Environmental and physical controls on northern terrestrial methane emissions across permafrost zones
Abstract Methane ( CH 4 ) emissions from the northern high‐latitude region represent potentially significant biogeochemical feedbacks to the climate system. We compiled a database of growing‐season CH 4 emissions from terrestrial ecosystems located across permafrost zones, including 303 sites descri...
Published in: | Global Change Biology |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2012
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1111/gcb.12071 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fgcb.12071 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.12071 |
id |
crwiley:10.1111/gcb.12071 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1111/gcb.12071 2024-09-30T14:41:01+00:00 Environmental and physical controls on northern terrestrial methane emissions across permafrost zones Olefeldt, David Turetsky, Merritt R. Crill, Patrick M. McGuire, A. David 2012 http://dx.doi.org/10.1111/gcb.12071 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fgcb.12071 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.12071 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Global Change Biology volume 19, issue 2, page 589-603 ISSN 1354-1013 1365-2486 journal-article 2012 crwiley https://doi.org/10.1111/gcb.12071 2024-09-17T04:49:56Z Abstract Methane ( CH 4 ) emissions from the northern high‐latitude region represent potentially significant biogeochemical feedbacks to the climate system. We compiled a database of growing‐season CH 4 emissions from terrestrial ecosystems located across permafrost zones, including 303 sites described in 65 studies. Data on environmental and physical variables, including permafrost conditions, were used to assess controls on CH 4 emissions. Water table position, soil temperature, and vegetation composition strongly influenced emissions and had interacting effects. Sites with a dense sedge cover had higher emissions than other sites at comparable water table positions, and this was an effect that was more pronounced at low soil temperatures. Sensitivity analysis suggested that CH 4 emissions from ecosystems where the water table on average is at or above the soil surface (wet tundra, fen underlain by permafrost, and littoral ecosystems) are more sensitive to variability in soil temperature than drier ecosystems (palsa dry tundra, bog, and fen), whereas the latter ecosystems conversely are relatively more sensitive to changes of the water table position. Sites with near‐surface permafrost had lower CH 4 fluxes than sites without permafrost at comparable water table positions, a difference that was explained by lower soil temperatures. Neither the active layer depth nor the organic soil layer depth was related to CH 4 emissions. Permafrost thaw in lowland regions is often associated with increased soil moisture, higher soil temperatures, and increased sedge cover. In our database, lowland thermokarst sites generally had higher emissions than adjacent sites with intact permafrost, but emissions from thermokarst sites were not statistically higher than emissions from permafrost‐free sites with comparable environmental conditions. Overall, these results suggest that future changes to terrestrial high‐latitude CH 4 emissions will be more proximately related to changes in moisture, soil temperature, and vegetation ... Article in Journal/Newspaper palsa permafrost Thermokarst Tundra Wiley Online Library Global Change Biology 19 2 589 603 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract Methane ( CH 4 ) emissions from the northern high‐latitude region represent potentially significant biogeochemical feedbacks to the climate system. We compiled a database of growing‐season CH 4 emissions from terrestrial ecosystems located across permafrost zones, including 303 sites described in 65 studies. Data on environmental and physical variables, including permafrost conditions, were used to assess controls on CH 4 emissions. Water table position, soil temperature, and vegetation composition strongly influenced emissions and had interacting effects. Sites with a dense sedge cover had higher emissions than other sites at comparable water table positions, and this was an effect that was more pronounced at low soil temperatures. Sensitivity analysis suggested that CH 4 emissions from ecosystems where the water table on average is at or above the soil surface (wet tundra, fen underlain by permafrost, and littoral ecosystems) are more sensitive to variability in soil temperature than drier ecosystems (palsa dry tundra, bog, and fen), whereas the latter ecosystems conversely are relatively more sensitive to changes of the water table position. Sites with near‐surface permafrost had lower CH 4 fluxes than sites without permafrost at comparable water table positions, a difference that was explained by lower soil temperatures. Neither the active layer depth nor the organic soil layer depth was related to CH 4 emissions. Permafrost thaw in lowland regions is often associated with increased soil moisture, higher soil temperatures, and increased sedge cover. In our database, lowland thermokarst sites generally had higher emissions than adjacent sites with intact permafrost, but emissions from thermokarst sites were not statistically higher than emissions from permafrost‐free sites with comparable environmental conditions. Overall, these results suggest that future changes to terrestrial high‐latitude CH 4 emissions will be more proximately related to changes in moisture, soil temperature, and vegetation ... |
format |
Article in Journal/Newspaper |
author |
Olefeldt, David Turetsky, Merritt R. Crill, Patrick M. McGuire, A. David |
spellingShingle |
Olefeldt, David Turetsky, Merritt R. Crill, Patrick M. McGuire, A. David Environmental and physical controls on northern terrestrial methane emissions across permafrost zones |
author_facet |
Olefeldt, David Turetsky, Merritt R. Crill, Patrick M. McGuire, A. David |
author_sort |
Olefeldt, David |
title |
Environmental and physical controls on northern terrestrial methane emissions across permafrost zones |
title_short |
Environmental and physical controls on northern terrestrial methane emissions across permafrost zones |
title_full |
Environmental and physical controls on northern terrestrial methane emissions across permafrost zones |
title_fullStr |
Environmental and physical controls on northern terrestrial methane emissions across permafrost zones |
title_full_unstemmed |
Environmental and physical controls on northern terrestrial methane emissions across permafrost zones |
title_sort |
environmental and physical controls on northern terrestrial methane emissions across permafrost zones |
publisher |
Wiley |
publishDate |
2012 |
url |
http://dx.doi.org/10.1111/gcb.12071 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fgcb.12071 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.12071 |
genre |
palsa permafrost Thermokarst Tundra |
genre_facet |
palsa permafrost Thermokarst Tundra |
op_source |
Global Change Biology volume 19, issue 2, page 589-603 ISSN 1354-1013 1365-2486 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/gcb.12071 |
container_title |
Global Change Biology |
container_volume |
19 |
container_issue |
2 |
container_start_page |
589 |
op_container_end_page |
603 |
_version_ |
1811643459012919296 |