Organic and inorganic components of aerosols over the central Himalayas: winter and summer variations in stable carbon and nitrogen isotopic composition
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- 作者：Prashant Hegde ; Kimitaka Kawamura ; H. Joshi…
- 关键词：Himalayan aerosols ; Biomass burning ; Fossil fuel combustion ; Long ; range transport ; Pollution assessment
- 刊名：Environmental Science and Pollution Research
- 出版年：2016
- 出版时间：April 2016
- 年：2016
- 卷：23
- 期：7
- 页码：6102-6118
- 全文大小：1,267 KB
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Kimitaka Kawamura (2)
H. Joshi (3)
M. Naja (3)
1. Space Physics Laboratory, Vikram Sarabhai Space Centre, Trivandrum, India
2. Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan
3. Aryabhatta Research Institute of Observational Sciences, Nainital, India - 刊物类别：Earth and Environmental Science
- 刊物主题：Environment
Environment
Atmospheric Protection, Air Quality Control and Air Pollution
Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
Industrial Pollution Prevention - 出版者：Springer Berlin / Heidelberg
- ISSN：1614-7499
文摘
The aerosol samples were collected from a high elevation mountain site, Nainital, in India (1958 m asl) during September 2006 to June 2007 and were analyzed for water-soluble inorganic species, total carbon, nitrogen, and their isotopic composition (δ13C and δ15N, respectively). The chemical and isotopic composition of aerosols revealed significant anthropogenic influence over this remote free-troposphere site. The amount of total carbon and nitrogen and their isotopic composition suggest a considerable contribution of biomass burning to the aerosols during winter. On the other hand, fossil fuel combustion sources are found to be dominant during summer. The carbon aerosol in winter is characterized by greater isotope ratios (av. −24.0 ‰), mostly originated from biomass burning of C4 plants. On the contrary, the aerosols in summer showed smaller δ13C values (−26.0 ‰), indicating that they are originated from vascular plants (mostly of C3 plants). The secondary ions (i.e., SO4 2−, NH4 +, and NO3 −) were abundant due to the atmospheric reactions during long-range transport in both seasons. The water-soluble organic and inorganic compositions revealed that they are aged in winter but comparatively fresh in summer. This study validates that the pollutants generated from far distant sources could reach high altitudes over the Himalayan region under favorable meteorological conditions.