Sheng Xiang, Shaojun Zhang, Peter Brimblecombe, Yu Ting Yu, Kenneth E. Noll, Haobing Liu, Ye Wu, Ke Hao
{"title":"An Integrated Field Study of Turbulence and Dispersion Variations in Road Microenvironments","authors":"Sheng Xiang, Shaojun Zhang, Peter Brimblecombe, Yu Ting Yu, Kenneth E. Noll, Haobing Liu, Ye Wu, Ke Hao","doi":"10.1021/acs.est.4c04217","DOIUrl":null,"url":null,"abstract":"Traffic-related air pollutants (TRAPs) emitted from vehicle tailpipes disperse into nearby microenvironments, posing potential exposure risks. Thus, accurately identifying the emission hotspots of TRAPs is essential for assessing potential exposure risks. We investigated the relationship between turbulent kinetic energy (<i>TKE</i>) and pollutant dispersion (<i>D</i>) through an integrated field measurement. A five-year near-road sampling campaign (5 min based) near a light-duty vehicle-restricted roadway and an on-road sampling campaign (5 s based) on isolated proving grounds were conducted. The <i>D</i> was first calculated based on vehicle emission and pollutant concentrations and then paired with <i>TKE</i> measurements. Here, 198 near-road and 377 on-road measurement pairs were collected. In the near-road measurements, <i>TKE</i> and <i>D</i> showed a positive relationship (<i>R</i><sup>2</sup> ≥ 0.69) with the vehicle flow rate, while they showed similar decay patterns and sensitivity to vehicle types in the on-road measurements. A relationship between <i>TKE</i> and <i>D</i> (<i>TKE</i>-<i>D</i>) was developed through these measurements, demonstrating a robust correlation (<i>R</i><sup>2</sup> ≥ 0.61) and consistent slope values (1.1–1.3). These findings provide field evidence for the positive association between <i>TKE</i> and <i>D</i>, irrespective of the measurement techniques or locations. The <i>TKE</i>-<i>D</i> relationship enables vehicle emission estimation with <i>TKE</i> as the sole input, facilitating the identification of emission hotspots with high spatiotemporal resolution.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":null,"pages":null},"PeriodicalIF":10.8000,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"环境科学与技术","FirstCategoryId":"1","ListUrlMain":"https://doi.org/10.1021/acs.est.4c04217","RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}
引用次数: 0
Abstract
Traffic-related air pollutants (TRAPs) emitted from vehicle tailpipes disperse into nearby microenvironments, posing potential exposure risks. Thus, accurately identifying the emission hotspots of TRAPs is essential for assessing potential exposure risks. We investigated the relationship between turbulent kinetic energy (TKE) and pollutant dispersion (D) through an integrated field measurement. A five-year near-road sampling campaign (5 min based) near a light-duty vehicle-restricted roadway and an on-road sampling campaign (5 s based) on isolated proving grounds were conducted. The D was first calculated based on vehicle emission and pollutant concentrations and then paired with TKE measurements. Here, 198 near-road and 377 on-road measurement pairs were collected. In the near-road measurements, TKE and D showed a positive relationship (R2 ≥ 0.69) with the vehicle flow rate, while they showed similar decay patterns and sensitivity to vehicle types in the on-road measurements. A relationship between TKE and D (TKE-D) was developed through these measurements, demonstrating a robust correlation (R2 ≥ 0.61) and consistent slope values (1.1–1.3). These findings provide field evidence for the positive association between TKE and D, irrespective of the measurement techniques or locations. The TKE-D relationship enables vehicle emission estimation with TKE as the sole input, facilitating the identification of emission hotspots with high spatiotemporal resolution.
期刊介绍:
Environmental Science & Technology (ES&T) is a co-sponsored academic and technical magazine by the Hubei Provincial Environmental Protection Bureau and the Hubei Provincial Academy of Environmental Sciences.
Environmental Science & Technology (ES&T) holds the status of Chinese core journals, scientific papers source journals of China, Chinese Science Citation Database source journals, and Chinese Academic Journal Comprehensive Evaluation Database source journals. This publication focuses on the academic field of environmental protection, featuring articles related to environmental protection and technical advancements.