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Title: Pathways and transformations of dissolved methane and dissolved inorganic carbon in Arctic tundra watersheds: Evidence from analysis of stable isotopes

Abstract

Arctic soils contain a large pool of terrestrial C and are of interest due to their potential for releasing significant carbon dioxide (CO 2) and methane (CH 4) to the atmosphere. Due to substantial landscape heterogeneity, predicting ecosystem-scale CH 4 and CO 2 production is challenging. This study assessed dissolved inorganic carbon (DIC = Σ (total) dissolved CO 2) and CH 4 in watershed drainages in Barrow, Alaska as critical convergent zones of regional geochemistry, substrates, and nutrients. In July and September of 2013, surface waters and saturated subsurface pore waters were collected from 17 drainages. Based on simultaneous DIC and CH 4 cycling, we synthesized isotopic and geochemical methods to develop a subsurface CH 4 and DIC balance by estimating mechanisms of CH 4 and DIC production and transport pathways and oxidation of subsurface CH 4. We observed a shift from acetoclastic (July) toward hydrogenotropic (September) methanogenesis at sites located toward the end of major freshwater drainages, adjacent to salty estuarine waters, suggesting an interesting landscape-scale effect on CH 4 production mechanism. The majority of subsurface CH 4 was transported upward by plant-mediated transport and ebullition, predominantly bypassing the potential for CH 4 oxidation. Thus, surprisingly, CH 4 oxidationmore » only consumed approximately 2.51± 0.82% (July) and 0.79 ± 0.79% (September) of CH 4 produced at the frost table, contributing to <0.1% of DIC production. DIC was primarily produced from respiration, with iron and organic matter serving as likely e- acceptors. Furthermore, this work highlights the importance of spatial and temporal variability of CH 4 production at the watershed scale and suggests broad scale investigations are required to build better regional or pan-Arctic representations of CH 4 and CO 2 production.« less

Authors:
 [1];  [1];  [1];  [1];  [2];  [1];  [1];  [2];  [2];  [3];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Work for Others (WFO); USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1267037
Alternate Identifier(s):
OSTI ID: 1440913
Grant/Contract Number:  
AC05-00OR22725; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Global Biogeochemical Cycles
Additional Journal Information:
Journal Volume: 29; Journal Issue: 11; Journal ID: ISSN 0886-6236
Publisher:
American Geophysical Union (AGU)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Throckmorton, Heather M., Heikoop, Jeffrey M., Newman, Brent D., Altmann, Garrett L., Conrad, Mark S., Muss, Jordan D., Perkins, George B., Smith, Lydia J., Torn, Margaret S., Wullschleger, Stan D., and Wilson, Cathy J. Pathways and transformations of dissolved methane and dissolved inorganic carbon in Arctic tundra watersheds: Evidence from analysis of stable isotopes. United States: N. p., 2015. Web. doi:10.1002/2014GB005044.
Throckmorton, Heather M., Heikoop, Jeffrey M., Newman, Brent D., Altmann, Garrett L., Conrad, Mark S., Muss, Jordan D., Perkins, George B., Smith, Lydia J., Torn, Margaret S., Wullschleger, Stan D., & Wilson, Cathy J. Pathways and transformations of dissolved methane and dissolved inorganic carbon in Arctic tundra watersheds: Evidence from analysis of stable isotopes. United States. doi:10.1002/2014GB005044.
Throckmorton, Heather M., Heikoop, Jeffrey M., Newman, Brent D., Altmann, Garrett L., Conrad, Mark S., Muss, Jordan D., Perkins, George B., Smith, Lydia J., Torn, Margaret S., Wullschleger, Stan D., and Wilson, Cathy J. Sun . "Pathways and transformations of dissolved methane and dissolved inorganic carbon in Arctic tundra watersheds: Evidence from analysis of stable isotopes". United States. doi:10.1002/2014GB005044. https://www.osti.gov/servlets/purl/1267037.
@article{osti_1267037,
title = {Pathways and transformations of dissolved methane and dissolved inorganic carbon in Arctic tundra watersheds: Evidence from analysis of stable isotopes},
author = {Throckmorton, Heather M. and Heikoop, Jeffrey M. and Newman, Brent D. and Altmann, Garrett L. and Conrad, Mark S. and Muss, Jordan D. and Perkins, George B. and Smith, Lydia J. and Torn, Margaret S. and Wullschleger, Stan D. and Wilson, Cathy J.},
abstractNote = {Arctic soils contain a large pool of terrestrial C and are of interest due to their potential for releasing significant carbon dioxide (CO2) and methane (CH4) to the atmosphere. Due to substantial landscape heterogeneity, predicting ecosystem-scale CH4 and CO2 production is challenging. This study assessed dissolved inorganic carbon (DIC = Σ (total) dissolved CO2) and CH4 in watershed drainages in Barrow, Alaska as critical convergent zones of regional geochemistry, substrates, and nutrients. In July and September of 2013, surface waters and saturated subsurface pore waters were collected from 17 drainages. Based on simultaneous DIC and CH4 cycling, we synthesized isotopic and geochemical methods to develop a subsurface CH4 and DIC balance by estimating mechanisms of CH4 and DIC production and transport pathways and oxidation of subsurface CH4. We observed a shift from acetoclastic (July) toward hydrogenotropic (September) methanogenesis at sites located toward the end of major freshwater drainages, adjacent to salty estuarine waters, suggesting an interesting landscape-scale effect on CH4 production mechanism. The majority of subsurface CH4 was transported upward by plant-mediated transport and ebullition, predominantly bypassing the potential for CH4 oxidation. Thus, surprisingly, CH4 oxidation only consumed approximately 2.51± 0.82% (July) and 0.79 ± 0.79% (September) of CH4 produced at the frost table, contributing to <0.1% of DIC production. DIC was primarily produced from respiration, with iron and organic matter serving as likely e- acceptors. Furthermore, this work highlights the importance of spatial and temporal variability of CH4 production at the watershed scale and suggests broad scale investigations are required to build better regional or pan-Arctic representations of CH4 and CO2 production.},
doi = {10.1002/2014GB005044},
journal = {Global Biogeochemical Cycles},
number = 11,
volume = 29,
place = {United States},
year = {2015},
month = {11}
}

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    Works referencing / citing this record:

    Landscape topography structures the soil microbiome in arctic polygonal tundra
    journal, February 2018


    Active layer hydrology in an arctic tundra ecosystem: quantifying water sources and cycling using water stable isotopes: Active Layer Hydrology in the Arctic Coastal Plain
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    • Throckmorton, Heather M.; Newman, Brent D.; Heikoop, Jeffrey M.
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