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As a key determinant of atmospheric oxidation capacity, the hydroxyl radicals (·OH) govern the removal of primary pollutants and the formation of secondary pollutants. This study estimated ·OH levels from 2015 to 2023 using a parameterization approach based on surface air pollutant observations and reanalysis meteorological data. The results showed that daytime ·OH concentration (08:00~18:00) exhibited a single-peak seasonal pattern, with the highest levels occurring in summer and the lowest in winter. The annual mean daytime ·OH concentration displayed a significant upward trend (0.05×10⁶cm^-3a^-1). Spatially, the most rapid increases were found in Handan and Tangshan, while Tianjin exhibited relatively smaller increases. Among seasons, the summertime trend was the most pronounced (0.07×10⁶cm^-3a^-1). At present, ·OH concentrations in the BTH region lie on the declining branch of the nonlinear response curve to nitrogen dioxide (NO₂). Under the present NO₂ levels, continued reductions in NO₂ weaken the dominant ·OH sink reactions, constituting the key chemical mechanism driving the net increase in ·OH concentrations.

, authors=Jing-wen ZHANG¹, Li-yan WEI², Yun-wei LI¹, Shao-chen LIU^{1, 3}, Run LIU^{1, 3, *}, authorsList=Jing-wen ZHANG, Li-yan WEI, Yun-wei LI, Shao-chen LIU, Run LIU, authorCompany=null, correspAuthors=Run LIU, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1314922114688312134, articleId=1314922114184995652, tenantId=1146029695717560320, journalId=1234093305789726721, language=CN, title=2015~2023年京津冀地区的羟基自由基浓度变化特征, columnId=1234106388364981004, journalTitle=中国环境科学, columnName=大气污染与控制, runingTitle=null, highlight=null, articleAbstract=

羟基自由基（·OH）作为决定大气氧化性的关键因子，主导着一次污染物的去除和二次污染物的生成．本研究基于地面污染物观测数据及再分析气象数据，采用参数化方法估算了2015~2023年京津冀地区的·OH浓度．结果表明：·OH日间浓度（08:00~18:00）呈现单峰型分布，夏季浓度高而冬季低．·OH日间年均浓度呈现显著的上升趋势（0.05×10⁶cm^-3a^-1）．空间分布上，邯郸市和唐山市的增速最大，天津市的增速相对较小．季节年际变化上夏季·OH浓度的增速最为显著（0.07×10⁶cm^-3a^-1）．当前京津冀地区的·OH浓度处于其对二氧化氮（NO₂）浓度非线性响应曲线的下降支，在现有的NO₂浓度水平下，其持续降低削弱了·OH的主要汇反应，是驱动·OH净浓度上升的关键化学过程．

, authors=张靖雯¹, 韦丽艳², 李韵唯¹, 刘绍臣^{1, 3}, 刘润^{1, 3, *}, authorsList=张靖雯, 韦丽艳, 李韵唯, 刘绍臣, 刘润, authorCompany=null, correspAuthors=刘润, authorNote=, correspAuthorsNote=, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=i03LHT939faSs/VEGwL/Vg==, magXml=lpkJ93KU5O/VHvEuUfEUXw==, pdfUrl=null, pdf=5y3vBEPQneVNX6Tfl/Xl6w==, pdfFileSize=1599693, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=WVMO7RZDiPYYfQIAiSb90g==, mapNumber=null, fund=null)}, authors=[Author(id=1314922115376178001, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1314922114184995652, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=zjw13680501233@163.com, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1314922115468452691, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1314922114184995652, authorId=1314922115376178001, language=EN, stringName=Jing-wen ZHANG, firstName=Jing-wen, middleName=null, lastName=ZHANG, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=¹, address=^1.College of Environmental and Climate Research, Jinan University, Guangzhou 511443, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1314922115543950164, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1314922114184995652, authorId=1314922115376178001, language=CN, stringName=张靖雯, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=¹, address=^1.暨南大学环境与气候学院，广东 广州 511443, bio={"content":"

张靖雯（2000-），女，广东开平人，暨南大学硕士研究生，主要研究方向为大气氧化性．发表论文1篇．zjw13680501233@163.com.

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张靖雯（2000-），女，广东开平人，暨南大学硕士研究生，主要研究方向为大气氧化性．发表论文1篇．zjw13680501233@163.com.

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