Spatial scale-dependent land–atmospheric methane exchanges in the northern high latitudes from 1993 to 2004
© The Author(s), 2014. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Biogeosciences 11 (2014): 1693-1704, doi:10.5194/bg-11-1693-2014. Effects of various spatial scales of water table dynamics on land–atmospheric meth...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/6683 2023-05-15T15:18:02+02:00 Spatial scale-dependent land–atmospheric methane exchanges in the northern high latitudes from 1993 to 2004 Zhu, Xudong Zhuang, Qianlai Lu, Xiaoliang Song, L. 2014-04-01 application/pdf https://hdl.handle.net/1912/6683 en_US eng Copernicus Publications on behalf of the European Geosciences Union https://doi.org/10.5194/bg-11-1693-2014 Biogeosciences 11 (2014): 1693-1704 https://hdl.handle.net/1912/6683 doi:10.5194/bg-11-1693-2014 Attribution 3.0 Unported http://creativecommons.org/licenses/by/3.0/ CC-BY Biogeosciences 11 (2014): 1693-1704 doi:10.5194/bg-11-1693-2014 Article 2014 ftwhoas https://doi.org/10.5194/bg-11-1693-2014 2022-05-28T22:59:07Z © The Author(s), 2014. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Biogeosciences 11 (2014): 1693-1704, doi:10.5194/bg-11-1693-2014. Effects of various spatial scales of water table dynamics on land–atmospheric methane (CH4) exchanges have not yet been assessed for large regions. Here we used a coupled hydrology–biogeochemistry model to quantify daily CH4 exchanges over the pan-Arctic from 1993 to 2004 at two spatial scales of 100 km and 5 km. The effects of sub-grid spatial variability of the water table depth (WTD) on CH4 emissions were examined with a TOPMODEL-based parameterization scheme for the northern high latitudes. We found that both WTD and CH4 emissions are better simulated at a 5 km spatial resolution. By considering the spatial heterogeneity of WTD, net regional CH4 emissions at a 5 km resolution are 38.1–55.4 Tg CH4 yr−1 from 1993 to 2004, which are on average 42% larger than those simulated at a 100 km resolution using a grid-cell-mean WTD scheme. The difference in annual CH4 emissions is attributed to the increased emitting area and enhanced flux density with finer resolution for WTD. Further, the inclusion of sub-grid WTD spatial heterogeneity also influences the inter-annual variability of CH4 emissions. Soil temperature plays an important role in the 100 km estimates, while the 5 km estimates are mainly influenced by WTD. This study suggests that previous macro-scale biogeochemical models using a grid-cell-mean WTD scheme might have underestimated the regional CH4 emissions. The spatial scale-dependent effects of WTD should be considered in future quantification of regional CH4 emissions. The research is funded by a DOE SciDAC project and an Abrupt Climate Change project. This study is also supported through projects funded by the NASA Land Use and Land Cover Change program (NASA-NNX09AI26G), Department of Energy (DE-FG02-08ER64599), the NSF Division of Information & Intelligent Systems (NSF-1028291), ... Article in Journal/Newspaper Arctic Climate change Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Arctic Biogeosciences 11 7 1693 1704 |
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Open Polar |
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Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
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English |
description |
© The Author(s), 2014. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Biogeosciences 11 (2014): 1693-1704, doi:10.5194/bg-11-1693-2014. Effects of various spatial scales of water table dynamics on land–atmospheric methane (CH4) exchanges have not yet been assessed for large regions. Here we used a coupled hydrology–biogeochemistry model to quantify daily CH4 exchanges over the pan-Arctic from 1993 to 2004 at two spatial scales of 100 km and 5 km. The effects of sub-grid spatial variability of the water table depth (WTD) on CH4 emissions were examined with a TOPMODEL-based parameterization scheme for the northern high latitudes. We found that both WTD and CH4 emissions are better simulated at a 5 km spatial resolution. By considering the spatial heterogeneity of WTD, net regional CH4 emissions at a 5 km resolution are 38.1–55.4 Tg CH4 yr−1 from 1993 to 2004, which are on average 42% larger than those simulated at a 100 km resolution using a grid-cell-mean WTD scheme. The difference in annual CH4 emissions is attributed to the increased emitting area and enhanced flux density with finer resolution for WTD. Further, the inclusion of sub-grid WTD spatial heterogeneity also influences the inter-annual variability of CH4 emissions. Soil temperature plays an important role in the 100 km estimates, while the 5 km estimates are mainly influenced by WTD. This study suggests that previous macro-scale biogeochemical models using a grid-cell-mean WTD scheme might have underestimated the regional CH4 emissions. The spatial scale-dependent effects of WTD should be considered in future quantification of regional CH4 emissions. The research is funded by a DOE SciDAC project and an Abrupt Climate Change project. This study is also supported through projects funded by the NASA Land Use and Land Cover Change program (NASA-NNX09AI26G), Department of Energy (DE-FG02-08ER64599), the NSF Division of Information & Intelligent Systems (NSF-1028291), ... |
format |
Article in Journal/Newspaper |
author |
Zhu, Xudong Zhuang, Qianlai Lu, Xiaoliang Song, L. |
spellingShingle |
Zhu, Xudong Zhuang, Qianlai Lu, Xiaoliang Song, L. Spatial scale-dependent land–atmospheric methane exchanges in the northern high latitudes from 1993 to 2004 |
author_facet |
Zhu, Xudong Zhuang, Qianlai Lu, Xiaoliang Song, L. |
author_sort |
Zhu, Xudong |
title |
Spatial scale-dependent land–atmospheric methane exchanges in the northern high latitudes from 1993 to 2004 |
title_short |
Spatial scale-dependent land–atmospheric methane exchanges in the northern high latitudes from 1993 to 2004 |
title_full |
Spatial scale-dependent land–atmospheric methane exchanges in the northern high latitudes from 1993 to 2004 |
title_fullStr |
Spatial scale-dependent land–atmospheric methane exchanges in the northern high latitudes from 1993 to 2004 |
title_full_unstemmed |
Spatial scale-dependent land–atmospheric methane exchanges in the northern high latitudes from 1993 to 2004 |
title_sort |
spatial scale-dependent land–atmospheric methane exchanges in the northern high latitudes from 1993 to 2004 |
publisher |
Copernicus Publications on behalf of the European Geosciences Union |
publishDate |
2014 |
url |
https://hdl.handle.net/1912/6683 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change |
genre_facet |
Arctic Climate change |
op_source |
Biogeosciences 11 (2014): 1693-1704 doi:10.5194/bg-11-1693-2014 |
op_relation |
https://doi.org/10.5194/bg-11-1693-2014 Biogeosciences 11 (2014): 1693-1704 https://hdl.handle.net/1912/6683 doi:10.5194/bg-11-1693-2014 |
op_rights |
Attribution 3.0 Unported http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/bg-11-1693-2014 |
container_title |
Biogeosciences |
container_volume |
11 |
container_issue |
7 |
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1693 |
op_container_end_page |
1704 |
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1766348274130747392 |