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Radon-traced pore-water as a potential source of CO2 and CH4 to receding black and clear water environments in the Amazon Basin
National Marine Science Centre, School of Environment, Science and Engineering, Southern Cross University, Coffs Harbour, New South Wales, Australia; Southern Cross Geoscience, Southern Cross University, Lismore, New South Wales, Australia.
National Marine Science Centre, School of Environment, Science and Engineering, Southern Cross University, Coffs Harbour, New South Wales, Australia;.
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences. Department of Botany, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil; Ecosystems and Global Change Laboratory (LEMGUFF)/ International Laboratory of Global Change (LINCGlobal), Biomass and Water Management Research Center (NABUFF), Graduate Program in Geosciences (Environmental Geochemistry), Universidade Federal Fluminense (UFF), Niteroi, Rio de Janeiro, Brazil.
Southern Cross Geoscience, Southern Cross University, Lismore, New South Wales, Australia.
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2018 (English)In: Limnology and Oceanography Letters, ISSN 2378-2242Article in journal (Refereed) Epub ahead of print
Abstract [en]

Abstract Groundwater is a primary source of dissolved CO2 and CH4 in Amazonian headwaters, yet in higher order rivers, a groundwater/pore-water source is difficult to constrain due to the high spatial and temporal heterogeneity of pore-water exchange. Here, we report coupled, high resolution measurements of pCO2, CH4, and 222Rn (a natural pore-water and groundwater tracer) during receding waters in the three major water types of the Central Amazon Basin: black (Negro River); clear (Tapajós River); white (Madeira River). Considerable spatial heterogeneity was observed in pCO2, CH4, and 222Rn concentrations ranging from 460 ?atm to 8030 ?atm, 7 nM to 281 nM, and 713 dpm m?3 to 8516 dpm m?3, respectively. The significant correlations between pCO2 and CH4 to 222Rn in the black and clear waters suggests that pore-water further enhanced CO2 supersaturation by 18?47% and is a driver of CH4 dynamics in these waters.

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Wiley-Blackwell , 2018.
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Earth and Related Environmental Sciences
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URN: urn:nbn:se:liu:diva-150985DOI: 10.1002/lol2.10089OAI: oai:DiVA.org:liu-150985DiVA, id: diva2:1246512
Available from: 2018-09-07 Created: 2018-09-07 Last updated: 2018-09-07

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Enrich Prast, Alex

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