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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
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- Call, Mitchell (author)
- 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
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- Sanders, Christian J. (author)
- National Marine Science Centre, School of Environment, Science and Engineering, Southern Cross University, Coffs Harbour, New South Wales, Australia;
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- Enrich Prast, Alex, 1972- (author)
- Linköpings universitet,Tema Miljöförändring,Filosofiska fakulteten,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
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- 2018-08-07
- 2018
- English.
- In: Limnology and Oceanography Letters. - : Wiley-Blackwell. - 2378-2242. ; 3:5, s. 375-383
- Journal article (peer-reviewed)
Abstract
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- 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.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
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