Abstract
Carbonaceous aerosol (CAs) pollution is a significant cause of the deterioration of the susceptible Himalayan region, which profoundly affects climate change. In this study, we examined the winter-time pollution load of carbonaceous species [Organic Carbon (OC), Elemental Carbon (EC), Water-Soluble Organic Carbon (WSOC), Water-Soluble Ionic Species (WSIS), Primary Organic Carbon (POC), Secondary Organic Carbon (SOC), and Total Carbonaceous Aerosols (TCAs)] of PM10 over a semi-urban high-altitude site of Darjeeling (27.041° N, 88.266° E, 2200 m above mean sea level (AMSL); an eastern Himalayan region), India, from January to February 2019. During winter, the PM10 concentration (µg m−3) was found to be 52 ± 18, which comprises 24% of CAs, 30% of WSIS, and 8% of sea salts. The secondary aerosols contribute about 79% to WSIS and 24% to PM10. The average concentration of WSIS was observed in the order of SO42− > NH4+ > NO3− > Na+ > K+ = Ca+2 > Cl− > Mg+2 > F−, respectively. Lower ECR (Effective Carbon Ratio) suggests a reduction in the number of scatterings CAs and possibly an increase in the absorbing CAs. The mean OC/EC ratio (2.04 ± 0.37), K+/OC (0.11 ± 0.04), and their good correlations of 0.77 and 0.74, respectively, suggested fuel combustion (biomass burning and fossil fuels) as the major contributing source in Eastern Himalayas. In addition, a high WSOC/OC ratio (0.74 ± 0.22) implied the formation of secondary aerosols and the presence of aged aerosols. The trajectory analysis showed that the air masses mainly originated from the IGP region, Nepal, and the local region of the sampling site.
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Acknowledgements
The authors are thankful to the Director, CSIR-NPL, New Delhi, for providing their valuable support in carrying out this research work. One of the authors (Akansha Rai) is thankful to the University Grants Commission (UGC) for providing the fellowship. The authors also thank Mrs. Yashodhara Yadav, Bose Institute, Darjeeling, for PM10 sampling and for providing relevant data sets. The authors also acknowledge the Department of Science and Technology, New Delhi, for providing financial support for this study (DST/CCP/Aerosol/88/2017). Finally, the authors thankfully acknowledge the NOAA Air Resources Laboratory for downloading the air mass trajectories.
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Rai, A., Chatterjee, A., Mandal, T.K., Sharma, S.K. (2024). Characterization of Atmospheric Carbonaceous Species in PM10 over Darjeeling, an Eastern Himalayan Region of India. In: Yadav, S., Garg, N., Aggarwal, S.G., Jaiswal, S.K., Kumar, H., Achanta, V.G. (eds) Recent Advances in Metrology. AdMet 2022. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-99-4594-8_1
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