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DOI10.1016/j.atmosres.2020.105376
Water-soluble organic and inorganic nitrogen in ambient aerosols over the Himalayan middle hills: Seasonality, sources, and transport pathways
Tripathee L.; Kang S.; Chen P.; Bhattarai H.; Guo J.; Shrestha K.L.; Sharma C.M.; Sharma Ghimire P.; Huang J.
Date Issued2021
ISSN0169-8095
Volume250
Other AbstractAtmospheric nitrogen is ubiquitous in the environment and hence plays an essential role in the nutrient balance over the whole ecosystem. However, its abundance and characteristics, particularly in the Himalayas, are not well understood. Therefore, to understand the abundance, sources, and seasonality of soluble nitrogenous species in the middle hills of the central Himalayas, aerosol samples were collected at Dhulikhel in Nepal from January to December 2018. The results of this study revealed that water-soluble inorganic nitrogen (WSIN) contributed the most to water-soluble total nitrogen with an abundance of ammonium nitrogen (NH4+–N). Moreover, water-soluble organic nitrogen (WSON) contributed approximately 18% to aerosol total water-soluble nitrogen. The aerosol mass and WSIN species exhibited strong seasonality with considerably higher concentrations during dry periods and lower concentrations during the wet period. Furthermore, for dry periods, the HYSPLIT model revealed that nitrogen aerosols mainly originated from the Indo-Gangetic Plain region and were transported and deposited in the Himalayas through long-range atmospheric transport. The strong correlations of WSON with nss–K+ (biomass burning) and nss–Ca2+ (crustal sources) and lack of a significant correlation with SO42− indicated that primary sources are responsible for generating WSON rather than secondary processes in the Himalayas. The estimated dry deposition fluxes for NO3−–N, NH4+–N, and WSON were 1.56, 8.35, and 4.06 kg ha−1 y−1, respectively. This study also shows that increasing air contaminants and emissions over South Asia can enter the Himalayas and affect the human health and ecology of this fragile area. © 2020 Elsevier B.V.
enkeywordsAerosol; Dry deposition; Himalayas; Water-soluble organic nitrogen; Water-soluble total nitrogen
journalAtmospheric Research
Source Publication中国科学院西北生态环境资源研究院
Document Type期刊论文
Identifierhttp://gcip.llas.ac.cn/handle/2XKMVOVA/236891
AffiliationState Key Laboratory of Cryospheric Science, Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences (CAS), Lanzhou, 730000, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, 100085, China; Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese, Academy of Sciences, Beijing, 100101, China; Himalayan Environment Research Institute (HERI), Kathmandu, Nepal; University of Chinese Academy of Sciences, Beijing, 100049, China; Department of Environmental Science and Engineering, Kathmandu University, Dhulikhel, Nepal; Central Department of Environmental Science, Tribhuvan University, Kathmandu, Nepal; Earth System Science Programme and Graduate Division of Earth and Atmospheric Sciences, The Chinese University of Hong Kong, Hong Kong
Recommended Citation
GB/T 7714
Tripathee L.,Kang S.,Chen P.,et al. Water-soluble organic and inorganic nitrogen in ambient aerosols over the Himalayan middle hills: Seasonality, sources, and transport pathways[J]. 中国科学院西北生态环境资源研究院,2021,250.
APA Tripathee L..,Kang S..,Chen P..,Bhattarai H..,Guo J..,...&Huang J..(2021).Water-soluble organic and inorganic nitrogen in ambient aerosols over the Himalayan middle hills: Seasonality, sources, and transport pathways.Atmospheric Research,250.
MLA Tripathee L.,et al."Water-soluble organic and inorganic nitrogen in ambient aerosols over the Himalayan middle hills: Seasonality, sources, and transport pathways".Atmospheric Research 250(2021).
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