its maximum intensity was closely related to neighboring areas and occurrence of month. Notably, three main transport pathways during four months have been identified based on the investigation of cross-city transport, namely the northwest-southeast (NW-SE) for January and April, the southeast-northwest (SE-NW) for July and October, the southwest-northeast (SW-NE) for all months, which were further confirmed by cross-region transport. Additionally, summer and winter monsoon have significant influences on the SE-NW and NW-SE pathway, respectively. Furthermore, this research draws upon a typical process of PM2.5 haze episodes from 11 to 17 October in Beijing, Tangshan and Shijiazhuang, with the aim of demonstrating flux intensity variations in different stages of haze episodes. Overall, the evolution of flux intensity at the higher-altitude layer have similar pattern to that of lower-altitude layer, in which the former was approximately 2 times the latter. Furthermore, inter-city transport along the SW-NE pathway played a crucial role before reaching the most severe stage of pollution, while the local emissions were more conductive to forming heavy pollution extremes. Overall, flux intensity calculations provide scientific support to put forward effective joint control measures and acquire a better understanding of evolutionary mechanism of haze episodes in the NCP.
机译：华北平原的北京-天津-河北（BTH）地区受到区域间，城市和区域交通的显着影响，但是使用通量计算方法在这方面的系统工作仍然不足。为了进一步了解PM2.5流量的时空特征，已在2016年1月，4月，7月和10月应用了天气研究和预报（WRF）模型和带有扩展功能的综合空气质量模型（CAMx）。结果表明，通过比较跨区模拟和观测值，建模通量计算方法适合研究PM2.5通量的演变趋势。每月流入，流出和净通量的总和表明，PM2.5穿过区域，城市和地区的边界段时，相互作用强烈，时空变化显着。净通量的垂直分布分析表明，目标特大城市/地区与周围环境之间的PM2.5净通量随海拔高度的不同而不同，其最大强度所在的海拔高度与邻近区域和月份的发生密切相关。值得注意的是，根据对跨城市运输的调查，确定了四个月内的三个主要运输路径，即一月和四月的西北-东南（NW-SE），七月和十月的东南-西北（SE-NW）。 ，即西南-东北（SW-NE）的所有月份，跨区域运输进一步证实了这一点。此外，夏季和冬季季风分别对SE-NW和NW-SE路径有重要影响。此外，本研究借鉴了10月11日至17日在北京，唐山和石家庄发生的PM2.5霾事件的典型过程，目的是证明霾事件不同阶段的通量强度变化。总体而言，高海拔层通量强度的变化与低海拔层的通量强度变化相似，前者约为后者的2倍。此外，沿SW-NE路径的城际运输在达到最严重的污染阶段之前起着至关重要的作用，而当地的排放更有助于形成极端的污染极限。总体而言，通量强度计算为提出有效的联合控制措施提供了科学依据，并更好地了解了NCP中霾事件的演变机理。

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