[淮河流域细颗粒物及其化学成分的时空特征和驱动因素]。

Q2 Environmental Science Huanjing Kexue/Environmental Science Pub Date : 2024-10-08 DOI:10.13227/j.hjkx.202312141
Xiao-Yong Liu, Ji-Qiang Niu, Hang Liu, Yi-Dan Zhang, Jun Yan, Jun-Hui Yan, Fang-Cheng Su
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引用次数: 0

摘要

根据淮河流域 35 个城市 2015-2021 年细颗粒物(PM2.5)及其组分数据集,分析了污染物的时空分布规律。及其组分,分析了污染物的时空分布规律。利用随机森林模型研究了气象因子对 PM2.5 浓度的影响。利用 KZ (KZ)模型重建了 PM2.5、硫酸盐(SO42-)、硝酸盐(NO3-)、铵盐(NH4+)、有机物(OM)和黑碳(BC)的原始序列。采用 KZ (Kolmogorov-Zurbenko)滤波和多元线性回归(Multiple滤波和多元线性回归(MLR)来量化气象条件的影响。结果表明,从2015年到2021年,淮河流域PM2.5、SO42-、NO3-、NH4+、OM和BC的下降率分别为4.71、0.99、1.05、0.77、1.01和0.19 μg-(m3-a)-1。PM2.5及其组分的高质量浓度主要集中在人力资源基地的中部和西部地区,而沿海和南部城市的PM2.5及其组分的高质量浓度则较低。35个城市PM2.5的短期、季节和长期成分对原始PM2.5序列的方差贡献率分别为51.6%、35.9%和7.0%。沿海城市的 PM2.5 受短期成分的影响更大。2015年至2018年的气象条件不利于人力资源局PM2.5的下降,而2019年至2021年的气象条件支持PM2.5的下降。2015年至2021年,气象条件对PM2.5、SO42-、NO3-、NH4+、OM和BC长期组分减排的贡献率分别为28.3%、29.1%、31.0%、29.3%、27.8%和28.6%。在安徽、山东、江苏和河南四省的人力资源基地城市,气象条件对 PM2.5 长期下降的贡献率分别为 43.4%、25.6%、25.5% 和 20.6%。随着HRB城市PM2.5浓度的降低,硫氧化率(SOR)显著增加,而氮氧化物氧化率(SOR)则显著降低。明显增加,而氮氧化物氧化率(NOR)变化不大。
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[Spatiotemporal Characterization and Driving Factors of Fine Particulate Matter and Its Chemical Components in the Huaihe River Basin].

According to the data sets of fine particulate matter (PM2.5) and its components in 35 cities in the Huaihe River Basin from 2015 to 2021, the temporal and spatial distribution patterns of pollutants were analyzed. The influence of meteorological factors on PM2.5 concentrations was examined using a random forest model. The original series of PM2.5, sulfate (SO42-), nitrate (NO3-), ammonium salt (NH4+), organic matter (OM), and black carbon (BC) were rebuilt using KZ (Kolmogorov-Zurbenko) filtering and multiple linear regression (MLR) to quantify the effects of meteorological conditions. The results demonstrated that from 2015 to 2021, the declining rates of PM2.5, SO42-, NO3-, NH4+, OM, and BC in the Huaihe River Basin were 4.71, 0.99, 1.05, 0.77, 1.01, and 0.19 μg·(m3·a)-1, respectively. The high mass concentrations of PM2.5 and its components were concentrated in the central and western regions of the HRB, whereas those in coastal and southern cities were lower. The variance contributions of the short-term, seasonal, and long-term components of PM2.5 to the original PM2.5 sequences in 35 cities were 51.6%, 35.9%, and 7.0%, respectively. The PM2.5 in coastal cities were more affected by the short-term components. The meteorological conditions were unfavorable for PM2.5 reduction in the HRB from 2015 to 2018, whereas the meteorological conditions supported the PM2.5 decrease from 2019 to 2021. From 2015 to 2021, the contribution rates of meteorological conditions to the long-term component reductions of PM2.5, SO42-, NO3-, NH4+, OM, and BC were 28.3%, 29.1%, 31.0%, 29.3%, 27.8%, and 28.6%, respectively. The contribution rates of meteorological conditions to the long-term PM2.5 reduction were 43.4%, 25.6%, 25.5%, and 20.6% in the HRB cities in Anhui, Shandong, Jiangsu, and Henan Provinces, respectively. With the decrease in PM2.5 concentration in the HRB, the sulfur oxidation rate (SOR) increased significantly, while the nitrogen oxide oxidation rate (NOR) changed little.

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Huanjing Kexue/Environmental Science
Huanjing Kexue/Environmental Science Environmental Science-Environmental Science (all)
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