Distribution and isotopic signature of deep gases in submerged soils in an island of the Lower Delta of the Paraná River, Argentina

Subsoil CH4 and CO2 concentrations, δ13C-CH4 and δ13C-CO2 signatures, total organic carbon (TOC) and δ13C-TOC, together with C/N ratio of organic matter, were evaluated throughout a soil profile up to the atmosphere to understand the dynamics of CH4 and CO2 in the waterlogged environment of an islan...

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Autores principales: Sanci, R., Panarello, H.O.
Formato: JOUR
Materias:
C isotope tracer
CH4 pools
Deep gases
Wetland
Biogeochemistry
Biological materials
Carbon dioxide
Isotopes
Organic carbon
Oxidation
Sediments
Soil moisture
Wetlands
Atmospheric release
Concentration Measurement
Geochemical characterization
Isotope tracers
Total Organic Carbon
Ultrasonic degassing
Waterlogged environments
Underwater soils
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01676369_v190_n11_p_Sanci
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_01676369_v190_n11_p_Sanci
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spelling todo:paper_01676369_v190_n11_p_Sanci2023-10-03T15:05:00Z Distribution and isotopic signature of deep gases in submerged soils in an island of the Lower Delta of the Paraná River, Argentina Sanci, R. Panarello, H.O. C isotope tracer CH4 pools Deep gases Wetland Biogeochemistry Biological materials Carbon dioxide Isotopes Organic carbon Oxidation Sediments Soil moisture Wetlands Atmospheric release CH4 pools Concentration Measurement Geochemical characterization Isotope tracers Total Organic Carbon Ultrasonic degassing Waterlogged environments Underwater soils Subsoil CH4 and CO2 concentrations, δ13C-CH4 and δ13C-CO2 signatures, total organic carbon (TOC) and δ13C-TOC, together with C/N ratio of organic matter, were evaluated throughout a soil profile up to the atmosphere to understand the dynamics of CH4 and CO2 in the waterlogged environment of an island of the Lower Delta of the Paraná River, Argentina. The analysis of the vertical profile showed that a significant fraction of CH4 exists as gas trapped within the sediment column, compared to CH4 dissolved in soil solution. CH4 concentration measurements in sub-saturated soils showed that free CH4 is 1 order of magnitude smaller than CH4 recovered from soil cores by ultrasonic degassing. The highest concentrations of CH4 occurred at the 90–120-cm layer. At this depth, δ13C-CH4 values resulting from methanogenesis were around − 71‰, which is well within the range of CH4 produced from CO2 reduction, and δ13C values of the associated CO2 were enriched (~ − 7‰). Isotope mass balance models used to calculate the fraction of oxidized CH4 indicated that around 30% of the CH4 produced was oxidized prior to atmospheric release. In contrast to methanogenesis, during oxidation processes δ13C-CH4 shifts to more positive values. The mineralogical, textural, isotopic, and geochemical characterization of subsoil sediments with abundant organic matter, like Paraná Delta, demonstrated that CH4 storage capacity of the soil, production, consumption, and transport are the main factors in regulating the actual flux rates of CH4 to the atmosphere. © 2018, Springer Nature Switzerland AG. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01676369_v190_n11_p_Sanci
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic C isotope tracer
CH4 pools
Deep gases
Wetland
Biogeochemistry
Biological materials
Carbon dioxide
Isotopes
Organic carbon
Oxidation
Sediments
Soil moisture
Wetlands
Atmospheric release
CH4 pools
Concentration Measurement
Geochemical characterization
Isotope tracers
Total Organic Carbon
Ultrasonic degassing
Waterlogged environments
Underwater soils
spellingShingle C isotope tracer
CH4 pools
Deep gases
Wetland
Biogeochemistry
Biological materials
Carbon dioxide
Isotopes
Organic carbon
Oxidation
Sediments
Soil moisture
Wetlands
Atmospheric release
CH4 pools
Concentration Measurement
Geochemical characterization
Isotope tracers
Total Organic Carbon
Ultrasonic degassing
Waterlogged environments
Underwater soils
Sanci, R.
Panarello, H.O.
Distribution and isotopic signature of deep gases in submerged soils in an island of the Lower Delta of the Paraná River, Argentina
topic_facet C isotope tracer
CH4 pools
Deep gases
Wetland
Biogeochemistry
Biological materials
Carbon dioxide
Isotopes
Organic carbon
Oxidation
Sediments
Soil moisture
Wetlands
Atmospheric release
CH4 pools
Concentration Measurement
Geochemical characterization
Isotope tracers
Total Organic Carbon
Ultrasonic degassing
Waterlogged environments
Underwater soils
description Subsoil CH4 and CO2 concentrations, δ13C-CH4 and δ13C-CO2 signatures, total organic carbon (TOC) and δ13C-TOC, together with C/N ratio of organic matter, were evaluated throughout a soil profile up to the atmosphere to understand the dynamics of CH4 and CO2 in the waterlogged environment of an island of the Lower Delta of the Paraná River, Argentina. The analysis of the vertical profile showed that a significant fraction of CH4 exists as gas trapped within the sediment column, compared to CH4 dissolved in soil solution. CH4 concentration measurements in sub-saturated soils showed that free CH4 is 1 order of magnitude smaller than CH4 recovered from soil cores by ultrasonic degassing. The highest concentrations of CH4 occurred at the 90–120-cm layer. At this depth, δ13C-CH4 values resulting from methanogenesis were around − 71‰, which is well within the range of CH4 produced from CO2 reduction, and δ13C values of the associated CO2 were enriched (~ − 7‰). Isotope mass balance models used to calculate the fraction of oxidized CH4 indicated that around 30% of the CH4 produced was oxidized prior to atmospheric release. In contrast to methanogenesis, during oxidation processes δ13C-CH4 shifts to more positive values. The mineralogical, textural, isotopic, and geochemical characterization of subsoil sediments with abundant organic matter, like Paraná Delta, demonstrated that CH4 storage capacity of the soil, production, consumption, and transport are the main factors in regulating the actual flux rates of CH4 to the atmosphere. © 2018, Springer Nature Switzerland AG.
format JOUR
author Sanci, R.
Panarello, H.O.
author_facet Sanci, R.
Panarello, H.O.
author_sort Sanci, R.
title Distribution and isotopic signature of deep gases in submerged soils in an island of the Lower Delta of the Paraná River, Argentina
title_short Distribution and isotopic signature of deep gases in submerged soils in an island of the Lower Delta of the Paraná River, Argentina
title_full Distribution and isotopic signature of deep gases in submerged soils in an island of the Lower Delta of the Paraná River, Argentina
title_fullStr Distribution and isotopic signature of deep gases in submerged soils in an island of the Lower Delta of the Paraná River, Argentina
title_full_unstemmed Distribution and isotopic signature of deep gases in submerged soils in an island of the Lower Delta of the Paraná River, Argentina
title_sort distribution and isotopic signature of deep gases in submerged soils in an island of the lower delta of the paraná river, argentina
url http://hdl.handle.net/20.500.12110/paper_01676369_v190_n11_p_Sanci
work_keys_str_mv AT sancir distributionandisotopicsignatureofdeepgasesinsubmergedsoilsinanislandofthelowerdeltaoftheparanariverargentina
AT panarelloho distributionandisotopicsignatureofdeepgasesinsubmergedsoilsinanislandofthelowerdeltaoftheparanariverargentina
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