DOI: 10.1111/gcb.13603
论文题名: The global pyrogenic carbon cycle and its impact on the level of atmospheric CO2 over past and future centuries
作者: Landry J.-S. ; Matthews H.D.
刊名: Global Change Biology
出版年: 2017
卷: 23, 期: 8 起始页码: 3205
结束页码: 3218
语种: 英语
英文关键词: atmospheric CO2
; black carbon
; carbon cycle
; carbon decomposition
; carbon sink
; char
; climate change
; landscape fires
; pyrogenic organic matter
; uncertainties
Scopus关键词: black carbon
; carbon cycle
; carbon dioxide
; climate change
; concentration (composition)
; organic matter
英文摘要: The incomplete combustion of vegetation and dead organic matter by landscape fires creates recalcitrant pyrogenic carbon (PyC), which could be consequential for the global carbon budget if changes in fire regime, climate, and atmospheric CO2 were to substantially affect gains and losses of PyC on land and in oceans. Here, we included global PyC cycling in a coupled climate–carbon model to assess the role of PyC in historical and future simulations, accounting for uncertainties through five sets of parameter estimates. We obtained year-2000 global stocks of (Central estimate, likely uncertainty range in parentheses) 86 (11–154), 47 (2–64), and 1129 (90–5892) Pg C for terrestrial residual PyC (RPyC), marine dissolved PyC, and marine particulate PyC, respectively. PyC cycling decreased atmospheric CO2 only slightly between 1751 and 2000 (by 0.8 Pg C for the Central estimate) as PyC-related fluxes changed little over the period. For 2000 to 2300, we combined Representative Concentration Pathways (RCPs) 4.5 and 8.5 with stable or continuously increasing future fire frequencies. For the increasing future fire regime, the production of new RPyC generally outpaced the warming-induced accelerated loss of existing RPyC, so that PyC cycling decreased atmospheric CO2 between 2000 and 2300 for most estimates (by 4–8 Pg C for Central). For the stable fire regime, however, PyC cycling usually increased atmospheric CO2 (by 1–9 Pg C for Central), and only the most extreme choice of parameters maximizing PyC production and minimizing PyC decomposition led to atmospheric CO2 decreases under RCPs 4.5 and 8.5 (by 5–8 Pg C). Our results suggest that PyC cycling will likely reduce the future increase in atmospheric CO2 if landscape fires become much more frequent; however, in the absence of a substantial increase in fire frequency, PyC cycling might contribute to, rather than mitigate, the future increase in atmospheric CO2. © 2016 John Wiley & Sons Ltd 资助项目: Landry, J.-S.
; Centre d'applications et de recherches en télédétection, Département de géomatique appliquée, Université de Sherbrooke, J1K 2R1, Canada
; 电子邮件: jean-sebastien.landry@usherbrooke.ca
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60853
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Geography, Planning and Environment, Concordia University, H3G 1M8, Montréal, QC, Canada; Centre d'applications et de recherches en télédétection, Département de géomatique appliquée, Université de Sherbrooke, J1K 2R1, Sherbrooke, QC, Canada
Recommended Citation:
Landry J.-S.,Matthews H.D.. The global pyrogenic carbon cycle and its impact on the level of atmospheric CO2 over past and future centuries[J]. Global Change Biology,2017-01-01,23(8)