Anaerobic Methane Oxidation in High-Arctic Alaskan Peatlands as a Significant Control on Net CH4 Fluxes
Terrestrial consumption of the potent greenhouse gas methane (CH4) is a critical aspect of the future climate, as CH4 concentrations in the atmosphere are projected to play an increasingly important role in global climate forcing. Anaerobic oxidation of methane (AOM) has only recently been considere...
Main Authors: | , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
eScholarship, University of California
2019
|
Subjects: | |
Online Access: | https://escholarship.org/uc/item/2w941167 |
id |
ftcdlib:oai:escholarship.org:ark:/13030/qt2w941167 |
---|---|
record_format |
openpolar |
spelling |
ftcdlib:oai:escholarship.org:ark:/13030/qt2w941167 2023-11-05T03:39:04+01:00 Anaerobic Methane Oxidation in High-Arctic Alaskan Peatlands as a Significant Control on Net CH4 Fluxes Miller, Kimberley E Lai, Chun-Ta Dahlgren, Randy A Lipson, David A 7 2019-01-01 application/pdf https://escholarship.org/uc/item/2w941167 unknown eScholarship, University of California qt2w941167 https://escholarship.org/uc/item/2w941167 public Soil Systems, vol 3, iss 1 Environmental Sciences Soil Sciences Climate Action Arctic Coastal Plain methane emissions AOM ANME iron isotope pool dilution drained thaw lake basin metal-dependent AOM article 2019 ftcdlib 2023-10-09T18:05:33Z Terrestrial consumption of the potent greenhouse gas methane (CH4) is a critical aspect of the future climate, as CH4 concentrations in the atmosphere are projected to play an increasingly important role in global climate forcing. Anaerobic oxidation of methane (AOM) has only recently been considered a relevant control on methane fluxes from terrestrial systems. We performed in vitro anoxic incubations of intact peat from Utqiaġvik (Barrow), Alaska using stable isotope tracers. Our results showed an average potential AOM rate of 15.0 nmol cm3 h−1, surpassing the average rate of gross CH4 production (6.0 nmol cm3 h−1). AOM and CH4 production rates were positively correlated. While CH4 production was insensitive to additions of Fe(III), there was a depth:Fe(III) interaction in the kinetic reaction rate constant for AOM, suggestive of stimulation by Fe(III), particularly in shallow soils (<10 cm). We estimate AOM would consume 25–34% of CH4 produced under ambient conditions. Soil genetic surveys showed phylogenetic links between soil microbes and known anaerobic methanotrophs in ANME groups 2 and 3. These results suggest a prevalent role of AOM to net CH4 fluxes from Arctic peatland ecosystems, and a probable link with Fe(III)-reduction. Article in Journal/Newspaper Arctic Barrow Alaska University of California: eScholarship |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Environmental Sciences Soil Sciences Climate Action Arctic Coastal Plain methane emissions AOM ANME iron isotope pool dilution drained thaw lake basin metal-dependent AOM |
spellingShingle |
Environmental Sciences Soil Sciences Climate Action Arctic Coastal Plain methane emissions AOM ANME iron isotope pool dilution drained thaw lake basin metal-dependent AOM Miller, Kimberley E Lai, Chun-Ta Dahlgren, Randy A Lipson, David A Anaerobic Methane Oxidation in High-Arctic Alaskan Peatlands as a Significant Control on Net CH4 Fluxes |
topic_facet |
Environmental Sciences Soil Sciences Climate Action Arctic Coastal Plain methane emissions AOM ANME iron isotope pool dilution drained thaw lake basin metal-dependent AOM |
description |
Terrestrial consumption of the potent greenhouse gas methane (CH4) is a critical aspect of the future climate, as CH4 concentrations in the atmosphere are projected to play an increasingly important role in global climate forcing. Anaerobic oxidation of methane (AOM) has only recently been considered a relevant control on methane fluxes from terrestrial systems. We performed in vitro anoxic incubations of intact peat from Utqiaġvik (Barrow), Alaska using stable isotope tracers. Our results showed an average potential AOM rate of 15.0 nmol cm3 h−1, surpassing the average rate of gross CH4 production (6.0 nmol cm3 h−1). AOM and CH4 production rates were positively correlated. While CH4 production was insensitive to additions of Fe(III), there was a depth:Fe(III) interaction in the kinetic reaction rate constant for AOM, suggestive of stimulation by Fe(III), particularly in shallow soils (<10 cm). We estimate AOM would consume 25–34% of CH4 produced under ambient conditions. Soil genetic surveys showed phylogenetic links between soil microbes and known anaerobic methanotrophs in ANME groups 2 and 3. These results suggest a prevalent role of AOM to net CH4 fluxes from Arctic peatland ecosystems, and a probable link with Fe(III)-reduction. |
format |
Article in Journal/Newspaper |
author |
Miller, Kimberley E Lai, Chun-Ta Dahlgren, Randy A Lipson, David A |
author_facet |
Miller, Kimberley E Lai, Chun-Ta Dahlgren, Randy A Lipson, David A |
author_sort |
Miller, Kimberley E |
title |
Anaerobic Methane Oxidation in High-Arctic Alaskan Peatlands as a Significant Control on Net CH4 Fluxes |
title_short |
Anaerobic Methane Oxidation in High-Arctic Alaskan Peatlands as a Significant Control on Net CH4 Fluxes |
title_full |
Anaerobic Methane Oxidation in High-Arctic Alaskan Peatlands as a Significant Control on Net CH4 Fluxes |
title_fullStr |
Anaerobic Methane Oxidation in High-Arctic Alaskan Peatlands as a Significant Control on Net CH4 Fluxes |
title_full_unstemmed |
Anaerobic Methane Oxidation in High-Arctic Alaskan Peatlands as a Significant Control on Net CH4 Fluxes |
title_sort |
anaerobic methane oxidation in high-arctic alaskan peatlands as a significant control on net ch4 fluxes |
publisher |
eScholarship, University of California |
publishDate |
2019 |
url |
https://escholarship.org/uc/item/2w941167 |
op_coverage |
7 |
genre |
Arctic Barrow Alaska |
genre_facet |
Arctic Barrow Alaska |
op_source |
Soil Systems, vol 3, iss 1 |
op_relation |
qt2w941167 https://escholarship.org/uc/item/2w941167 |
op_rights |
public |
_version_ |
1781694854277890048 |