Arctic regional methane fluxes by ecotope as derived using eddy covariance from a low-flying aircraft
The Arctic terrestrial and sub-sea permafrost region contains approximately 30 % of the global carbon stock, and therefore understanding Arctic methane emissions and how they might change with a changing climate is important for quantifying the global methane budget and understanding its growth in t...
Published in: | Atmospheric Chemistry and Physics |
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00042326 2023-05-15T14:31:47+02:00 Arctic regional methane fluxes by ecotope as derived using eddy covariance from a low-flying aircraft Sayres, David S. Dobosy, Ronald Healy, Claire Dumas, Edward Kochendorfer, John Munster, Jason Wilkerson, Jordan Baker, Bruce Anderson, James G. 2017-07 electronic https://doi.org/10.5194/acp-17-8619-2017 https://noa.gwlb.de/receive/cop_mods_00042326 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00041946/acp-17-8619-2017.pdf https://acp.copernicus.org/articles/17/8619/2017/acp-17-8619-2017.pdf eng eng Copernicus Publications Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-17-8619-2017 https://noa.gwlb.de/receive/cop_mods_00042326 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00041946/acp-17-8619-2017.pdf https://acp.copernicus.org/articles/17/8619/2017/acp-17-8619-2017.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2017 ftnonlinearchiv https://doi.org/10.5194/acp-17-8619-2017 2022-02-08T22:41:06Z The Arctic terrestrial and sub-sea permafrost region contains approximately 30 % of the global carbon stock, and therefore understanding Arctic methane emissions and how they might change with a changing climate is important for quantifying the global methane budget and understanding its growth in the atmosphere. Here we present measurements from a new in situ flux observation system designed for use on a small, low-flying aircraft that was deployed over the North Slope of Alaska during August 2013. The system combines a small methane instrument based on integrated cavity output spectroscopy (ICOS) with an air turbulence probe to calculate methane fluxes based on eddy covariance. We group surface fluxes by land class using a map based on LandSat Thematic Mapper (TM) data with 30 m resolution. We find that wet sedge areas dominate the methane fluxes with a mean flux of 2.1 µg m−2 s−1 during the first part of August. Methane emissions from the Sagavanirktok River have the second highest at almost 1 µg m−2 s−1. During the second half of August, after soil temperatures had cooled by 7 °C, methane emissions fell to between 0 and 0.5 µg m−2 s−1 for all areas measured. We compare the aircraft measurements with an eddy covariance flux tower located in a wet sedge area and show that the two measurements agree quantitatively when the footprints of both overlap. However, fluxes from sedge vary at times by a factor of 2 or more even within a few kilometers of the tower demonstrating the importance of making regional measurements to map out methane emissions spatial heterogeneity. Aircraft measurements of surface flux can play an important role in bridging the gap between ground-based measurements and regional measurements from remote sensing instruments and models. Article in Journal/Newspaper arctic methane Arctic north slope permafrost Alaska Niedersächsisches Online-Archiv NOA Arctic Atmospheric Chemistry and Physics 17 13 8619 8633 |
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Niedersächsisches Online-Archiv NOA |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Sayres, David S. Dobosy, Ronald Healy, Claire Dumas, Edward Kochendorfer, John Munster, Jason Wilkerson, Jordan Baker, Bruce Anderson, James G. Arctic regional methane fluxes by ecotope as derived using eddy covariance from a low-flying aircraft |
topic_facet |
article Verlagsveröffentlichung |
description |
The Arctic terrestrial and sub-sea permafrost region contains approximately 30 % of the global carbon stock, and therefore understanding Arctic methane emissions and how they might change with a changing climate is important for quantifying the global methane budget and understanding its growth in the atmosphere. Here we present measurements from a new in situ flux observation system designed for use on a small, low-flying aircraft that was deployed over the North Slope of Alaska during August 2013. The system combines a small methane instrument based on integrated cavity output spectroscopy (ICOS) with an air turbulence probe to calculate methane fluxes based on eddy covariance. We group surface fluxes by land class using a map based on LandSat Thematic Mapper (TM) data with 30 m resolution. We find that wet sedge areas dominate the methane fluxes with a mean flux of 2.1 µg m−2 s−1 during the first part of August. Methane emissions from the Sagavanirktok River have the second highest at almost 1 µg m−2 s−1. During the second half of August, after soil temperatures had cooled by 7 °C, methane emissions fell to between 0 and 0.5 µg m−2 s−1 for all areas measured. We compare the aircraft measurements with an eddy covariance flux tower located in a wet sedge area and show that the two measurements agree quantitatively when the footprints of both overlap. However, fluxes from sedge vary at times by a factor of 2 or more even within a few kilometers of the tower demonstrating the importance of making regional measurements to map out methane emissions spatial heterogeneity. Aircraft measurements of surface flux can play an important role in bridging the gap between ground-based measurements and regional measurements from remote sensing instruments and models. |
format |
Article in Journal/Newspaper |
author |
Sayres, David S. Dobosy, Ronald Healy, Claire Dumas, Edward Kochendorfer, John Munster, Jason Wilkerson, Jordan Baker, Bruce Anderson, James G. |
author_facet |
Sayres, David S. Dobosy, Ronald Healy, Claire Dumas, Edward Kochendorfer, John Munster, Jason Wilkerson, Jordan Baker, Bruce Anderson, James G. |
author_sort |
Sayres, David S. |
title |
Arctic regional methane fluxes by ecotope as derived using eddy covariance from a low-flying aircraft |
title_short |
Arctic regional methane fluxes by ecotope as derived using eddy covariance from a low-flying aircraft |
title_full |
Arctic regional methane fluxes by ecotope as derived using eddy covariance from a low-flying aircraft |
title_fullStr |
Arctic regional methane fluxes by ecotope as derived using eddy covariance from a low-flying aircraft |
title_full_unstemmed |
Arctic regional methane fluxes by ecotope as derived using eddy covariance from a low-flying aircraft |
title_sort |
arctic regional methane fluxes by ecotope as derived using eddy covariance from a low-flying aircraft |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/acp-17-8619-2017 https://noa.gwlb.de/receive/cop_mods_00042326 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00041946/acp-17-8619-2017.pdf https://acp.copernicus.org/articles/17/8619/2017/acp-17-8619-2017.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
arctic methane Arctic north slope permafrost Alaska |
genre_facet |
arctic methane Arctic north slope permafrost Alaska |
op_relation |
Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-17-8619-2017 https://noa.gwlb.de/receive/cop_mods_00042326 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00041946/acp-17-8619-2017.pdf https://acp.copernicus.org/articles/17/8619/2017/acp-17-8619-2017.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-17-8619-2017 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
17 |
container_issue |
13 |
container_start_page |
8619 |
op_container_end_page |
8633 |
_version_ |
1766305321715761152 |