DOI: 10.1002/2015GL066921
论文题名: Measurements and modeling of contemporary radiocarbon in the stratosphere
作者: Kanu A.M. ; Comfort L.L. ; Guilderson T.P. ; Cameron-Smith P.J. ; Bergmann D.J. ; Atlas E.L. ; Schauffler S. ; Boering K.A.
刊名: Geophysical Research Letters
ISSN: 0094-9383
EISSN: 1944-9114
出版年: 2016
卷: 43, 期: 3 起始页码: 1399
结束页码: 1406
语种: 英语
英文关键词: carbon cycle
; carbon dioxide
; cosmogenic radionuclides
; radiocarbon
; stratosphere
; stratosphere-troposphere exchange
Scopus关键词: Fossil fuels
; Fuels
; Nuclear weapons
; Residence time distribution
; Troposphere
; Upper atmosphere
; Carbon cycles
; Chemical transport models
; Cosmogenic radionuclides
; Fossil fuel combustion
; High-altitude balloons
; Measurements and modeling
; radiocarbon
; Stratosphere-troposphere exchange
; Carbon dioxide
; biogeochemical cycle
; carbon cycle
; carbon dioxide
; cosmogenic radionuclide
; fossil fuel
; fuel consumption
; global perspective
; measurement method
; nuclear weapon
; numerical model
; residence time
; stratosphere
; stratosphere-troposphere interaction
英文摘要: Measurements of the 14C content of carbon dioxide in air collected by high-altitude balloon flights in 2003-2005 reveal the contemporary radiocarbon distribution in the northern midlatitude stratosphere, four decades after the Limited Test Ban Treaty restricted atmospheric testing of nuclear weapons. Comparisons with results from a 3-D chemical-transport model show that the 14CO2 distribution is now largely governed by the altitude/latitude dependence of the natural cosmogenic production rate, stratospheric transport, and propagation into the stratosphere of the decreasing radiocarbon trend in tropospheric CO2 due to fossil fuel combustion. From the observed correlation of 14CO2 with N2O mixing ratios, an annual global mean net flux of 14CO2 to the troposphere of 1.6(±0.4) × 1017‰ mol CO2 yr-1 and a global production rate of 2.2(±0.6) × 1026 atoms 14C yr-1 are empirically derived. The results also indicate that contemporary 14CO2 observations provide highly sensitive diagnostics for stratospheric transport and residence times in models. © 2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84959378087&doi=10.1002%2f2015GL066921&partnerID=40&md5=c602aebcdd250b1f0841dbd8120e3221
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10346
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: Department of Chemistry, University of California, Berkeley, CA, United States
Recommended Citation:
Kanu A.M.,Comfort L.L.,Guilderson T.P.,et al. Measurements and modeling of contemporary radiocarbon in the stratosphere[J]. Geophysical Research Letters,2016-01-01,43(3).