DOI: 10.1002/2014GB004911
Scopus记录号: 2-s2.0-84924871456
论文题名: The age of river-transported carbon: A global perspective
作者: Marwick T ; R ; , Tamooh F ; , Teodoru C ; R ; , Borges A ; V ; , Darchambeau F ; , Bouillon S
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 2 起始页码: 122
结束页码: 137
语种: 英语
英文关键词: 14C
; Africa
; data set
; global carbon cycle
; organic carbon
; rivers
Scopus关键词: carbon cycle
; coastal zone
; dissolved organic carbon
; global perspective
; particulate organic carbon
; river flow
; Africa
英文摘要: The role played by river networks in regional and global carbon (C) budgets is receiving increasing attention. Despite the potential of radiocarbon measurements (Δ14C) to elucidate sources and cycling of different riverine C pools, there remain large regions for which no data are available and no comprehensive attempts to synthesize the available information and examine global patterns in the 14C content of different riverine C pools. Here we present new 14C data on particulate and dissolved organic C (POC and DOC) from six river basins in tropical and subtropical Africa and compiled >1400 literature Δ14C data and ancillary parameters from rivers globally. Our analysis reveals a consistent pattern whereby POC is progressively older in systems carrying higher sediment loads, coinciding with a lower organic carbon content. At the global scale, this pattern leads to a proposed global median Δ14C signature of -203‰, corresponding to an age of ∼1800 years B.P. For DOC exported to the coastal zone, we predict a modern (decadal) age (Δ14C=+22 to +46‰), and paired data sets confirm that riverine DOC is generally more recent in origin than POC - in contrast to the situation in ocean environments. Weathering regimes complicate the interpretation of 14C ages of dissolved inorganic carbon, but the available data favor the hypothesis that in most cases, more recent organic C is preferentially mineralized. ©2015. 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/78022
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth and Environmental Sciences, Katholieke Universiteit Leuven, Leuven, Belgium; Chemical Oceanography Unit, University of Liège, Institut de Physique (B5), Liège, Belgium
Recommended Citation:
Marwick T,R,, Tamooh F,et al. The age of river-transported carbon: A global perspective[J]. Global Biogeochemical Cycles,2015-01-01,29(2)