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Seasonality of carbonaceous aerosol composition and light absorption properties in Karachi,Pakistan

Journal of Environmental Sciences 2020年第4期32卷 286-296页

作者： Pengfei Chen Shichang Kang Chaman Gul lekhendra tripathee Xiaoxiang Wang Zhaofu Hu Chaoliu Li Tao Pu State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and Resources(CAS)Lanzhou 730000ChinaChinese Academy of Sciences CAS Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100101China Key Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau ResearchCASBeijing 100101China Reading Academy Nanjing University of Information Science and TechnologyNanjingJiangsu210044China

Characteristics of carbonaceous aerosol(CA)and its light absorption properties are limited in Karachi,which is one of the most polluted metropolitan cities in South *** study presents a comprehensive measurement of seasonality of CA compositions and mass absorption cross-section(MAC)of elemental carbon(EC)and water-soluble organic carbon(WSOC)in total suspended particles(TSP)collected from February 2015 to March 2017 in the southwest part of *** average TSP,organic carbon(OC),and EC concentrations were extremely high with values as 391.0±217.0,37.2±28.0,and 8.53±6.97μg/m3,*** components showed clear seasonal variations with high concentrations occurring during fall and winter followed by spring and ***42-,NO3-,K+,and NH4+showed similar variations with CA,implying the significant influence on atmospheric pollutants from anthropogenic *** lower OC/EG ratio(4.20±2.50)compared with remote regions further indicates fossil fuel combustion as a primary source of ***,sea salt and soil dust are important contribution sources for *** average MAC of EC(632 nm)and WSOC(365 nm)were 6.56±2.70 and 0.97±0.37 m2/g,*** is comparable to that in urban areas but lower than that in remote regions,indicating the significant influence of local *** showed opposite distribution with EC,further suggesting that OC was significantly affected by local fossil fuel *** addition,dust might be an important factor increasing MACwsoc particularly during spring and summer.

关键词： Air pollution Organic carbon Elemental carbon Light absorption Pakistan

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Nitrogenous and carbonaceous aerosols in PM_(2.5) and TSP during pre-monsoon:Characteristics and sources in the highly polluted mountain valley

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Journal of Environmental Sciences 2022年第5期34卷 10-24页

作者： Hemraj Bhattarai lekhendra tripathee Shichang Kang Pengfei Chen Chhatra Mani Sharma Kirpa Ram Junming Guo Maheswar Rupakheti Earth System Science Programme and Graduate Division of Earth and Atmospheric Sciences The Chinese University of Hong KongHong KongChina State Key Laboratory of Cryospheric Science Northwest Institute of Eco-environment and ResourcesChinese Academy of Sciences(CAS)Lanzhou 730000China Key Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau ResearchCASBeijing 100101China CAS Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100085China Himalayan Environment Research Institute(HERI) Kathmandu 44602Nepal Central Department of Environmental Sciences Tribhuvan UniversityKathmandu 44613Nepal Institute of Environment and Sustainable Development Banaras Hindu UniversityVaranasi 221005India Institute for Advanced Sustainability Studies Potsdam 14467Germany

This study reports for the first time a comprehensive analysis of nitrogenous and carbona-ceous aerosols in simultaneously collected PM_(2.5) and TSP during pre-monsoon(March-May 2018)from a highly polluted urban Kathmandu Valley(KV)of the Himalayan *** mean mass concentration of PM_(2.5)(129.8 μg/m^(3))was only-25%of TSP mass(558.7 μg/m^(3))indicating the dominance of coarser mode ***,the mean concentration as well as fractional contributions of water-soluble total nitrogen(WSTN)and carbonaceous species reveal their predominance in find-mode *** mean mass concentration of WSTN was 17.43±4.70 μg/m^(3)(14%)in PM_(2.5) and 24.64±8.07 μg/m^(3)(5%)in ***,the fractional contribution of total carbonaceous aerosols(TCA)is much higher in PM_(2.5)(~34%)than that in TSP(~20%).The relatively low OC/EC ratio in PM_(2.5)(3.03±1.47)and TSP(4.64±1.73)suggests fossil fuel combustion as the major sources of carbonaceous aerosols with contributions from secondary organic ***-day air mass back trajectories sim-ulated with the HYSPLIT model,together with MODIS fire counts indicate the influence of local emissions as well as transported pollutants from the Indo-Gangetic Plain region to the south of the Himalayan *** component analysis(PCA)also suggests a mixed contribution from other local anthropogenic,biomass burning,and crustal *** re-sults highlight that it is necessary to control local emissions as well as regional transport while designing mitigation measures to reduce the KV's air pollution.

关键词： Nitrogenous aerosol Carbonaceous aerosols Major ions Particulate pollution Kathmandu Valley(KV)

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Deposition of atmospheric pollutant and their chemical characterization in snow pit profile at Dokriani Glacier,Central Himalaya

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Journal of Mountain Science 2018年第10期15卷 2236-2246页

作者： Shipika SUNDRIYAL Tanuj SHUKLA lekhendra tripathee Dwarika Prashad DOBHAL Sameer Kumar TIWARI Uday BHAN Centre for Glaciology Wadia Institute of Himalayan GeologyDehradun-248001UtturakhandIndia National Institute of Hydrology Roorkee-247667UttarakhandIndia Indian Institute oj:Technology Kanpur-208016Uttar PradeshIndia State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou730000China Wadia Institute of Himalayan Geology Dehradun-248001UttarakhandIndia University of Petroleum and Energy Studies BidholiDehradun-248001UttarakhandIndia

The uncertainty in assessing the numerous atmospheric pollutants transported via wind from arid and semi-arid regions is affecting the glacial ecosystem. In our study area due to the complexity of the system, a prominent seasonal difference noticed among major ions(Ca^(2+), Mg^(2+), SO_4^(2-), and NO_3^-). There is a need for understanding the ions cycling as a whole and the directionality of the feedback loops in the system. Therefore, we provide an appraisal of our current hypothesis for seasonal difference in major ion concentration from snow samples for two corresponding years(2013 and 2015) at Dokriani Glacier. A systematic study of chemical compositionsin the shallow snow pit from Dokriani Glacier was undertaken for the pre-monsoon season to understand the cycling of major ions from atmosphere to solute acquisition process. The intimating connections of ions cycling in snow and its temporal behavior was observed and analyzed through various statistical tests. Among major ions, the SO_4^(2-)has the highest concentration among anions on an average considered as 14.21% in 2013 and 29.46% in 2015. On the other side Ca^(2+) is the dominant cation contributing 28.22% in 2013 and 15.3% in 2015 on average. The average ratio of Na+/Cl-was higher in 2013 whereas lower in 2015. The backward trajectory analysis suggests the possible sources of the ions transported from Central Asia through the Western Disturbance(WD) as a prominent source of winter precipitation mainly in the Central Himalaya. Ionicconcentration of Ca^(2+) in cations was highly dominated while in anion SO_4^(2-)played the major role. Factor analysis and correlation matrix suggested that, the precipitation chemistry is mostly influenced by anthropogenic, crustal, and sea salt sources over the studied region. The elemental cycling through ocean, atmosphere and biosphere opens up new ways to understand the geochemical processes operating at the glacierized catchments of the Himalaya. Moreover, increasing the

关键词： Western disturbance Central Himalaya Factor analysis Correlation analysis Snow Stratigraphy Atmospheric pollutants

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Concentration,sources and wet deposition of dissolved nitrogen and organic carbon in the Northern Indo-Gangetic Plain during monsoon

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Journal of Environmental Sciences 2021年第4期33卷 37-52页

作者： Hemraj Bhattarai lekhendra tripathee Shichang Kang Chhatra Mani Sharma Pengfei Chen Junming Guo Prakriti Sharma Ghimire Earth System Science Programme and Graduate Division of Earth and Atmospheric Sciences The Chinese University of Hong KongHong KongChina State Key Laboratory of Cryospheric Science Northwest Institute of Eco-environment and ResourcesChinese Academy of Sciences(CAS)Lanzhou 730000China Key Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau ResearchCASBeijing 100101China Chinese Academy of Sciences(CAS)Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100085China Himalayan Environment Research Institute(HERI) KathmanduNepal Central Department of Environmental Science Tribhuvan UniversityKathmanduNepal Kathmandu Center for Research and Education(KCRE) KathmanduNepal

Precipitation represents an important phenomenon for carbon and nitrogen ***,the concentrations and fluxes of dissolved organic carbon(DOC)and total dissolved nitrogen(TDN)with their potential sources were analyzed in wet precipitation during summer monsoon from the Northern Indo-Gangetic Plain(IGP),important but neglected *** volume-weighted mean(VWM)concentration of DOC and TDN were 687.04 and 1210.23μg/L,***,the VWM concentration of major ions were in a sequence of NH_(4)^(+)>Ca^(2+)>SO_(4)^(2-)>Na^(+)>K^(+)>NO_(3)~->Cl~->Mg^(2+)>F~->NO_(2)~-,suggesting NH_(4)^(+)and Ca^(2+)from agricultural activities and crustal dust played a vital role in precipitation ***,the wet deposition flux of DOC and TDN were 9.95 and 17.06 kg/(ha year),*** wet deposition flux of inorganic nitrogen species such as NH_(4)^(+)-N and NO_(3)^(-)-N were 14.31 and 0.47 kg/(ha year),respectively,demonstrating the strong influence of emission sources and precipitation *** attribution from different analysis suggested the influence of biomass burning on DOC and anthropogenic activities(agriculture,animal husbandry)on nitrogenous *** air-mass back trajectory analysis indicated the influence of air masses originating from the Bay of Bengal,which possibly carried marine and anthropogenic pollutants along with the biomass burning emissions to the sampling *** study bridges the data gap in the less studied part of the northern IGP region and provides new information for policy makers to deal with pollution control.

关键词： Precipitation chemistry Dissolved organic carbon Total dissolved nitrogen Major ions Indo-Gangetic Plain

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Atmospheric particle-bound polycyclic aromatic compounds over two distinct sites in Pakistan:Characteristics,sources and health risk assessment

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Journal of Environmental Sciences 2022年第2期34卷 1-15页

作者： Linda Maharjan Shichang Kang lekhendra tripathee Chaman Gul Huijun Zheng Quanlian Li Pengfei Chen Mukesh Rai Ewerton Santos State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Chinese Academy of Sciences(CAS)Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100085China Himalayan Environment Research Institute Kathmandu 44600Nepal Reading Academy Nanjing University of Information Science&TechnologyNanjingJiangsu 210044China Departamento de Quimica Universidade Federal de SergipeSao CristovaoSergipe SE 49100-000Brazil

Much attention is drawn to polycyclic aromatic hydrocarbons(PAHs)as an air pollutant due to their toxic,mutagenic and carcinogenic ***,to understand the levels,seasonality,sources and potential health risk of PAHs in two distinct geographical locations at Karachi and Mardan in Pakistan,total suspended particle(TSP)samples were collected for over one year *** average total PAH concentrations were 31.5±24.4 and 199±229 ng/m^(3) in Karachi and Mardan,*** significantly lower concentration in Karachi was attributed to diffusion and dilution of the PAHs by the influence of clean air mass from the Arabian sea and high temperature,enhancing the volatilization of the particle phase PAHs to the gas ***,the higher concentration(^(-)6 times)in Mardan was due to large influence from local and regional emission sources.A clear seasonality was observed at both the sites,with the higher values in winter and post-monsoon due to higher emissions and less scavenging,and lower values during monsoon season due to the dilution *** ratios and principal component analysis indicated that PAHs in both sites originated from traffic and mixed combustion sources(fossil fuels and biomass).The average total Ba P equivalent concentrations(Ba P eq)in Karachi and Mardan were 3.26 and 34 ng/m^(3),respectively,which were much higher than the WHO guideline of 1 ng/m^(3).The average estimates of incremental lifetime cancer risk from exposure to airborne Ba P eq via inhalation indicated a risk to human health from atmospheric PAHs at both sites.

关键词： Total suspended particle Polycyclic aromatic hydrocarbons Sources Human health risk

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Trace elements and rare earth elements in wet deposition of Lijiang,*** region,southeastern edge of the Tibetan Plateau

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Journal of Environmental Sciences 2017年第2期29卷 18-28页

作者： Junming Guo Shichang Kang Jie Huang Mika Sillanpaa Hewen Niu Xuejun Sun Yuanqing He Shijing Wang lekhendra tripathee Key Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau ResearchChinese Academy of Sciences(CAS)Beijing 100101China State Key Laboratory of Cryospheric Sciences Cold and Arid Regions Environmental and Engineering of Research InstituteCASLanzhou 730000China CAS Center for Excellence in Tibetan Plateau Earth Sciences Beijing100101China Laboratory of Green Chemistry Lappeenranta Uniuersity of TechnologyMikkeli 50130Finland University of Chinese Academy of Sciences Beijing 100049China

In order to investigate the compositions and wet deposition fluxes of trace elements and rare earth elements（REEs） in the precipitation of the southeastern edge of the Tibetan Plateau, 38 precipitation samples were collected from March to August in 2012 in an urban site of Lijiang city in the Mt. Yulong region. The concentrations of most trace elements and REEs were higher during the non-monsoon season than during the monsoon season,indicating that the lower concentrations of trace elements and REEs observed during monsoon had been influenced by the dilution effect of increased precipitation. The concentrations of trace elements in the precipitation of Lijiang city were slightly higher than those observed in remote sites of the Tibetan Plateau but much lower than those observed in the metropolises of China, indicating that the atmospheric environment of Lijiang city was less influenced by anthropogenic emissions, and, as a consequence, the air quality was still relatively good. However, the results of enrichment factor and principal component analysis revealed that some anthropogenic activities（e.g., the increasing traffic emissions from the rapid development of tourism） were most likely important contributors to trace elements, while the regional/local crustal sources rather than anthropogenic activities were the predominant contributors to the REEs in the wet deposition of Lijiang city. Our study was relevant not only for assessing the current status of the atmospheric environment in the Mt. Yulong region, but also for specific management actions to be implemented for the control of atmospheric inputs and the health of the environment for the future.

关键词： Trace elements Rare earth elements Wet deposition Seasonal variation Lijiang city Tibetan Plateau

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Concentrations and light absorption properties of PM_(2.5) organic and black carbon based on online measurements in Lanzhou, China

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Journal of Environmental Sciences 2023年第9期131卷 84-95页

作者： Pengfei Chen Shichang Kang Qinyi Gan Ye Yu Xianlei Yuan Yajun Liu lekhendra tripathee Xiaoxiang Wang Chaoliu Li State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of Sciences(CAS)Lanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China College of Earth and Environmental Sciences Lanzhou UniversityLanzhou 730000China Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions Northwest Institute of Eco-Environment and ResourcesCASLanzhou 730000China Xinjiang Bayingolin Mongolian Autonomous Prefecture Meteorological Bureau Korla 841000China

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 *** mean OC and BC concentrations were 6.4±4.4 and 2.0±1.3μg/m^(3),*** seasonal variations were observed for both components,with winter having the highest concentrations,followed by autumn,spring,and *** 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,n=345)were observed,indicating that fossil fuel combustion was the primary source of the carbonaceous *** is further substantiated by relatively low biomass burning contribution(f_(biomass):27.1%±11.3%)to BC using aethalometer based measurement though f_(biomass) value which increased significantly in winter(41.6%±5.7%).We estimated a considerable brown carbon(BrC)contribution to the total absorption coefficient(b_(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 b_(abs) revealed an annual mean AAE_(370-520) value of 4.2±0.5,with slightly higher values in spring and *** mass absorption cross-section of BrC also exhibited higher values in winter,with an annual mean of 5.4±1.9 m^(2)/g,reflecting the impact of emissions from increased biomass burning on BrC concentrations.

关键词： Black carbon Brown carbon Light absorption Source Lanzhou

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Carbonaceous aerosol transport from the Indo-Gangetic Plain to the Himalayas:Carbon isotope evidence and light absorption characteristics

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Geoscience Frontiers 2023年第2期14卷 105-115页

作者： Pengfei Chen Shichang Kang Chaoliu Li Zhaofu Hu lekhendra tripathee Mukesh Rai Tao Pu Xiufeng Yin Örjan Gustafsson State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of Sciences(CAS)Lanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Department of Environmental Science The Bolin Centre for Climate ResearchStockholm UniversityStockholm 10691Sweden The Bolin Centre for Climate Research Stockholm UniversityStockholm 10691Sweden

The Indo-Gangetic Plain(IGP)is a major regional and global emitter of atmospheric pollutants,which adversely affect surrounding areas such as the *** present a comprehensive dataset on carbonaceous aerosol(CA)composition,radiocarbon(D14C)-based source apportionment,and light absorption of total suspended particle(TSP)samples collected over a 3-year period from high-altitude Jomsom in the central *** 3-year mean TSP,organic carbon(OC),and elemental carbon(EC)concentrations were 92.0±28.6,9.74±6.31,and 2.02±1.35 lg m^(3),respectively,with the highest concentrations observed during the pre-monsoon season,followed by the post-monsoon,winter,and monsoon *** △^(14)C analysis revealed that the contribution of fossil fuel combustion(ffossil)to EC was 47.9%±11.5%,which is consistent with observations in urban and remote regions in South Asia and attests that EC likely arrives in Jomsom from upwind IGP sources via long-range *** addition,the lowest f_(fossil)(38.7%±13.3%)was observed in winter,indicating large contributions in this season from local biomass *** mass absorption cross-section of EC(MACEC:8.27±1.76 m^(2)/g)and watersoluble organic carbon(MACWSOC:0.98±0.45 m^(2)/g)were slightly higher and lower than those reported in urban regions,respectively,indicating that CA undergo an aging *** aerosol coating during transport and variation of biomass burning probably led to the seasonal variation in MAC of two ***,WSOC contributed considerably to the light absorption(11.1%±4.23%)of *** findings suggest that to protect glaciers of the Himalayas from pollution-related melting,it is essential to mitigate emissions from the IGP.

关键词： Carbonaceous aerosol Long-range transport Carbon isotope Source apportionment Light absorption The Himalayas

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Atmospheric particle-bound mercury in the northern Indo-Gangetic Plain region:Insights into sources from mercury isotope analysis and influencing factors

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Geoscience Frontiers 2022年第1期13卷 85-95页

作者： Junming Guo lekhendra tripathee Shichang Kang Qianggong Zhang Jie Huang Chhatra Mani Sharma Pengfei Chen Rukumesh Paudyal Dipesh Rupakheti State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Himalayan Environment Research Institute(HERI) KathmanduNepal Key Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100039China Central Department of Environmental Science Tribhuvan UniversityKathmanduNepal

Lumbini is a world heritage site located in the southern plains region of Nepal, and is regarded as a potential site for evaluating transboundary air pollution due to its proximity to the border with India. In this study, 82 aerosol samples were collected between April 2013 and July 2014 to investigate the levels of particulate-bound mercury(PBM) and the corresponding seasonality, sources, and influencing *** PBM concentration in total suspended particulate(TSP) matter ranged from 6.8 pg m^(-3) to351.7 pg m^(-3)(mean of 99.7 ± 92.6 pg m^(-3)), which exceeded the ranges reported for remote and rural sites worldwide. The Hg content(PBM/TSP) ranged from 68.2 ng g^(-1) to 1744.8 ng g^(-1)(mean of 446.9 ±312.7 ng g^(-1)), indicating anthropogenic enrichment. The PBM levels were higher in the dry season(i.e.,winter and the pre-monsoon period) than in the wet season(i.e., the monsoon period). In addition, the δ^(202) Hg signature indicated that waste/coal burning and traffic were the major sources of Hg in Lumbini during the pre-monsoon period. Meanwhile, precipitation occurring during photochemical processes in the atmosphere may have been responsible for the observed Δ^(199) Hg values in the aerosol samples obtained during the monsoon period. The PBM concentration was influenced mostly by the resuspension of polluted dust during dry periods and crop residue burning during the post-monsoon period. The estimated PBM deposition flux at Lumbini was 15.7 lg m^(-2) yr^(-1). This study provides a reference dataset of atmospheric PBM over a year, which can be useful for understanding the geochemical cycling of Hg in this region of limited data.

关键词： Particle-bound mercury Seasonality Mercury isotopes Deposition flux Indo-Gangetic Plain

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Modification and coupled use of technologies are an essential envisioned need for bioaerosol study - An emerging public health concern

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Fundamental Research 2022年第2期2卷 218-221页

作者： Prakriti Sharma Ghimire lekhendra tripathee Shichang Kang State Key Laboratory of Cryospheric Science Northwest Institute of Eco-environment and ResourcesChinese Academy of Sciences(CAS)Lanzhou 730000China Himalayan Environment Research Institute(HERI) Kathmandu 44602Nepal University of Chinese Academy of Sciences Beijing 100864China

The airborne microbiome is one of the relevant topics in ecology,biogeochemistiy,environment,and human *** are ubiquitous air pollutants that play a vital role in the linking of the ecosystem with the biosphere,atmosphere,climate,and public ***,the sources,abundance,composition,properties,and atmospheric transport mechanisms of bioaerosols are not clearly *** screen the effects of climate change on aerosol microbial composition and its consequences for human health,it is first essential to develop standards that recognize the existing microbial components and how they vary *** particles can be considered an information-rich unit comprising diverse cellular and protein materials emitted by humans,animals,and ***,no single standard technique can satisfactorily extract the required information about *** account for these issues,metagenomics,mass spectrometry,and biological and chemical analyses can be combined with climatic studies to understand the physical and biological relationships among *** can be achieved by strengthening interdisciplinary teamwork in biology,chemistry,earth science,and life sciences and by sharing knowledge and expertise ***,the coupled use of various advanced analytical approaches is the ultimate key to opening up the biological treasure that lies in the environment.

关键词： Bioaerosols Environment Bioaerosol measurement Public health concern Airborne microbiology

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