Abstract
The transport and deposition of atmospheric pollutants in the Himalayas have a adverse impact on the climate, cryosphere, ecosystem, and monsoon patterns. Unfortunately, there is a insufficiency of data on trace element concentrations and behaviors in the high-altitude Himalayan region, leading to limited research in this area. This study presents a comprehensive and detailed comprehension of trace element deposition, its spatial distribution, seasonal variations, and anthropogenic signals in the high-altitude Kashmir region of the Western Himalayas. Our investigation involved the analysis of 10 trace elements (Al, Cr, Mn, Fe, Co, Ni, Cu, Zn, Cd, and Pb) in glacier ice, snow pits, surface snow, and rainwater collected at various sites including Kolahoi, Thajwas, Pahalgam (Greater Himalayan ranges), and Kongdori and Shopian (Pir Panjal Ranges) during 2021. The study reveals distinct ranges of concentrations for the trace elements at different sampling sites. Our analysis of trace element concentration depth profiles in snow pits reveals seasonal fluctuations during the deposition year. The highest concentrations were found in the autumn (below 20 cm) and summer (top layer), compared to the winter concentration (10–20 cm). The high enrichment factors (EFs) suggest the severity of human-induced trace metal deposition in the western Himalayan region, relative to surrounding regions. Surprisingly, the concentrations and EFs of trace elements showed seasonal contradictions, with lower concentration values and higher EFs during the non-monsoon season and vice versa. A source apportionment analysis using the positive matrix factorization (PMF) technique identified five sources of trace element deposition in the region, including crustal sources (32.33%), coal combustion (15.62%), biomass burning (17.63%), traffic emission (18.8%), and industrial sources (15.6%). Additionally, the study incorporated backward trajectories coupled with δ18O using the NOAA HYSPLIT model to estimate moisture sources in the region, which suggests atmospheric pollutants predominately deposited from the large-scale atmospheric circulation from westerlies (75%) during non-monsoon season. These findings underscore the urgent need for enhanced monitoring and research efforts in the future.
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24 May 2024
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Acknowledgements
The first author (TD) acknowledges the support by the MHRD fellowship granted by Indian Institute of Technology, Roorkee, Indian. The authors gratefully acknowledge the NOAA Air Resources Laboratory (ARL) for provision of the HYSPLIT transport and dispersion model and/or READY website (http://www.ready.noaa.gov).
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Tanveer Dar: conceptualization, methodology, investigation, data curation, formal analysis, visualization, writing—original draft, and writing—review and editing. Nachiketa Rai: conceptualization, investigation, and writing—review and editing. Akthar Jahan: methodology, and writing—review and editing. Sudhir Kumar: isotopic analysis, and writing—review and editing. Mohd Aadil Bhat: writing—review and editing. Rayees Ahmed: writing—review and editing.
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Dar, T., Rai, N., Jahan, A. et al. Uncovering sources, distribution, and seasonal patterns of trace element deposition: the elemental puzzle of the western Himalayas. Environ Sci Pollut Res (2024). https://doi.org/10.1007/s11356-024-33601-6
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DOI: https://doi.org/10.1007/s11356-024-33601-6