DOI: 10.1038/ngeo2341
论文题名: Carbonate weathering as a driver of CO2 supersaturation in lakes
作者: Marcé R. ; Obrador B. ; Morguí J.-A. ; Lluís Riera J. ; López P. ; Armengol J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期: 2 起始页码: 107
结束页码: 111
语种: 英语
Scopus关键词: carbon balance
; carbon dioxide
; carbon emission
; carbonate sediment
; concentration (composition)
; lake ecosystem
; supersaturation
; water chemistry
; Spain
英文摘要: Most lakes and reservoirs have surface CO2 concentrations that are supersaturated relative to the atmosphere. The resulting CO2 emissions from lakes represent a substantial contribution to the continental carbon balance. Thus, the drivers of CO2 supersaturation in lakes need to be understood to constrain the sensitivity of the land carbon cycle to external perturbations. Carbon dioxide supersaturation has generally been attributed to the accumulation of inorganic carbon in lakes where respiration exceeds photosynthesis, but this interpretation has faced challenges. Here we report analyses of water chemistry data from a survey of Spanish reservoirs that represent a range of lithologies, using simple metabolic models. We find that, above an alkalinity threshold of 1 mequiv. l-1, CO2 supersaturation in lakes is directly related to carbonate weathering in the watershed. We then evaluate the global distribution of alkalinity in lakes and find that 57% of the surface area occupied by lakes and reservoirs - particularly in tropical and temperate latitudes - has alkalinity exceeding 1 mequiv. l-1. We conclude that lake inputs of dissolved inorganic carbon from carbonate weathering should be considered for the CO2 supersaturation of lakes at both regional and global scales. © 2015 Macmillan Publishers Limited. All rights reserved Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106337
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Catalan Institute for Water Research (ICRA), Emili Grahit 101, Girona, Spain; Department of Ecology, University of Barcelona, Diagonal 643, Barcelona, Spain; Catalan Institute of Climate Sciences (IC3), Doctor Trueta 203, Barcelona, Spain
Recommended Citation:
Marcé R.,Obrador B.,Morguí J.-A.,et al. Carbonate weathering as a driver of CO2 supersaturation in lakes[J]. Nature Geoscience,2015-01-01,8(2)