DOI: 10.1002/2016JD024880
论文题名: Dual carbon isotope characterization of total organic carbon in wintertime carbonaceous aerosols from northern India
作者: Bikkina S. ; Andersson A. ; Sarin M.M. ; Sheesley R.J. ; Kirillova E. ; Rengarajan R. ; Sudheer A.K. ; Ram K. ; Gustafsson O.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2016
卷: 121, 期: 9 起始页码: 4797
结束页码: 4809
语种: 英语
英文关键词: carbonaceous aerosols
; Indo-Gangetic Plain
; radiocarbon
; South Asia
; stable carbon isotopes
; total aerosol organic carbon
Scopus关键词: aerosol
; air quality
; biogenic emission
; biomass burning
; boundary layer
; carbon isotope
; radiocarbon dating
; regional climate
; stable isotope
; total organic carbon
; tracer
; trajectory
; winter
; Gangetic Plain
; Haryana
; Himalayas
; Hisar
; India
; Indian Ocean
; Manora Peak
; Siwalik Hills
; Uttarakhand
英文摘要: Large-scale emissions of carbonaceous aerosols (CA) from South Asia impact both regional climate and air quality, yet their sources are not well constrained. Here we use source-diagnostic stable and radiocarbon isotopes (δ13C and Δ14C) to characterize CA sources at a semiurban site (Hisar: 29.2°N, 75.2°E) in the NW Indo-Gangetic Plain (IGP) and a remote high-altitude location in the Himalayan foothills (Manora Peak: 29.4°N, 79.5°E, 1950 m above sea level) in northern India during winter. The Δ14C of total aerosol organic carbon (TOC) varied from -178‰ to -63‰ at Hisar and from -198‰ to -1‰ at Manora Peak. The absence of significant differences in the 14C-based fraction biomass of TOC between Hisar (0.81 ± 0.03) and Manora Peak (0.82 ± 0.07) reveals that biomass burning/biogenic emissions (BBEs) are the dominant sources of CA at both sites. Combining this information with δ13C, other chemical tracers (K+/OC and SO42-/EC) and air mass back trajectory analyses indicate similar source regions in the IGP (e.g., Punjab and Haryana). These results highlight that CA from BBEs in the IGP are not only confined to the atmospheric boundary layer but also extend to higher elevations of the troposphere, where the synoptic-scale circulations could substantially influence their abundances both to the Himalayas and over the downwind oceanic regions such as the Indian Ocean. Given the vast emissions of CA from postharvest crop residue combustion practices in the IGP during early Northeast Monsoon, this information is important for both improved process and model understanding of climate and health effects, as well as in guiding policy decision aiming at reducing emissions. © 2016. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62888
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Environmental Science and Analytical Chemistry, Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Planetary and Geosciences Division, Physical Research Laboratory, Ahmedabad, India; Institute of Environment and Sustainable Development Banaras Hindu University, Varanasi, India
Recommended Citation:
Bikkina S.,Andersson A.,Sarin M.M.,et al. Dual carbon isotope characterization of total organic carbon in wintertime carbonaceous aerosols from northern India[J]. Journal of Geophysical Research: Atmospheres,2016-01-01,121(9)