Terrestrial-aquatic transfers of carbon dioxide, methane, and organic carbon from riparian wetlands to an arctic headwater stream
Transfers of dissolved gases from land contribute to gas evasion from surface waters. Although headwater streams may contribute strongly to overall gas evasion in a river network, the dynamics of CO2 and CH4 transfers between riparian wetlands and headwater streams are poorly understood. Imnavait Cr...
Main Author: | |
---|---|
Other Authors: | , , |
Format: | Thesis |
Language: | English |
Published: |
2014
|
Subjects: | |
Online Access: | https://hdl.handle.net/2027.42/107433 |
id |
ftumdeepblue:oai:deepblue.lib.umich.edu:2027.42/107433 |
---|---|
record_format |
openpolar |
spelling |
ftumdeepblue:oai:deepblue.lib.umich.edu:2027.42/107433 2024-01-07T09:41:29+01:00 Terrestrial-aquatic transfers of carbon dioxide, methane, and organic carbon from riparian wetlands to an arctic headwater stream Miller, Benjamin Kling, George W. Nadelhoffer, Knute J. Neilson, Bethany T. 2014-06-17 application/pdf https://hdl.handle.net/2027.42/107433 en_US eng https://hdl.handle.net/2027.42/107433 blmill Carbon Dioxide Methane Arctic Headwater Stream Biogeochemistry Aquatic Ecology Ecology Thesis 2014 ftumdeepblue 2023-12-10T17:43:15Z Transfers of dissolved gases from land contribute to gas evasion from surface waters. Although headwater streams may contribute strongly to overall gas evasion in a river network, the dynamics of CO2 and CH4 transfers between riparian wetlands and headwater streams are poorly understood. Imnavait Creek, a peat-bottom, beaded arctic headwater stream, was studied to determine the relative importance of CO2, CH4, and dissolved organic carbon (DOC) fluxes from surface inflow, in-stream processing such as photo-mineralization, and subsurface lateral inflows draining riparian wetland soils at different depths. Although concentrations of CO2 and CH4 were 1-2 orders of magnitude higher in subsurface lateral inflows than in surface waters, subsurface discharge was >0.1% of surface discharge along the studied reach of Imnavait. This means that 91-97% of the C entering and leaving this reach was introduced by surface inflows. Integrating the subsurface inflows per meter of stream reach above the study site provided the distances required to account for surface water concentrations at the upstream entry to the study reach. Assuming that subsurface inflows were similar along the entire stream, these distances were 120-363 m for CO2, 41-47 m for CH4, and 36 m for DOC. All of these distances were much less than the distance to Imnavait’s headwater source (~430 m), implying a loss of gases through evasion to the atmosphere and a loss of DOC through photochemical or biological conversion to CO2 from upstream to downstream. Furthermore, concentrations of CO2 were significantly higher upstream (p=0.02), while CH4 concentrations were significantly higher downstream (p<0.001). CO2 evasion from the surface of Imnavait pools was 14-30% of the CO2 imported within subsurface lateral inflows, while CH4 evasion was only 4-6%. Both CO2 and CH4 evasion increased significantly during periods of thermal stratification in the pools (p<0.001 and p=0.02, respectively), when concentrations of these gases increased in bottom waters ... Thesis Arctic University of Michigan: Deep Blue Arctic |
institution |
Open Polar |
collection |
University of Michigan: Deep Blue |
op_collection_id |
ftumdeepblue |
language |
English |
topic |
Carbon Dioxide Methane Arctic Headwater Stream Biogeochemistry Aquatic Ecology Ecology |
spellingShingle |
Carbon Dioxide Methane Arctic Headwater Stream Biogeochemistry Aquatic Ecology Ecology Miller, Benjamin Terrestrial-aquatic transfers of carbon dioxide, methane, and organic carbon from riparian wetlands to an arctic headwater stream |
topic_facet |
Carbon Dioxide Methane Arctic Headwater Stream Biogeochemistry Aquatic Ecology Ecology |
description |
Transfers of dissolved gases from land contribute to gas evasion from surface waters. Although headwater streams may contribute strongly to overall gas evasion in a river network, the dynamics of CO2 and CH4 transfers between riparian wetlands and headwater streams are poorly understood. Imnavait Creek, a peat-bottom, beaded arctic headwater stream, was studied to determine the relative importance of CO2, CH4, and dissolved organic carbon (DOC) fluxes from surface inflow, in-stream processing such as photo-mineralization, and subsurface lateral inflows draining riparian wetland soils at different depths. Although concentrations of CO2 and CH4 were 1-2 orders of magnitude higher in subsurface lateral inflows than in surface waters, subsurface discharge was >0.1% of surface discharge along the studied reach of Imnavait. This means that 91-97% of the C entering and leaving this reach was introduced by surface inflows. Integrating the subsurface inflows per meter of stream reach above the study site provided the distances required to account for surface water concentrations at the upstream entry to the study reach. Assuming that subsurface inflows were similar along the entire stream, these distances were 120-363 m for CO2, 41-47 m for CH4, and 36 m for DOC. All of these distances were much less than the distance to Imnavait’s headwater source (~430 m), implying a loss of gases through evasion to the atmosphere and a loss of DOC through photochemical or biological conversion to CO2 from upstream to downstream. Furthermore, concentrations of CO2 were significantly higher upstream (p=0.02), while CH4 concentrations were significantly higher downstream (p<0.001). CO2 evasion from the surface of Imnavait pools was 14-30% of the CO2 imported within subsurface lateral inflows, while CH4 evasion was only 4-6%. Both CO2 and CH4 evasion increased significantly during periods of thermal stratification in the pools (p<0.001 and p=0.02, respectively), when concentrations of these gases increased in bottom waters ... |
author2 |
Kling, George W. Nadelhoffer, Knute J. Neilson, Bethany T. |
format |
Thesis |
author |
Miller, Benjamin |
author_facet |
Miller, Benjamin |
author_sort |
Miller, Benjamin |
title |
Terrestrial-aquatic transfers of carbon dioxide, methane, and organic carbon from riparian wetlands to an arctic headwater stream |
title_short |
Terrestrial-aquatic transfers of carbon dioxide, methane, and organic carbon from riparian wetlands to an arctic headwater stream |
title_full |
Terrestrial-aquatic transfers of carbon dioxide, methane, and organic carbon from riparian wetlands to an arctic headwater stream |
title_fullStr |
Terrestrial-aquatic transfers of carbon dioxide, methane, and organic carbon from riparian wetlands to an arctic headwater stream |
title_full_unstemmed |
Terrestrial-aquatic transfers of carbon dioxide, methane, and organic carbon from riparian wetlands to an arctic headwater stream |
title_sort |
terrestrial-aquatic transfers of carbon dioxide, methane, and organic carbon from riparian wetlands to an arctic headwater stream |
publishDate |
2014 |
url |
https://hdl.handle.net/2027.42/107433 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
https://hdl.handle.net/2027.42/107433 blmill |
_version_ |
1787422283070963712 |