DOI: 10.1002/2015GL066193
论文题名: An atmospheric photochemical source of the persistent greenhouse gas CF4
作者: Jubb A.M. ; McGillen M.R. ; Portmann R.W. ; Daniel J.S. ; Burkholder J.B.
刊名: Geophysical Research Letters
ISSN: 0094-8455
EISSN: 1944-8186
出版年: 2015
卷: 42, 期: 21 起始页码: 9505
结束页码: 9511
语种: 英语
英文关键词: Kyoto protocol
; perfluorocarbons
; tetrafluoromethane
; UV photolysis
Scopus关键词: Budget control
; Degradation
; Greenhouse gases
; Photolysis
; Polyols
; Atmospheric model
; Degradation products
; KYOTO protocol
; Perfluorocarbons
; Photochemical production
; Photochemical sources
; Tetrafluoromethane
; UV photolysis
; Photodegradation
; atmospheric modeling
; climate effect
; fluorocarbon
; greenhouse gas
; Kyoto Protocol
; persistent organic pollutant
; photochemistry
; photolysis
; pollutant source
; pollution monitoring
; stratosphere
; two-dimensional modeling
; ultraviolet radiation
; wavelength
英文摘要: A previously uncharacterized atmospheric source of the persistent greenhouse gas tetrafluoromethane, CF4, has been identified in the UV photolysis of trifluoroacetyl fluoride, CF3C(O)F, which is a degradation product of several halocarbons currently present in the atmosphere. CF4 quantum yields in the photolysis of CF3C(O)F were measured at 193, 214, 228, and 248 nm, wavelengths relevant to stratospheric photolysis, to be (75.3 ± 1) × 10-4, (23.7 ± 0.4) × 10-4, (6.6 ± 0.2) × 10-4, and ≤0.4 × 10-4, respectively. A 2-D atmospheric model was used to estimate the contribution of the photochemical source to the global CF4 budget. The atmospheric photochemical production of CF4 from CF3CH2F (HFC-134a), CF3CHFCl (HCFC-124), and CF3CCl2F (CFC-114a) per molecule emitted was calculated to be (1-2.5) × 10-5, 1.0 × 10-4, and 2.8 × 10-3, respectively. Although CF4 photochemical production was found to be relatively minor at the present time, the identified mechanism demonstrates that long-lived products with potential climate impacts can be formed from the atmospheric breakdown of shorter-lived source gases. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84955214064&doi=10.1002%2f2015GL066193&partnerID=40&md5=4d2d7fa8ba53e500f06d35f88ec6ba1c
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8071
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Earth System Research Laboratory, Chemical Sciences Division, National Oceanic and Atmospheric Administration, Boulder, CO, United States
Recommended Citation:
Jubb A.M.,McGillen M.R.,Portmann R.W.,et al. An atmospheric photochemical source of the persistent greenhouse gas CF4[J]. Geophysical Research Letters,2015-01-01,42(21).