Journal ArticleDOI
Greenhouse Gas Emissions from Hydroelectric Reservoirs in Tropical Regions
Luiz Pinguelli Rosa,Marco Aurélio dos Santos,Bohdan Matvienko,Ednaldo Oliveira dos Santos,Elizabeth Sikar +4 more
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The main source of gas in power-dams reservoirs is the bacterial decomposition (aerobic and anaerobic) of autochthonous organic matter that basically produces CO2 and CH4 as mentioned in this paper.Abstract:
This paper discusses emissions by power-dams in the tropics. Greenhouse gas emissions from tropical power-dams are produced underwater through biomass decomposition by bacteria. The gases produced in these dams are mainly nitrogen, carbon dioxide and methane. A methodology was established for measuring greenhouse gases emitted by various power-dams in Brazil. Experimental measurements of gas emissions by dams were made to determine accurately their emissions of methane (CH4) and carbon dioxide (CO2) gases through bubbles formed on the lake bottom by decomposing organic matter, as well as rising up the lake gradient by molecular diffusion.The main source of gas in power-dams reservoirs is the bacterial decomposition (aerobic and anaerobic) of autochthonous and allochthonous organic matter that basically produces CO2 and CH4. The types and modes of gas production and release in the tropics are reviewed.read more
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Fragmentation and flow regulation of the world's large river systems
Christer Nilsson,Christer Nilsson,Catherine A. Reidy,Catherine A. Reidy,Mats Dynesius,Mats Dynesius,Carmen Revenga,Carmen Revenga +7 more
TL;DR: A global overview of dam-based impacts on large river systems shows that over half (172 out of 292) are affected by dams, including the eight most biogeographically diverse catchments, which can be used to identify ecological risks associated with further impacts onLarge river systems.
Journal ArticleDOI
Lakes and reservoirs as regulators of carbon cycling and climate
Lars J. Tranvik,John A. Downing,James B. Cotner,Steven Loiselle,Robert G. Striegl,Thomas J. Ballatore,Peter J. Dillon,Kerri Finlay,Kenneth Fortino,Lesley B. Knoll,Pirkko Kortelainen,Tiitt Kutser,Soren H. H. Larsen,Isabelle Laurion,Dina M. Leech,S. Leigh McCallister,Diane M. McKnight,John M. Melack,Erin P. Overholt,Jason A. Porter,Yves T. Prairie,William H. Renwick,Fábio Roland,Bradford Sherman,David W. Schindler,Sebastian Sobek,Alain Tremblay,Michael J. Vanni,Antoine M. Verschoor,Eddie von Wachenfeldt,Gesa A. Weyhenmeyer +30 more
TL;DR: The role of lakes in carbon cycling and global climate, examine the mechanisms influencing carbon pools and transformations in lakes, and discuss how the metabolism of carbon in the inland waters is likely to change in response to climate.
Journal ArticleDOI
Integrated life-cycle assessment of electricity-supply scenarios confirms global environmental benefit of low-carbon technologies.
Edgar G. Hertwich,Thomas Gibon,Evert A. Bouman,Anders Arvesen,Sangwon Suh,Garvin Heath,Joseph D. Bergesen,Andrea Ramirez,Mabel Vega,Lei Shi +9 more
TL;DR: This paper presents the first global, integrated life-cycle assessment of the large-scale implementation of climate-mitigation technologies, addressing the feedback of the electricity system onto itself and using scenario-consistent assumptions of technical improvements in key energy and material production technologies.
Journal ArticleDOI
Terrestrial carbon inputs to inland waters: A current synthesis of estimates and uncertainty
TL;DR: A review of flux estimates over the last decade has revealed an average increase of ∼ 0.3 Pg C yr−1, indicating a historical underestimation of the amount of terrestrial-C exported to inland waters.
Journal ArticleDOI
Methane bubbling from northern lakes: present and future contributions to the global methane budget
TL;DR: This work estimates point-source ebullition for 16 lakes in Alaska and Siberia that represent several common northern lake types: glacial, alluvial floodplain, peatland and thermokarst (thaw) lakes and estimates that northern lakes are a globally significant source of atmospheric CH4.
References
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Book
Climate change 1992 : the supplementary report to the IPCC scientific assessment
TL;DR: In this paper, the authors present an update of the emissions scenarios for the United Nations Environment Programme (UNEP), which is based on the results of the 1992 International Journal of Distributed Sensor Networks (JDSN).
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Journal ArticleDOI
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