计划烧除影响下的大气O_(3)和PM_(2.5)/PM_(10)多尺度互相关性的多重分形表征  

Multifractal Characterization of Multi-scale Cross-correlationsBetween O_(3) and PM_(2.5)/PM_(10) Affected by Planned Burning

作　　者：钟心宇 陈智荣 罗静 梅小莉 樊彬鑫 李友平 刘春琼 ZHONG Xin-yu;CHEN Zhi-rong;LUO Jing;MEI Xiao-li;FAN Bin-xin;LI You-ping;LIU Chun-qiong(College of Mathematics and Statistics,Jishou University,Jishou Hunan 416000,China;College of Environmental Science and Engineering,China West Normal University,Nanchong Sichuan 637009,China)

机构地区：[1]吉首大学数学与统计学院,湖南吉首416000 [2]西华师范大学环境科学与工程学院,四川南充637009

出　　处：《西华师范大学学报（自然科学版）》2024年第5期466-474,共9页Journal of China West Normal University(Natural Sciences)

基　　金：国家自然科学基金项目(52160024);湖南省自然科学基金项目(2022JJ30475);西华师范大学博士科研启动项目(22kE015,22kE016)。

摘　　要：为揭示计划烧除期间烟羽区中O_(3)和二次气溶胶之间的复杂大气光化学行为,基于多重分形去趋势互相关分析(MFDCCA)方法对凉山彝族自治州西昌市5个大气监测点(凉山州政府、青龙寺、邛海宾馆、西昌市政府和长安)不同时间尺度上O_(3)和PM_(2.5)/PM_(10)序列之间互相关性的多重分形强度(Δh)进行研究。结果发现:(1)计划烧除期间(2020年12月—2021年2月和2021年12月—2022年2月)和非计划烧除期间(2016年—2019年同期)各监测点的O_(3)或PM_(2.5)/PM_(10)的日变化规律一致,并且计划烧除期间的O_(3)浓度小于非计划烧除期间,PM_(2.5)/PM_(10)大于非计划烧除期间,其中,青龙寺监测点PM_(2.5)/PM_(10)的增涨幅度最高,而O_(3)浓度的下降幅度最低。(2)各监测点O_(3)和PM_(2.5)/PM_(10)序列之间的互相关性在2016—2022年均具有多重分形特征,各监测点的Δh值均表现出冬春高、夏秋低的季节变化规律,且青龙寺监测点的Δh值最高。(3)各监测点的Δh值均在2020与2021年冬季出现峰值,计划烧除期间的Δh值均高于非计划烧除期间,且青龙寺监测点的增涨幅度最大。研究结果有助于从新的角度理解计划烧除对大气光化学作用的影响,并为进一步研究野火对大气环境的影响并制定相应的措施提供一定的科学依据。To reveal the complex atmospheric photochemical behavior between O_(3) and secondary aerosols in the plume region during the planned burning periods,the multifractal intensity(Δh)of cross-correlations between O_(3) and PM_(2.5)/PM_(10) on different time scales is studied through multifractal detrended cross-correlation analysis(MFDCCA)at five air monitoring points in Xichang of Liangshan Yi autonomous prefecture,including Liangshan prefecture government,Qinglong Temple,Qionghai hotel,Xichang municipal government and Chang'an.The results are as follows:(1)The daily variation pattern of O_(3) and PM_(2.5)/PM_(10) at each monitoring point in planned burning periods(from December 2020 to February 2021 and from December 2021 to February 2022)is consistent with that in unplanned burning periods(the same period during 2016—2019);the concentration of O_(3) in planned burning periods is smaller than that in the unplanned burning periods while PM_(2.5)/PM_(10) value in planned burning periods is greater than that in the unplanned burning periods;Qinglong Temple has the highest increase in PM_(2.5)/PM_(10) and the lowest decrease in O_(3).(2)The cross-correlation between O_(3) and PM_(2.5)/PM_(10) at each monitoring point has shown multifractal features from 2016 to 2022 and the values ofΔh have presented a seasonal variation law of being higher in winter and spring but lower in summer and autumn;Qinglong Temple has the highestΔh value.(3)In the winter of 2020 and 2021,theΔh values in all monitoring points have reached the peak and the values ofΔh in the planned burning periods are higher than those in the unplanned burning periods;the increase ofΔh value in Qinglong Temple is the largest.The results will help to understand the effects of planned burning on atmospheric photochemistry from a new angle and provide a scientific basis for further studying the effects of wildfire on atmospheric environment and formulating corresponding measures.

关 键 词：计划烧除 多重分形去趋势互相关分析 日变化规律 O_(3) PM_(2.5)/PM_(10) 二次气溶胶 西昌市 

分 类 号：X513[环境科学与工程—环境工程]