DOI: 10.1002/2014GB004941
Scopus记录号: 2-s2.0-84935875736
论文题名: Spatial patterns in CO2 evasion from the global river network
作者: Lauerwald R ; , Laruelle G ; G ; , Hartmann J ; , Ciais P ; , Regnier P ; A ; G
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 5 起始页码: 534
结束页码: 554
语种: 英语
英文关键词: carbon
; CO2
; global C cycle
; map
; pCO2
; river
Scopus关键词: air temperature
; carbon cycle
; carbon dioxide
; GIS
; global change
; spatial analysis
; Africa
; Asia
英文摘要: CO2 evasion from rivers (FCO2) is an important component of the global carbon budget. Here we present the first global maps of CO2 partial pressures (pCO2) in rivers of stream orders 3 and higher and the resulting FCO2 at 0.5° resolution constructed with a statistical model. A geographic information system based approach is used to derive a pCO2 prediction function trained on data from 1182 sampling locations. While data from Asia and Africa are scarce and the training data set is dominated by sampling locations from the Americas, Europe, and Australia, the sampling locations cover the full spectrum from high to low latitudes. The predictors of pCO2 are net primary production, population density, and slope gradient within the river catchment as well as mean air temperature at the sampling location (r2 = 0.47). The predicted pCO2 map was then combined with spatially explicit estimates of stream surface area Ariver and gas exchange velocity k calculated from published empirical equations and data sets to derive the FCO2 map. Using Monte Carlo simulations, we assessed the uncertainties of our estimates. At the global scale, we estimate an average river pCO2 of 2400 (2019-2826) μatm and a FCO2 of 650 (483-846) Tg C yr-1 (5th and 95th percentiles of confidence interval). Our global CO2 evasion is substantially lower than the recent estimate of 1800 Tg C yr-1 although the training set of pCO2 is very similar in both studies, mainly due to lower tropical pCO2 estimates in the present study. Our maps reveal strong latitudinal gradients in pCO2, Ariver, and FCO2. The zone between 10°N and 10°S contributes about half of the global CO2 evasion. Collection of pCO2 data in this zone, in particular, for African and Southeast Asian rivers is a high priority to reduce uncertainty on FCO2. ©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/77973
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, Université Libre de Bruxelles, Brussels, Belgium; Institut Pierre-Simon Laplace, Paris, France; Institute for Geology, University of Hamburg, Hamburg, Germany; Department of Earth Sciences-Geochemistry, Utrecht University, Utrecht, Netherlands; LSCE IPSL, Gif Sur Yvette, France
Recommended Citation:
Lauerwald R,, Laruelle G,G,et al. Spatial patterns in CO2 evasion from the global river network[J]. Global Biogeochemical Cycles,2015-01-01,29(5)