Environmental controls on CH4 emission from polygonal tundra on the micro-site scale in the Lena River Delta, Siberia
International audience The carbon budgets of the atmosphere and terrestrial ecosystems are closely coupled by vertical gas exchange fluxes. Uncertainties remain with respect to high latitude ecosystems and the processes driving their temporally and spatially highly variable methane exchange. Problem...
Published in: | Global Change Biology |
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ftccsdartic:oai:HAL:hal-00552619v1 2023-05-15T17:07:38+02:00 Environmental controls on CH4 emission from polygonal tundra on the micro-site scale in the Lena River Delta, Siberia Sachs, Torsten Giebels, Michael Boike, Julia Kutzbach, Lars Alfred Wegener Institute Potsdam Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI) Institute of Geoecology Technische Universität Braunschweig = Technical University of Braunschweig Braunschweig Institute for Landscape Matter Dynamics Leibniz-Zentrum für Agrarlandschaftsforschung = Leibniz Centre for Agricultural Landscape Research (ZALF) Institute of Botany and Landscape Ecology Universität Greifswald - University of Greifswald Institute of Soil Science University of Hamburg 2010-04-14 https://hal.archives-ouvertes.fr/hal-00552619 https://hal.archives-ouvertes.fr/hal-00552619/document https://hal.archives-ouvertes.fr/hal-00552619/file/PEER_stage2_10.1111%252Fj.1365-2486.2010.02232.x.pdf https://doi.org/10.1111/j.1365-2486.2010.02232.x en eng HAL CCSD Wiley info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2486.2010.02232.x hal-00552619 https://hal.archives-ouvertes.fr/hal-00552619 https://hal.archives-ouvertes.fr/hal-00552619/document https://hal.archives-ouvertes.fr/hal-00552619/file/PEER_stage2_10.1111%252Fj.1365-2486.2010.02232.x.pdf doi:10.1111/j.1365-2486.2010.02232.x info:eu-repo/semantics/OpenAccess ISSN: 1354-1013 EISSN: 1365-2486 Global Change Biology https://hal.archives-ouvertes.fr/hal-00552619 Global Change Biology, Wiley, 2010, ⟨10.1111/j.1365-2486.2010.02232.x⟩ Life Sciences info:eu-repo/semantics/article Journal articles 2010 ftccsdartic https://doi.org/10.1111/j.1365-2486.2010.02232.x 2021-11-21T04:33:25Z International audience The carbon budgets of the atmosphere and terrestrial ecosystems are closely coupled by vertical gas exchange fluxes. Uncertainties remain with respect to high latitude ecosystems and the processes driving their temporally and spatially highly variable methane exchange. Problems associated with scaling plot measurements to larger areas in heterogeneous environments are addressed based on intensive field studies on two nested spatial scales in Northern Siberia. Methane fluxes on the micro-site scale (0.1–100 m2) were measured in the Lena River Delta from July through September 2006 by closed chambers and were compared to simultaneous ecosystem scale (104 m2–106 m2) flux measurements by the eddy covariance method. Closed chamber measurements were conducted almost daily on 15 plots in four differently developed polygon centers and on a polygon rim. Controls on methane emission were identified by stepwise multiple regression. In contrast to relatively low ecosystem-scale fluxes controlled mainly by near-surface turbulence, fluxes on the micro-site scale were almost an order of magnitude higher at the wet polygon centers and near zero at the drier polygon rim and high-center polygon. Micro-site scale methane fluxes varied strongly even within the same micro-sites. The only statistically significant control on chamber-based fluxes was surface temperature calculated using the Stefan-Boltzmann equation in the wet polygon centers, while no significant control was found for the low emissions from the dry sites. The comparison with the eddy covariance measurements reveals differences in controls and the seasonal dynamics between the two measurement scales, which may have consequences for scaling and process-based models. Despite those differences, closed-chamber measurements from within the eddy covariance footprint could be scaled by an area-weighting approach of landcover classes based on high-resolution imagery to match the total ecosystem-scale emission. Our nested sampling design allowed for ... Article in Journal/Newspaper lena river Tundra Siberia Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Global Change Biology no no |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Life Sciences |
spellingShingle |
Life Sciences Sachs, Torsten Giebels, Michael Boike, Julia Kutzbach, Lars Environmental controls on CH4 emission from polygonal tundra on the micro-site scale in the Lena River Delta, Siberia |
topic_facet |
Life Sciences |
description |
International audience The carbon budgets of the atmosphere and terrestrial ecosystems are closely coupled by vertical gas exchange fluxes. Uncertainties remain with respect to high latitude ecosystems and the processes driving their temporally and spatially highly variable methane exchange. Problems associated with scaling plot measurements to larger areas in heterogeneous environments are addressed based on intensive field studies on two nested spatial scales in Northern Siberia. Methane fluxes on the micro-site scale (0.1–100 m2) were measured in the Lena River Delta from July through September 2006 by closed chambers and were compared to simultaneous ecosystem scale (104 m2–106 m2) flux measurements by the eddy covariance method. Closed chamber measurements were conducted almost daily on 15 plots in four differently developed polygon centers and on a polygon rim. Controls on methane emission were identified by stepwise multiple regression. In contrast to relatively low ecosystem-scale fluxes controlled mainly by near-surface turbulence, fluxes on the micro-site scale were almost an order of magnitude higher at the wet polygon centers and near zero at the drier polygon rim and high-center polygon. Micro-site scale methane fluxes varied strongly even within the same micro-sites. The only statistically significant control on chamber-based fluxes was surface temperature calculated using the Stefan-Boltzmann equation in the wet polygon centers, while no significant control was found for the low emissions from the dry sites. The comparison with the eddy covariance measurements reveals differences in controls and the seasonal dynamics between the two measurement scales, which may have consequences for scaling and process-based models. Despite those differences, closed-chamber measurements from within the eddy covariance footprint could be scaled by an area-weighting approach of landcover classes based on high-resolution imagery to match the total ecosystem-scale emission. Our nested sampling design allowed for ... |
author2 |
Alfred Wegener Institute Potsdam Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI) Institute of Geoecology Technische Universität Braunschweig = Technical University of Braunschweig Braunschweig Institute for Landscape Matter Dynamics Leibniz-Zentrum für Agrarlandschaftsforschung = Leibniz Centre for Agricultural Landscape Research (ZALF) Institute of Botany and Landscape Ecology Universität Greifswald - University of Greifswald Institute of Soil Science University of Hamburg |
format |
Article in Journal/Newspaper |
author |
Sachs, Torsten Giebels, Michael Boike, Julia Kutzbach, Lars |
author_facet |
Sachs, Torsten Giebels, Michael Boike, Julia Kutzbach, Lars |
author_sort |
Sachs, Torsten |
title |
Environmental controls on CH4 emission from polygonal tundra on the micro-site scale in the Lena River Delta, Siberia |
title_short |
Environmental controls on CH4 emission from polygonal tundra on the micro-site scale in the Lena River Delta, Siberia |
title_full |
Environmental controls on CH4 emission from polygonal tundra on the micro-site scale in the Lena River Delta, Siberia |
title_fullStr |
Environmental controls on CH4 emission from polygonal tundra on the micro-site scale in the Lena River Delta, Siberia |
title_full_unstemmed |
Environmental controls on CH4 emission from polygonal tundra on the micro-site scale in the Lena River Delta, Siberia |
title_sort |
environmental controls on ch4 emission from polygonal tundra on the micro-site scale in the lena river delta, siberia |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://hal.archives-ouvertes.fr/hal-00552619 https://hal.archives-ouvertes.fr/hal-00552619/document https://hal.archives-ouvertes.fr/hal-00552619/file/PEER_stage2_10.1111%252Fj.1365-2486.2010.02232.x.pdf https://doi.org/10.1111/j.1365-2486.2010.02232.x |
genre |
lena river Tundra Siberia |
genre_facet |
lena river Tundra Siberia |
op_source |
ISSN: 1354-1013 EISSN: 1365-2486 Global Change Biology https://hal.archives-ouvertes.fr/hal-00552619 Global Change Biology, Wiley, 2010, ⟨10.1111/j.1365-2486.2010.02232.x⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2486.2010.02232.x hal-00552619 https://hal.archives-ouvertes.fr/hal-00552619 https://hal.archives-ouvertes.fr/hal-00552619/document https://hal.archives-ouvertes.fr/hal-00552619/file/PEER_stage2_10.1111%252Fj.1365-2486.2010.02232.x.pdf doi:10.1111/j.1365-2486.2010.02232.x |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1111/j.1365-2486.2010.02232.x |
container_title |
Global Change Biology |
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no |
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1766063116734431232 |