Ebullitive methane emissions from oxygenated wetland streams

John T. Crawford, Emily H. Stanley, Seth A. Spawn, Jacques C Finlay, Luke C. Loken, Robert G. Striegl

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Stream and river carbon dioxide emissions are an important component of the global carbon cycle. Methane emissions from streams could also contribute to regional or global greenhouse gas cycling, but there are relatively few data regarding stream and river methane emissions. Furthermore, the available data do not typically include the ebullitive (bubble-mediated) pathway, instead focusing on emission of dissolved methane by diffusion or convection. Here, we show the importance of ebullitive methane emissions from small streams in the regional greenhouse gas balance of a lake and wetland-dominated landscape in temperate North America and identify the origin of the methane emitted from these well-oxygenated streams. Stream methane flux densities from this landscape tended to exceed those of nearby wetland diffusive fluxes as well as average global wetland ebullitive fluxes. Total stream ebullitive methane flux at the regional scale (103 Mg C yr-1; over 6400 km2) was of the same magnitude as diffusive methane flux previously documented at the same scale. Organic-rich stream sediments had the highest rates of bubble release and higher enrichment of methane in bubbles, but glacial sand sediments also exhibited high bubble emissions relative to other studied environments. Our results from a database of groundwater chemistry support the hypothesis that methane in bubbles is produced in anoxic near-stream sediment porewaters, and not in deeper, oxygenated groundwaters. Methane interacts with other key elemental cycles such as nitrogen, oxygen, and sulfur, which has implications for ecosystem changes such as drought and increased nutrient loading. Our results support the contention that streams, particularly those draining wetland landscapes of the northern hemisphere, are an important component of the global methane cycle.

Original languageEnglish (US)
Pages (from-to)3408-3422
Number of pages15
JournalGlobal change biology
Volume20
Issue number11
DOIs
StatePublished - Nov 1 2014

Fingerprint

Methane
Wetlands
methane
wetland
bubble
Fluxes
Sediments
Greenhouse gases
fluvial deposit
Groundwater
greenhouse gas
Rivers
groundwater
Drought
Sulfur
carbon cycle
river
Carbon Dioxide
Ecosystems
Nutrients

Keywords

  • Carbon dioxide
  • Ebullition
  • Methane
  • Rivers
  • Upscaling
  • Wetlands

Cite this

Crawford, J. T., Stanley, E. H., Spawn, S. A., Finlay, J. C., Loken, L. C., & Striegl, R. G. (2014). Ebullitive methane emissions from oxygenated wetland streams. Global change biology, 20(11), 3408-3422. https://doi.org/10.1111/gcb.12614

Ebullitive methane emissions from oxygenated wetland streams. / Crawford, John T.; Stanley, Emily H.; Spawn, Seth A.; Finlay, Jacques C; Loken, Luke C.; Striegl, Robert G.

In: Global change biology, Vol. 20, No. 11, 01.11.2014, p. 3408-3422.

Research output: Contribution to journalArticle

Crawford, JT, Stanley, EH, Spawn, SA, Finlay, JC, Loken, LC & Striegl, RG 2014, 'Ebullitive methane emissions from oxygenated wetland streams', Global change biology, vol. 20, no. 11, pp. 3408-3422. https://doi.org/10.1111/gcb.12614
Crawford JT, Stanley EH, Spawn SA, Finlay JC, Loken LC, Striegl RG. Ebullitive methane emissions from oxygenated wetland streams. Global change biology. 2014 Nov 1;20(11):3408-3422. https://doi.org/10.1111/gcb.12614
Crawford, John T. ; Stanley, Emily H. ; Spawn, Seth A. ; Finlay, Jacques C ; Loken, Luke C. ; Striegl, Robert G. / Ebullitive methane emissions from oxygenated wetland streams. In: Global change biology. 2014 ; Vol. 20, No. 11. pp. 3408-3422.
@article{494282d6e8a141eca5796ca8eff9ff2d,
title = "Ebullitive methane emissions from oxygenated wetland streams",
abstract = "Stream and river carbon dioxide emissions are an important component of the global carbon cycle. Methane emissions from streams could also contribute to regional or global greenhouse gas cycling, but there are relatively few data regarding stream and river methane emissions. Furthermore, the available data do not typically include the ebullitive (bubble-mediated) pathway, instead focusing on emission of dissolved methane by diffusion or convection. Here, we show the importance of ebullitive methane emissions from small streams in the regional greenhouse gas balance of a lake and wetland-dominated landscape in temperate North America and identify the origin of the methane emitted from these well-oxygenated streams. Stream methane flux densities from this landscape tended to exceed those of nearby wetland diffusive fluxes as well as average global wetland ebullitive fluxes. Total stream ebullitive methane flux at the regional scale (103 Mg C yr-1; over 6400 km2) was of the same magnitude as diffusive methane flux previously documented at the same scale. Organic-rich stream sediments had the highest rates of bubble release and higher enrichment of methane in bubbles, but glacial sand sediments also exhibited high bubble emissions relative to other studied environments. Our results from a database of groundwater chemistry support the hypothesis that methane in bubbles is produced in anoxic near-stream sediment porewaters, and not in deeper, oxygenated groundwaters. Methane interacts with other key elemental cycles such as nitrogen, oxygen, and sulfur, which has implications for ecosystem changes such as drought and increased nutrient loading. Our results support the contention that streams, particularly those draining wetland landscapes of the northern hemisphere, are an important component of the global methane cycle.",
keywords = "Carbon dioxide, Ebullition, Methane, Rivers, Upscaling, Wetlands",
author = "Crawford, {John T.} and Stanley, {Emily H.} and Spawn, {Seth A.} and Finlay, {Jacques C} and Loken, {Luke C.} and Striegl, {Robert G.}",
year = "2014",
month = "11",
day = "1",
doi = "10.1111/gcb.12614",
language = "English (US)",
volume = "20",
pages = "3408--3422",
journal = "Global Change Biology",
issn = "1354-1013",
publisher = "Wiley-Blackwell",
number = "11",

}

TY - JOUR

T1 - Ebullitive methane emissions from oxygenated wetland streams

AU - Crawford, John T.

AU - Stanley, Emily H.

AU - Spawn, Seth A.

AU - Finlay, Jacques C

AU - Loken, Luke C.

AU - Striegl, Robert G.

PY - 2014/11/1

Y1 - 2014/11/1

N2 - Stream and river carbon dioxide emissions are an important component of the global carbon cycle. Methane emissions from streams could also contribute to regional or global greenhouse gas cycling, but there are relatively few data regarding stream and river methane emissions. Furthermore, the available data do not typically include the ebullitive (bubble-mediated) pathway, instead focusing on emission of dissolved methane by diffusion or convection. Here, we show the importance of ebullitive methane emissions from small streams in the regional greenhouse gas balance of a lake and wetland-dominated landscape in temperate North America and identify the origin of the methane emitted from these well-oxygenated streams. Stream methane flux densities from this landscape tended to exceed those of nearby wetland diffusive fluxes as well as average global wetland ebullitive fluxes. Total stream ebullitive methane flux at the regional scale (103 Mg C yr-1; over 6400 km2) was of the same magnitude as diffusive methane flux previously documented at the same scale. Organic-rich stream sediments had the highest rates of bubble release and higher enrichment of methane in bubbles, but glacial sand sediments also exhibited high bubble emissions relative to other studied environments. Our results from a database of groundwater chemistry support the hypothesis that methane in bubbles is produced in anoxic near-stream sediment porewaters, and not in deeper, oxygenated groundwaters. Methane interacts with other key elemental cycles such as nitrogen, oxygen, and sulfur, which has implications for ecosystem changes such as drought and increased nutrient loading. Our results support the contention that streams, particularly those draining wetland landscapes of the northern hemisphere, are an important component of the global methane cycle.

AB - Stream and river carbon dioxide emissions are an important component of the global carbon cycle. Methane emissions from streams could also contribute to regional or global greenhouse gas cycling, but there are relatively few data regarding stream and river methane emissions. Furthermore, the available data do not typically include the ebullitive (bubble-mediated) pathway, instead focusing on emission of dissolved methane by diffusion or convection. Here, we show the importance of ebullitive methane emissions from small streams in the regional greenhouse gas balance of a lake and wetland-dominated landscape in temperate North America and identify the origin of the methane emitted from these well-oxygenated streams. Stream methane flux densities from this landscape tended to exceed those of nearby wetland diffusive fluxes as well as average global wetland ebullitive fluxes. Total stream ebullitive methane flux at the regional scale (103 Mg C yr-1; over 6400 km2) was of the same magnitude as diffusive methane flux previously documented at the same scale. Organic-rich stream sediments had the highest rates of bubble release and higher enrichment of methane in bubbles, but glacial sand sediments also exhibited high bubble emissions relative to other studied environments. Our results from a database of groundwater chemistry support the hypothesis that methane in bubbles is produced in anoxic near-stream sediment porewaters, and not in deeper, oxygenated groundwaters. Methane interacts with other key elemental cycles such as nitrogen, oxygen, and sulfur, which has implications for ecosystem changes such as drought and increased nutrient loading. Our results support the contention that streams, particularly those draining wetland landscapes of the northern hemisphere, are an important component of the global methane cycle.

KW - Carbon dioxide

KW - Ebullition

KW - Methane

KW - Rivers

KW - Upscaling

KW - Wetlands

UR - http://www.scopus.com/inward/record.url?scp=84907904013&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84907904013&partnerID=8YFLogxK

U2 - 10.1111/gcb.12614

DO - 10.1111/gcb.12614

M3 - Article

VL - 20

SP - 3408

EP - 3422

JO - Global Change Biology

JF - Global Change Biology

SN - 1354-1013

IS - 11

ER -