Abstract
Particulate n-alkanes are major constituents of organic aerosols (OA). Being primary in origin, chemically stable and thus long-lived, n-alkanes retains source signatures and along with diagnostic parameters have extensively been used to identify source(s) of OA. Systematic, yearlong study was carried out in the Dhauladhar region of North-Western Himalaya (NWH) to investigate dynamics in the composition and concentration of aerosol-associated n-alkanes. PM10 samples were collected for 24 h, once every week, at an urban mid-altitude location (Dharamshala) and a rural low-altitude site (Pohara). Particulate bound n-alkanes were identified and quantified using thermal desorption gas chromatography mass spectrometry (TD-GCMS). Annual mean concentrations of total n-alkanes (TNA) were 211 ± 99 ng m−3 and 223 ± 83 ng m−3, while mass fractions of TNA in PM10 were 4410 ± 1759 ppm and 3622 ± 1243 ppm at Dharamshala and Pohara, respectively. At both sites, a slight dominance of odd carbon-numbered n-alkanes was noticed. The TNA concentration and associated diagnostic parameters indicated unique source profiles at rural and urban locations. Significant seasonal variations were attributed to the contrasting land-use settings and meteorological variations. Influence of petrogenic contributions at urban location and predominance of biogenic contributions at rural location were observed in spring and autumn seasons. Preliminary insights on sources of organic aerosols are presented here. The diagnostic parameters allowed apportionment of biogenic and petrogenic sources. Biogenic emissions from agricultural practices viz. harvesting and threshing were predominant in the rural settings, while tourism-led anthropogenic contributions significantly add to petrogenic contributions in urban environment of the NWH region.
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References
Abas, M. R. B., & Simoneit, B. R. T. (1996). Composition of extractable organic matter of air particles from Malaysia: initial study. Atmospheric Environment, 30(15), 2779–2793. https://doi.org/10.1016/1352-2310(95)00336-3.
AC Nielsen, & ORG-Marg. (2015). Tourism Survey for the State Of Himachal Pradesh (April 2011 – March 2012). http://tourism.gov.in/sites/default/files/Other/Himachal Pradesh Final Report_ new.pdf.
Alves, C. A. (2008). Characterisation of solvent extractable organic constituents in atmospheric particulate matter: an overview. Anais da Academia Brasileira de Ciências, 80(1), 21–82. https://doi.org/10.1590/s0001-37652008000100003.
Alves, C., Nunes, T., Vicente, A., Gonçalves, C., Evtyugina, M., Marques, T., Pio, C., & Bate-Epey, F. (2014). Speciation of organic compounds in aerosols from urban background sites in the winter season. Atmospheric Research, 150, 57–68. https://doi.org/10.1016/j.atmosres.2014.07.012.
Alves, C. A., Vicente, A., Evtyugina, M., Pio, C. A., Hoffer, A., Kiss, G., et al. (2009). Characterisation of hydrocarbons in atmospheric aerosols from different European sites. World Academy of Science, Engineering and Technology, 57, 236–242.
Andreou, G., Alexiou, S. D., Loupa, G., & Rapsomanikis, S. (2007). Identification, abundance and origin of aliphatic hydrocarbons in the fine atmospheric particulate matter of Athens, Greece. Water, Air, & Soil Pollution: Focus, 8(1), 99–106. https://doi.org/10.1007/s11267-007-9142-xARLNOAAhttps://www.ready.noaa.gov/READYamet.php.
Boreddy, S. K. R., Haque, M. M., Kawamura, K., Fu, P., & Kim, Y. (2018). Homologous series of n-alkanes (C19-C35), fatty acids (C12-C32) and n-alcohols (C8-C30) in atmospheric aerosols from central Alaska: molecular distributions, seasonality and source indices. Atmospheric Environment, 184(November 2017), 87–97. https://doi.org/10.1016/j.atmosenv.2018.04.021.
Bray, E. E., & Evans, E. D. (1961). Distribution of n-paraffins as a clue to recognition of source beds. Geochimica et Cosmochimica Acta, 22(1), 2–15. https://doi.org/10.1016/0016-7037(61)90069-2.
Census of India. (2011). http://www.censusindia.gov.in/2011census/population_enumeration.html
Central Pollution Control Board. (2011). Guidelines for the Measurement of Ambient Air Pollutants. http://www.cpcb.nic.in
Chen, Y., Cao, J., Zhao, J., Xu, H., Arimoto, R., Wang, G., Han, Y., Shen, Z., & Li, G. (2014). N-alkanes and polycyclic aromatic hydrocarbons in total suspended particulates from the southeastern Tibetan Plateau: concentrations, seasonal variations, and sources. Science of the Total Environment, 470–471, 9–18. https://doi.org/10.1016/j.scitotenv.2013.09.033.
Cheung, K., Olson, M. R., Shelton, B., Schauer, J. J., & Sioutas, C. (2012). Seasonal and spatial variations of individual organic compounds of coarse particulate matter in the Los Angeles Basin. Atmospheric Environment, 59, 1–10. https://doi.org/10.1016/j.atmosenv.2012.05.037.
Choi, J.-K., Ban, S.-J., Kim, Y.-P., Kim, Y.-H., Yi, S.-M., & Zoh, K.-D. (2015). Molecular marker characterization and source appointment of particulate matter and its organic aerosols. Chemosphere, 134, 482–491. https://doi.org/10.1016/j.chemosphere.2015.04.093.
Chowdhury, Z., Zheng, M., Schauer, J. J., Sheesley, R. J., Salmon, L. G., Cass, G. R., & Russell, A. G. (2007). Speciation of ambient fine organic carbon particles and source apportionment of PM 2.5 in Indian cities. Journal of Geophysical Research, 112(D15), D15303. https://doi.org/10.1029/2007JD008386.
Chrysikou, L. P., & Samara, C. A. (2009). Seasonal variation of the size distribution of urban particulate matter and associated organic pollutants in the ambient air. Atmospheric Environment, 43(30), 4557–4569. https://doi.org/10.1016/j.atmosenv.2009.06.033.
Dimri, A. P., & Dash, S. K. (2012). Wintertime climatic trends in the western Himalayas. Climatic Change, 111(3–4), 775–800. https://doi.org/10.1007/s10584-011-0201-y.
Fu, P. Q., Kawamura, K., Pavuluri, C. M., Swaminathan, T., & Chen, J. (2010). Molecular characterization of urban organic aerosol in tropical India: contributions of primary emissions and secondary photooxidation. Atmospheric Chemistry and Physics, 10(6), 2663–2689. https://doi.org/10.5194/acp-10-2663-2010.
Gadi, R., Shivani, Sharma, S. K., & Mandal, T. K. (2019). Source apportionment and health risk assessment of organic constituents in fine ambient aerosols (PM2.5): a complete year study over National Capital Region of India. Chemosphere, 221, 583–596. https://doi.org/10.1016/j.chemosphere.2019.01.067.
Giri, B., Patel, K. S., Jaiswal, N. K., Sharma, S., Ambade, B., Wang, W., Simonich, S. L. M., & Simoneit, B. R. T. (2013). Composition and sources of organic tracers in aerosol particles of industrial central India. Atmospheric Research, 120–121, 312–324. https://doi.org/10.1016/j.atmosres.2012.09.016.
Gonçalves, C., Figueiredo, B. R., Alves, C. A., Cardoso, A. A., & Vicente, A. M. (2017). Size-segregated aerosol chemical composition from an agro-industrial region of São Paulo state, Brazil. Air Quality, Atmosphere and Health, 10(4), 483–496. https://doi.org/10.1007/s11869-016-0441-0.
Gupta, S., Gadi, R., Sharma, S. K., & Mandal, T. K. (2018). Characterization and source apportionment of organic compounds in PM10 using PCA and PMF at a traffic hotspot of Delhi. Sustainable Cities and Society, 39, 52–67. https://doi.org/10.1016/j.scs.2018.01.051.
Hegde, P., Kawamura, K., Joshi, H., & Naja, M. (2016). Organic and inorganic components of aerosols over the central Himalayas: winter and summer variations in stable carbon and nitrogen isotopic composition. Environmental Science and Pollution Research, 23(7), 6102–6118. https://doi.org/10.1007/s11356-015-5530-3.
Herlekar, M., Joseph, A. E., Kumar, R., & Gupta, I. (2012). Chemical speciation and source assignment of particulate (PM10) phase molecular markers in Mumbai. Aerosol and Air Quality Research, 12(6), 1247–1260. https://doi.org/10.4209/aaqr.2011.07.0091.
Hildemann, L. M., Markowski, G. R., & Cass, G. R. (1991). Chemical composition of emissions from urban sources of fine organic aerosol. Environmental Science and Technology, 25(4), 744–759.
Hildemann, L. M., Rogge, W. F., Cass, G. R., Mazurek, M. A., & Simoneit, B. R. T. (1996). Contribution of primary aerosol emissions from vegetation-derived sources to fine particle concentrations in Los Angeles. Journal of Geophysical Research-Atmospheres, 101(14), 19541–19549.
Huma, B., Yadav, S., & Attri, A. K. (2016). Profile of particulate-bound organic compounds in ambient environment of Srinagar: a high-altitude urban location in the North-Western Himalayas. Environmental Science and Pollution Research, 23(8), 7660–7675. https://doi.org/10.1007/s11356-015-5994-1.
Javed, W., Iakovides, M., Garaga, R., Stephanou, E. G., Kota, S. H., Ying, Q., Wolfson, J. M., Koutrakis, P., & Guo, B. (2019). Source apportionment of organic pollutants in fine and coarse atmospheric particles in Doha, Qatar. Journal of the Air & Waste Management Association, 69(11), 1277–1292. https://doi.org/10.1080/10962247.2019.1640803.
Jeng, W.-L. (2006). Higher plant n-alkane average chain length as an indicator of petrogenic hydrocarbon contamination in marine sediments. Marine Chemistry, 102(3–4), 242–251. https://doi.org/10.1016/j.marchem.2006.05.001.
Kang, M., Fu, P., Aggarwal, S. G., Kumar, S., Zhao, Y., Sun, Y., & Wang, Z. (2016). Size distributions of n-alkanes, fatty acids and fatty alcohols in springtime aerosols from New Delhi, India. Environmental Pollution, 219, 957–966. https://doi.org/10.1016/j.envpol.2016.09.077.
Kang, M., Ren, L., Ren, H., Zhao, Y., Kawamura, K., Zhang, H., Wei, L., Sun, Y., Wang, Z., & Fu, P. (2018). Primary biogenic and anthropogenic sources of organic aerosols in Beijing, China: Insights from saccharides and n-alkanes. Environmental Pollution, 243, 1579–1587. https://doi.org/10.1016/j.envpol.2018.09.118.
Kaushal, D., Kumar, A., Yadav, S., Tandon, A., & Attri, A. K. (2018). Wintertime carbonaceous aerosols over Dhauladhar region of North-Western Himalayas. Environmental Science and Pollution Research, 25(8), 8044–8056. https://doi.org/10.1007/s11356-017-1060-5.
Kreidenweis, S. M., Petters, M., & Lohmann, U. (2018). 100 years of Progress in cloud physics, aerosols, and aerosol chemistry research. Meteorological Monographs, 59, 11.1–11.72. https://doi.org/10.1175/AMSMONOGRAPHS-D-18-0024.1.
Kumar, A., & Attri, A. K. (2016). Biomass combustion a dominant source of carbonaceous aerosols in the ambient environment of Western Himalayas. Aerosol and Air Quality Research, 16(3), 519–529. https://doi.org/10.4209/aaqr.2015.05.0284.
Kuniyal, J. C., Sharma, M., Chand, K., & Mathela, C. S. (2015). Water soluble ionic components in particulate matter (PM 10) during high pollution episode days at Mohal and Kothi in the North-Western Himalaya, India. Aerosol and Air Quality Research, 15(2), 529–543. https://doi.org/10.4209/aaqr.2013.09.0297.
Lyu, R., Shi, Z., Alam, M. S., Wu, X., Liu, D., Vu, T. V., Stark, C., Xu, R., Fu, P., Feng, Y., & Harrison, R. M. (2019). Alkanes and aliphatic carbonyl compounds in wintertime PM2.5 in Beijing, China. Atmospheric Environment, 202(January), 244–255. https://doi.org/10.1016/j.atmosenv.2019.01.023.
Lyu, Y., Xu, T., Yang, X., Chen, J., Cheng, T., & Li, X. (2017). Seasonal contributions to size-resolved n-alkanes (C8–C40) in the Shanghai atmosphere from regional anthropogenic activities and terrestrial plant waxes. Science of the Total Environment, 579, 1918–1928. https://doi.org/10.1016/j.scitotenv.2016.11.201.
Mauderly, J. L., & Chow, J. C. (2008). Health effects of organic aerosols. Inhalation Toxicology, 20(3), 257–288. https://doi.org/10.1080/08958370701866008.
Nelson, D. B., Knohl, A., Sachse, D., Schefuß, E., & Kahmen, A. (2017). Sources and abundances of leaf waxes in aerosols in central Europe. Geochimica et Cosmochimica Acta, 198, 299–314. https://doi.org/10.1016/j.gca.2016.11.018.
Pandis, S. N., Donahue, N. M., Murphy, B. N., Riipinen, I., Fountoukis, C., Karnezi, E., Patoulias, D., & Skyllakou, K. (2013). Introductory lecture: Atmospheric organic aerosols: insights from the combination of measurements and chemical transport models. Faraday Discussions, 165, 9–24. https://doi.org/10.1039/c3fd00108c.
Pant, P., Shukla, A., Kohl, S. D., Chow, J. C., Watson, J. G., & Harrison, R. M. (2015). Characterization of ambient PM2.5 at a pollution hotspot in New Delhi, India and inference of sources. Atmospheric Environment, 109, 178–189. https://doi.org/10.1016/j.atmosenv.2015.02.074.
Pio, C., Alves, C., & Duarte, A. (2001). Identification, abundance and origin of atmospheric organic particulate matter in a Portuguese rural area. Atmospheric Environment, 35(8), 1365–1375. https://doi.org/10.1016/S1352-2310(00)00391-5.
Presto, A. A., Miracolo, M. A., Donahue, N. M., & Robinson, A. L. (2010). Secondary organic aerosol formation from high-NO x photo-oxidation of low volatility precursors: n -alkanes. Environmental Science & Technology, 44(6), 2029–2034. https://doi.org/10.1021/es903712r.
Rogge, W. F., Hildemann, L. M., Mazurek, M. A., Cass, G. R., & Simoneit, B. R. T. (1993a). Sources of fine organic aerosol. 2. Noncatalyst and catalyst-equipped automobiles and heavy-duty diesel trucks. Environmental Science and Technology, 27(4), 636–651.
Rogge, W. F., Hildemann, L. M., Mazurek, M. A., Cass, G. R., & Simoneit, B. R. T. (1993b). Sources of fine organic aerosol. 4. Particulate abrasion products from leaf surfaces of urban plants. Environmental Science & Technology.
Rogge, W. F., Hildemann, L. M., Mazurek, M. A., Cass, G. R., & Simoneit, B. R. T. (1993c). Sources of fine organic aerosol. 3. Road dust, tire debris, and organometallic brake lining dust: roads as sources and sinks. Environmental Science & Technology.
Rogge, W. F., Mazurek, M. A., Hildemann, L. M., Cass, G. R., & Simoneit, B. R. T. (1993). Quantification of urban organic aerosols at a molecular level: Identification, abundance and seasonal variation. Atmospheric Environment Part A. General Topics, 27(8), 1309–1330. https://doi.org/10.1016/0960-1686(93)90257-Y.
Sarti, E., Pasti, L., Scaroni, I., Casali, P., Cavazzini, A., & Rossi, M. (2017). Determination of n-alkanes, PAHs and nitro-PAHs in PM2.5 and PM1 sampled in the surroundings of a municipal waste incinerator. Atmospheric Environment, 149, 12–23. https://doi.org/10.1016/j.atmosenv.2016.11.016.
Saud, T., Saxena, M., Singh, D. P., Dahiya, M., Sharma, S. K., Datta, A., et al. (2013). Spatial variation of chemical constituents from the burning of commonly used biomass fuels in rural areas of the Indo-Gangetic plain (IGP), India. Atmospheric Environment, 71, 158–169. https://doi.org/10.1016/j.atmosenv.2013.01.053.
Schauer, J. J., Kleeman, M. J., Cass, G. R., & Simoneit, B. R. T. (1999). Measurement of emissions from air pollution sources. 2. C 1 through C 30 organic compounds from medium duty diesel trucks. Environmental Science & Technology, 33(10), 1578–1587. https://doi.org/10.1021/es980081n.
Schauer, J. J., Kleeman, M. J., Cass, G. R., & Simoneit, B. R. T. (2001). Measurement of emissions from air pollution sources. 3. C 1 −C 29 organic compounds from fireplace combustion of wood. Environmental Science & Technology, 35(9), 1716–1728. https://doi.org/10.1021/es001331e.
Schauer, J. J., Kleeman, M. J., Cass, G. R., & Simoneit, B. R. T. (2002). Measurement of emissions from air pollution sources. 5. C 1 −C 32 organic compounds from gasoline-powered motor vehicles. Environmental Science & Technology, 36(6), 1169–1180. https://doi.org/10.1021/es0108077.
Schauer, J. J., Rogge, W., Hildemann, L., Mazurek, M., Cass, G. R., & Simoneit, B. R. T. (2007). Source apportionment of airborne particulate matter using organic compounds as tracers. Atmospheric Environment, 41(SUPPL), 241–259. https://doi.org/10.1016/j.atmosenv.2007.10.069.
Sharma, D. (2003). Preliminary chemical characterization of particle-phase organic compounds in New Delhi, India. Atmospheric Environment, 37(30), 4317–4323. https://doi.org/10.1016/S1352-2310(03)00563-6.
Sharma, S. K., Mandal, T. K., Srivastava, M. K., Chatterjee, A., Jain, S., Saxena, M., Singh, B. P., Saraswati, Sharma, A., Adak, A., & K.Ghosh, S. (2016). Spatio-temporal variation in chemical characteristics of PM10 over Indo Gangetic Plain of India. Environmental Science and Pollution Research, 23(18), 18809–18822. https://doi.org/10.1007/s11356-016-7025-2.
Sheesley, R. J., Schauer, J. J., & Simoneit, B. R. T. (2003). Characterization of organic aerosols emitted from the combustion of biomass indigenous to South Asia, 108. https://doi.org/10.1029/2002JD002981.
Shivani, Gadi, R., Sharma, S. K., Mandal, T. K., Kumar, R., Mona, S., et al. (2018). Levels and sources of organic compounds in fine ambient aerosols over National Capital Region of India. Environmental Science and Pollution Research, 25(31), 31071–31090. https://doi.org/10.1007/s11356-018-3044-5.
Silverstein, R. M., Webster, F. X., Kiemle, D. J., & Bryce, D. L. (2014). Spectrometric identification of organic compounds (8th ed.). Hoboken: Wiley.
Simoneit, B. R. T. (1984). Organic matter of the troposphere—III. Characterization and sources of petroleum and pyrogenic residues in aerosols over the western United States. Atmospheric Environment (1967), 18(1), 51–67. https://doi.org/10.1016/0004-6981(84)90228-2.
Simoneit, B. R. T. (1986). Characterization of organic constituents in aerosols in relation to their rigin and transport: a review. International Journal of Environmental Analytical Chemistry, 23(3), 207–237. https://doi.org/10.1080/03067318608076446.
Simoneit, B. R. T. (1989). Organic matter of the troposphere ? V: application of molecular marker analysis to biogenic emissions into the troposphere for source reconciliations. Journal of Atmospheric Chemistry, 8(3), 251–275. https://doi.org/10.1007/BF00051497.
Simoneit, B. R. T. (1999). A review of biomarker compounds as source indicators and tracers for air pollution. Environmental Science and Pollution Research, 6, 159–169.
Simoneit, B. R. (2002a). Biomass burning — a review of organic tracers for smoke from incomplete combustion. Applied Geochemistry, 17(3), 129–162. https://doi.org/10.1016/S0883-2927(01)00061-0.
Simoneit, B. R. T. (2002b). Measurement of emissions from air organic compounds from gasoline-powered motor vehicles, 1169–1180.
Simoneit, B. R. T., Cardoso, J. N., & Robinson, N. (1991). An assessment of terrestrial higher molecular weight lipid compounds in aerosol particulate matter over the South Atlantic from about 30–70°S. Chemosphere, 23(4), 447–465. https://doi.org/10.1016/0045-6535(91)90196-K.
Singh, A., Rastogi, N., Patel, A., & Singh, D. (2016). Seasonality in size-segregated ionic composition of ambient particulate pollutants over the Indo-Gangetic Plain: Source apportionment using PMF. Environmental Pollution, 219, 906–915. https://doi.org/10.1016/j.envpol.2016.09.010.
Stone, E. A., Schauer, J. J., Pradhan, B. B., Dangol, P. M., Habib, G., Venkataraman, C., & Ramanathan, V. (2010), Characterization of emissions from South Asian biofuels and application to source apportionment of carbonaceous aerosol in the Himalayas 115, 1–14. https://doi.org/10.1029/2009JD011881
Tandon, A., Rothfuss, N. E., & Petters, M. D. (2019). The effect of hydrophobic glassy organic material on the cloud condensation nuclei activity of particles with different morphologies. Atmospheric Chemistry and Physics, 19(5), 3325–3339. https://doi.org/10.5194/acp-19-3325-2019.
Tang, R., Wu, Z., Li, X., Wang, Y., Shang, D., Xiao, Y., Li, M., Zeng, L., Wu, Z., Hallquist, M., Hu, M., & Guo, S. (2018). Primary and secondary organic aerosols in summer 2016 in Beijing. Atmospheric Chemistry and Physics, 18(6), 4055–4068. https://doi.org/10.5194/acp-18-4055-2018.
Turpin, B. J., Saxena, P., & Andrews, E. (2000). Measuring and simulating particulate organics in the atmosphere: problems and prospects. Atmospheric Environment, 34(18), 2983–3013. https://doi.org/10.1016/S1352-2310(99)00501-4.
Yadav, S., Bamotra, S., & Tandon, A. (2020). Aerosol-associated non-polar organic compounds (NPOCs) at Jammu, India, in the North-Western Himalayan Region: seasonal variations in sources and processes. Environmental Science and Pollution Research, 27, 18875–18892. https://doi.org/10.1007/s11356-020-08374-3.
Yadav, S., Tandon, A., & Attri, A. K. (2013a). Characterization of aerosol associated non-polar organic compounds using TD-GC-MS: a four year study from Delhi, India. Journal of Hazardous Materials, 252–253, 29–44. https://doi.org/10.1016/j.jhazmat.2013.02.024.
Yadav, S., Tandon, A., & Attri, A. K. (2013b). Monthly and seasonal variations in aerosol associated n-alkane profiles in relation to meteorological parameters in New Delhi, India. Aerosol and Air Quality Research, 13(1), 287–300. https://doi.org/10.4209/aaqr.2012.01.0004.
Yadav, S., Tandon, A., & Attri, A. K. (2014). Timeline trend profile and seasonal variations of nicotine present in ambient PM10 samples: a four year investigation from Delhi region, India. Atmospheric Environment, 98, 89–97. https://doi.org/10.1016/j.atmosenv.2014.08.058.
Yadav, S., Tandon, A., Tripathi, J. K., Yadav, S., & Attri, A. K. (2016). Statistical assessment of respirable and coarser size ambient aerosol sources and their timeline trend profile determination: a four year study from Delhi. Atmospheric Pollution Research, 7(1), 190–200. https://doi.org/10.1016/j.apr.2015.08.010.
Zhao, Y., Saleh, R., Saliba, G., Presto, A. A., Gordon, T. D., Drozd, G. T., Goldstein, A. H., Donahue, N. M., & Robinson, A. L. (2017). Reducing secondary organic aerosol formation from gasoline vehicle exhaust. Proceedings of the National Academy of Sciences, 114(27), 6984–6989. https://doi.org/10.1073/pnas.1620911114.
Acknowledgements
Sincere acknowledgements to the Managing Director, Kangra Cooperative Bank, Dharamshala, for providing logistic support for the PM10 sampling at Dharamshala. Authors thank National Oceanic and Atmospheric Administration, USA and Indian Meteorological Department, India, for providing meteorological datasets.
Funding
DK received Non-NET fellowship from University Grants Commission (UGC), India. Also, the SY received financial support by UGC, India, in the form of a major research project no. MRP-MAJOR-ENVI-2013-30069 vide file no. 43-332/2014.
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Kaushal, D., Bamotra, S., Yadav, S. et al. Aerosol-associated n-alkanes over Dhauladhar region of North-Western Himalaya: seasonal variations in sources and processes. Environ Monit Assess 192, 517 (2020). https://doi.org/10.1007/s10661-020-08483-z
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DOI: https://doi.org/10.1007/s10661-020-08483-z