Journal of environmental sciences最新文献

{"title":"Temporal-spatial distributions of road silt loadings and fugitive road dust emissions in Beijing from 2019 to 2020","authors":"Haibin Wang ,&nbsp;Lihui Han ,&nbsp;Tingting Li ,&nbsp;Song Qu ,&nbsp;Yuncheng Zhao ,&nbsp;Shoubin Fan ,&nbsp;Tong Chen ,&nbsp;Haoran Cui ,&nbsp;Junfang Liu","doi":"10.1016/j.jes.2022.07.007","DOIUrl":"10.1016/j.jes.2022.07.007","url":null,"abstract":"<div><p>Road silt loading (sL) is an important parameter in the fugitive road dust (FRD) emissions. In this study, the improved Testing Re-entrained Aerosol Kinetic Emissions from Roads (TRAKER) combined with the AP-42 method was firstly developed to quickly measure and estimate the sLs of paved roads in Beijing, China. The annual average sLs in Beijing was 0.59±0.31 g/m² in 2020, and decreased by 22.4% compared with that in 2019. The seasonal variations of sLs followed the order of spring &gt; winter &gt; summer &gt; autumn in the two years. The seasonal mean road sLs on the same type road in the four seasons presented a decline trend from 2019 to 2020, especially on the Express way, decreasing 47.4%-72.7%. The road sLs on the different type roads in the same season followed the order of Major arterial ∼ Minor arterial ∼ Branch road &gt; Express road, and Township road ∼ Country highway &gt; Provincial highway ∼ National highway. The emission intensities of PM₁₀ and PM_2.5 from FRD in Beijing in 2020 were lower than those in 2019. The PM₁₀ and PM_2.5 emission intensities at the four planning areas in the two years all presented the order of the capital functional core area &gt; the urban functional expansion area &gt; the urban development new area &gt; the ecological conservation and development area. The annual emissions of PM₁₀ and PM_2.5 from FRD in Beijing in 2020 were 74,886 ton and 18,118 ton, respectively, decreasing by ∼33.3% compared with those in 2019.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"132 ","pages":"Pages 56-70"},"PeriodicalIF":6.9,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10042858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Co-transformation of HMs-PAHs in rhizosphere soils and adaptive responses of rhizobacteria during whole growth period of rice (Oryza sativa L.)","authors":"Shengwei Yi ,&nbsp;Feng Li ,&nbsp;Chen Wu ,&nbsp;Fei Ge ,&nbsp;Chuang Feng ,&nbsp;Ming Zhang ,&nbsp;Yun Liu ,&nbsp;Hainan Lu","doi":"10.1016/j.jes.2022.07.017","DOIUrl":"10.1016/j.jes.2022.07.017","url":null,"abstract":"<div><p>This study investigated the transformations of heavy metals (HMs) and polycyclic aromatic hydrocarbons (PAHs) in rhizosphere soils and adaptive responses of rhizobacterial community under the real field conditions during four growth stages (e.g., greening, tillering, heading, and maturity) of early rice (Zhongjiazao 17) and late rice (Zhongyou 9918) in Jiangshe village (JSV) and Yangji village (YJV). Results showed that rhizosphere soils of YJV were mildly polluted by Cd and PAHs compared to that of JSV. The relative abundance of bioavailable Cd (bio-Cd) and bioavailable As (bio-As) in rhizosphere soil increased before the heading stage but decreased at the subsequent growth stage, but the content of ΣPAHs in rhizosphere soil decreased gradually during whole growth period. The dominant rhizobacteria genera at YJV (e.g., <em>Bacillus, Massilia, Sphingomonas</em>, and <em>Geobacter</em>) increased at an abundance level from the tillering to heading stage. Rhizobacteria interacted with the above co-pollutant more intensely at the tillering and heading stage, where genes involved in HM-resistance and PAH-degradation appeared to have a significant enhancement. The contents of bio-Cd and bio-As in rhizosphere soil of early rice were higher than that of late rice at each growth stage, especially at the heading stage. Bio-Cd, ΣPAHs, and organic matter were key factors influencing the community structure of rhizobacteria. Results of this study provide valuable insights about the interactions between HM-PAH co-pollutant and rhizobacterial community under real field conditions and thus develop in-situ rhizosphere remediation techniques for contaminated paddy fields.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"132 ","pages":"Pages 71-82"},"PeriodicalIF":6.9,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10042859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exposure to methylparaben at environmentally realistic concentrations significantly impairs neuronal health in adult zebrafish","authors":"Chenyan Hu ,&nbsp;Yachen Bai ,&nbsp;Baili Sun ,&nbsp;Xiangzhen Zhou ,&nbsp;Lianguo Chen","doi":"10.1016/j.jes.2022.07.012","DOIUrl":"10.1016/j.jes.2022.07.012","url":null,"abstract":"<div><p>Methylparaben (MeP) is an emerging aquatic pollutant that is found to impact neural functions. However, it still lacks a comprehensive understanding about its neurotoxicology. The present study exposed adult zebrafish to environmentally realistic concentrations (0, 1, 3, and 10 µg/L) of MeP for 28 days, with objectives to elucidate the neurotoxic effects and mechanisms. Proteomic profiling found that MeP pollutant induced distinct mechanism of neurotoxicity as a function of sex. MeP pollutant appeared to preferentially target the neurotransmission cascade via synapse junctions. In male brain, glutamatergic neural signaling was enhanced by 10 µg/L of MeP in characteristics of higher glutamate neurotransmitter content (by 61.9%) and up-regulated glutamate receptor expression by 2.6-fold relative to the control. In MeP-exposed female brain, biomarker proteins of synapse formation and regeneration had significantly lower abundance, accounting for the blockage of synaptic neurotransmission. Furthermore, under the stress of MeP pollutant, both male and female zebrafish initiated a negative feedback mechanism along stress neuroendocrine axis by down-regulating the transcriptions of corticotropin-releasing hormone and its binding protein, which subsequently decreased blood cortisol concentrations. MeP subchronic exposure also disturbed innate immune function. In particular, significant increases in lipopolysaccharide (LPS) content by 15.6% were caused by MeP exposure in male brain, thereby inducing the synthesis of pro-inflammatory cytokines. In contrast, female brain was able to adaptively up-regulate the protein expression of blood brain barrier to inhibit the infiltration of LPS endotoxin into brain. Overall, the present findings pinpoint the potent neurotoxicity of MeP pollutant even at environmentally realistic concentrations.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"132 ","pages":"Pages 134-144"},"PeriodicalIF":6.9,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9660413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Occurrence of human pathogenic viruses in drinking water and in its sources: A review","authors":"Marco Panizzolo ,&nbsp;Marta Gea ,&nbsp;Elisabetta Carraro ,&nbsp;Giorgio Gilli ,&nbsp;Silvia Bonetta ,&nbsp;Cristina Pignata","doi":"10.1016/j.jes.2022.07.035","DOIUrl":"10.1016/j.jes.2022.07.035","url":null,"abstract":"<div><p><span>Since many waterborne diseases are caused by human pathogenic viruses, virus monitoring of drinking water (DW) and DW sources is crucial for public health. Therefore, the aim of this review was to describe the occurrence of human pathogenic viruses in DW and DW sources; the occurrence of two viruses proposed as novel indicators of human faecal contamination (</span><em>Pepper mild mottle virus</em> and <em>Tobacco mosaic virus</em><span>) was also reported. This research was focused on articles that assessed viral occurrence using molecular methods in the surface water used for DW production<span><span> (SW-D), groundwater used for DW production (GW-D), DW and bottled-DW (BW). A total of 1544 studies published in the last 10 years were analysed, and 79 were ultimately included. In considering the detection methods, filtration is the most common concentration technique, while quantitative polymerase chain reaction is the most common quantification technique. Regarding virus occurrence in SW-D, GW-D, and DW, high percentages of positive samples were reported for </span>adenovirus, polyomavirus and </span></span><em>Pepper mild mottle virus</em><span>. Viral genomes were frequently detected in SW-D and rarely in GW-D, suggesting that GW-D may be a safe DW source. Viral genomes were also detected in DW, posing a possible threat to human health. The lowest percentages of positive samples were found in Europe, while the highest were found in Asia and South America. Only three articles assessed viral occurrence in BW. This review highlights the lack of method standardization and the need for legislation updates.</span></p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"132 ","pages":"Pages 145-161"},"PeriodicalIF":6.9,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9668668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Year-round changes in tropospheric nitrogen dioxide caused by COVID-19 in China using satellite observation","authors":"Zhenyu Luo ,&nbsp;Hailian Xu ,&nbsp;Zhining Zhang,&nbsp;Songxin Zheng,&nbsp;Huan Liu","doi":"10.1016/j.jes.2022.01.013","DOIUrl":"10.1016/j.jes.2022.01.013","url":null,"abstract":"<div><p>The lockdown policy deals a severe blow to the economy and greatly reduces the nitrogen oxides (NOx) emission in China when the coronavirus 2019 spreads widely in early 2020. Here we use satellite observations from Tropospheric Monitoring Instrument to study the year-round variation of the nitrogen dioxide (NO₂) tropospheric vertical column density (TVCD) in 2020. The NO₂ TVCD reveals a sharp drop, followed by small fluctuations and then a strong rebound when compared to 2019. By the end of 2020, the annual average NO₂ TVCD declines by only 3.4% in China mainland, much less than the reduction of 24.1% in the lockdown period. On the basis of quantitative analysis, we find the rebound of NO₂ TVCD is mainly caused by the rapid recovery of economy especially in the fourth quarter, when contribution of industry and power plant on NO₂ TVCD continues to rise. This revenge bounce of NO₂ indicates the emission reduction of NOx in lockdown period is basically offset by the recovery of economy, revealing the fact that China's economic development and NOx emissions are still not decoupled. More efforts are still required to stimulate low-pollution development.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"132 ","pages":"Pages 162-168"},"PeriodicalIF":6.9,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8761557/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9699970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tungsten-based nanocatalysts with different structures for visible light responsive photocatalytic degradation of bisphenol A","authors":"Hai Bang Truong ,&nbsp;Thi Thu Loan Doan ,&nbsp;Nguyen Tien Hoang ,&nbsp;Nguyen Van Tam ,&nbsp;Minh Kim Nguyen ,&nbsp;Le Gia Trung ,&nbsp;Jin Seog Gwag ,&nbsp;Nguyen Tien Tran","doi":"10.1016/j.jes.2023.09.028","DOIUrl":"https://doi.org/10.1016/j.jes.2023.09.028","url":null,"abstract":"<div><p>Environmental pollution, such as water contamination, is a critical issue that must be absolutely addressed. Here, three different morphologies of tungsten-based photocatalysts (WO₃ nanorods, WO₃/WS₂ nanobricks, WO₃/WS₂ nanorods) are made using a simple hydrothermal method by changing the solvents (H₂O, DMF, aqueous HCl solution). The as-prepared nanocatalysts have excellent thermal stability, large porosity, and high hydrophilicity. The results show all materials have good photocatalytic activity in aqueous media, with WO₃/WS₂ nanorods (NRs) having the best activity in the photodegradation of bisphenol A (BPA) under visible-light irradiation. This may originate from increased migration of charge carriers and effective prevention of electron‒hole recombination in WO₃/WS₂ NRs, whereby this photocatalyst is able to generate more reactive •OH and •O₂^– species, leading to greater photocatalytic activity. About 99.6% of BPA is photodegraded within 60 min when using 1.5 g/L WO₃/WS₂ NRs and 5.0 mg/L BPA at pH 7.0. Additionally, the optimal conditions (pH, catalyst dosage, initial BPA concentration) for WO₃/WS₂ NRs are also elaborately investigated. These rod-like heterostructures are expressed as potential catalysts with excellent photostability, efficient reusability, and highly active effectivity in different types of water. In particular, the removal efficiency of BPA by WO₃/WS₂ NRs reduces by only 1.5% after five recycling runs and even reaches 89.1% in contaminated lake water. This study provides promising insights for the nearly complete removal of BPA from wastewater or different water resources, which is advantageous to various applications in environmental remediation.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"139 ","pages":"Pages 569-588"},"PeriodicalIF":6.9,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49764536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Graphitic carbon nitride nanosheets mitigate cadmium toxicity in Glycine max L. by promoting cadmium retention in root and improving photosynthetic performance","authors":"Kai Xu ,&nbsp;Yunyu Guo ,&nbsp;Chenghua Xing ,&nbsp;Ronglong Fu ,&nbsp;Bin Zou ,&nbsp;Rongchuan Liu ,&nbsp;Luyi Cai ,&nbsp;Jianfang Yan ,&nbsp;Xi. Lin Wu ,&nbsp;Miaozhen Cai","doi":"10.1016/j.jes.2023.08.027","DOIUrl":"https://doi.org/10.1016/j.jes.2023.08.027","url":null,"abstract":"<div><p><span>Cadmium (Cd) pollution poses a serious threat to plant growth and yield. Nanomaterials<span> have shown great application potential for alleviation of Cd toxicity to plants. In this study, we applied graphitic carbon nitride nanosheets (g-C</span></span>₃N₄ NSs) for alleviation of Cd-toxicity to soybean (<em>Glycine max</em> L.). The g-C₃N₄<span> NSs supplementation significantly improved plant growth and reduced oxidative damage in the Cd-toxicated soybean seedlings through hydroponic culture. Particularly, the g-C</span>₃N₄ NSs dynamically regulated the root cell wall (RCW) components by increasing pectin content and modifying its demethylation via enhancing pectin methylesterase (PME) activity, therefore greatly enhanced stronger RCW-Cd retention (up to 82.8%) and reduced Cd migration to the shoot. Additionally, the g-C₃N₄ NSs reversed the Cd-induced chlorosis, increased photosynthetic efficiency because of enhancement in F_v/F_m ration, Y(II) and sugars content. These results provide new insights into the alleviation of Cd toxicity to plants by g-C₃N₄ NSs, and shed light on the application of low-cost and environmental-friendly carbon-based NMs for alleviating heavy metal toxicity to plants.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"139 ","pages":"Pages 543-555"},"PeriodicalIF":6.9,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49758174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cerium-modified amorphous manganese oxides for efficient catalytic removal of ozone","authors":"Aijie Wang,&nbsp;Hong Zhao,&nbsp;Yu Wu,&nbsp;Qiuyan Zhang,&nbsp;Chong Han","doi":"10.1016/j.jes.2022.08.021","DOIUrl":"10.1016/j.jes.2022.08.021","url":null,"abstract":"<div><p>Manganese-based catalysts were widely developed for catalytic removal of ozone, and the low stability and water inactivation are major challenges. To improve removal performance of ozone, three methods were applied to modify amorphous manganese oxides, including acidification, calcination and Ce modification. The physiochemical properties of prepared samples were characterized, and the catalytic activity for ozone removal was evaluated. All modification methods can promote the removal of ozone by amorphous manganese oxides, and Ce modification showed the most significant enhancement. It was confirmed that the introduction of Ce markedly changed the amount and property of oxygen vacancies in amorphous manganese oxides. Superior catalytic activity of Ce-MnO<em>_x</em> can be ascribed to its more content and enhanced formation ability of oxygen vacancies, larger specific surface area and higher oxygen mobility. Furthermore, the durability tests under high relative humidity (80%) determined that Ce-MnO<em>_x</em> showed excellent stability and water resistance. These demonstrate the promising potential of amorphously Ce-modified manganese oxides for catalytic removal of ozone.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"131 ","pages":"Pages 151-161"},"PeriodicalIF":6.9,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9523642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Particle number size distributions and formation and growth rates of different new particle formation types of a megacity in China","authors":"Liang Dai ,&nbsp;Yu Zhao ,&nbsp;Lei Zhang ,&nbsp;Dong Chen ,&nbsp;Rongrong Wu","doi":"10.1016/j.jes.2022.07.029","DOIUrl":"10.1016/j.jes.2022.07.029","url":null,"abstract":"<div><p><span>To understand the contribution of new particle formation (NPF) events to ambient fine particle pollution, measurements of particle size distributions<span>, trace gases and meteorological conditions, were conducted at a suburban site (NJU) from October to December 2016 and at an industrial site (NUIST) from September to November 2015 in Nanjing. According to the temporal evolution of the particle size distributions, three types NPF events were observed: typical NPF (Type A), moderate NPF events (Type B) and strong NPF (Type C) events. The favorable conditions for Type A events included low relative humidity, low concentration of pre-existing particles, and high solar radiation. The favorable conditions of Type B events were similar to Type A, except for a higher concentration of pre-existing particles. Type C events were more likely to happen with the higher relative humidity, lower solar radiation and continuous growth of pre-existing particle concentration. The formation rate of 3 nm (</span></span><em>J</em>₃) was the lowest for Type A events and highest for Type C events. In contrast, the growth rates of 10 nm and 40 nm particles were the highest for Type A, and lowest for Type C. Results show that NPF events with only higher <em>J</em>₃<span> would lead to the accumulation of nucleation mode particles. Sulfuric acid was important for the formation of particles but had little effect on the growth of particle size.</span></p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"131 ","pages":"Pages 11-25"},"PeriodicalIF":6.9,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9523644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Concentrations and light absorption properties of PM2.5 organic and black carbon based on online measurements in Lanzhou, China","authors":"Pengfei Chen ,&nbsp;Shichang Kang ,&nbsp;Qinyi Gan ,&nbsp;Ye Yu ,&nbsp;Xianlei Yuan ,&nbsp;Yajun Liu ,&nbsp;Lekhendra Tripathee ,&nbsp;Xiaoxiang Wang ,&nbsp;Chaoliu Li","doi":"10.1016/j.jes.2022.08.007","DOIUrl":"https://doi.org/10.1016/j.jes.2022.08.007","url":null,"abstract":"<div><p>To elucidate the variations in mass concentrations of organic carbon (OC) and black carbon (BC) in PM_2.5 and their light absorption characteristics in Lanzhou, we conducted one-year online measurements by using a newly developed total carbon analyzer (TCA08) coupled with an aethalometer (AE33) from July 2018 to July 2019. The mean OC and BC concentrations were 6.4 ± 4.4 and 2.0 ± 1.3 µg/m³, respectively. Clear seasonal variations were observed for both components, with winter having the highest concentrations, followed by autumn, spring, and summer. The diurnal variations of OC and BC concentrations were similar throughout the year, with daily two peaks occurring in the morning and evening, respectively. A relatively low OC/BC ratio (3.3 ± 1.2, <em>n</em> = 345) were observed, indicating that fossil fuel combustion was the primary source of the carbonaceous components. This is further substantiated by relatively low biomass burning contribution (<em>f</em>_biomass: 27.1% ± 11.3%) to BC using aethalometer based measurement though <em>f</em>_biomass value which increased significantly in winter (41.6% ± 5.7%). We estimated a considerable brown carbon (BrC) contribution to the total absorption coefficient (<em>b</em>_abs) at 370 nm (yearly average of 30.8% ± 11.1%), with a winter maximum of 44.2% ± 4.1% and a summer minimum of 19.2% ± 4.2%. Calculation of the wavelength dependence of total <em>b</em>_abs revealed an annual mean AAE_370-520 value of 4.2 ± 0.5, with slightly higher values in spring and winter. The mass absorption cross-section of BrC also exhibited higher values in winter, with an annual mean of 5.4 ± 1.9 m²/g, reflecting the impact of emissions from increased biomass burning on BrC concentrations.</p></div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"131 ","pages":"Pages 84-95"},"PeriodicalIF":6.9,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49745954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}