Spatial scale-dependent land–atmospheric methane exchanges in the northern high latitudes from 1993 to 2004
Effects of various spatial scales of water table dynamics on land–atmospheric methane (CH 4 ) exchanges have not yet been assessed for large regions. Here we used a coupled hydrology–biogeochemistry model to quantify daily CH 4 exchanges over the pan-Arctic from 1993 to 2004 at two spatial scales of...
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ftdoajarticles:oai:doaj.org/article:fe66091100834393832fabac53a62b9c 2023-05-15T15:12:11+02:00 Spatial scale-dependent land–atmospheric methane exchanges in the northern high latitudes from 1993 to 2004 X. Zhu Q. Zhuang X. Lu L. Song 2014-04-01T00:00:00Z https://doi.org/10.5194/bg-11-1693-2014 https://doaj.org/article/fe66091100834393832fabac53a62b9c EN eng Copernicus Publications http://www.biogeosciences.net/11/1693/2014/bg-11-1693-2014.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-11-1693-2014 https://doaj.org/article/fe66091100834393832fabac53a62b9c Biogeosciences, Vol 11, Iss 7, Pp 1693-1704 (2014) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2014 ftdoajarticles https://doi.org/10.5194/bg-11-1693-2014 2022-12-31T14:03:01Z Effects of various spatial scales of water table dynamics on land–atmospheric methane (CH 4 ) exchanges have not yet been assessed for large regions. Here we used a coupled hydrology–biogeochemistry model to quantify daily CH 4 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 CH 4 emissions were examined with a TOPMODEL-based parameterization scheme for the northern high latitudes. We found that both WTD and CH 4 emissions are better simulated at a 5 km spatial resolution. By considering the spatial heterogeneity of WTD, net regional CH 4 emissions at a 5 km resolution are 38.1–55.4 Tg CH 4 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 CH 4 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 CH 4 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 CH 4 emissions. The spatial scale-dependent effects of WTD should be considered in future quantification of regional CH 4 emissions. Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Biogeosciences 11 7 1693 1704 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 X. Zhu Q. Zhuang X. Lu L. Song Spatial scale-dependent land–atmospheric methane exchanges in the northern high latitudes from 1993 to 2004 |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Effects of various spatial scales of water table dynamics on land–atmospheric methane (CH 4 ) exchanges have not yet been assessed for large regions. Here we used a coupled hydrology–biogeochemistry model to quantify daily CH 4 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 CH 4 emissions were examined with a TOPMODEL-based parameterization scheme for the northern high latitudes. We found that both WTD and CH 4 emissions are better simulated at a 5 km spatial resolution. By considering the spatial heterogeneity of WTD, net regional CH 4 emissions at a 5 km resolution are 38.1–55.4 Tg CH 4 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 CH 4 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 CH 4 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 CH 4 emissions. The spatial scale-dependent effects of WTD should be considered in future quantification of regional CH 4 emissions. |
format |
Article in Journal/Newspaper |
author |
X. Zhu Q. Zhuang X. Lu L. Song |
author_facet |
X. Zhu Q. Zhuang X. Lu L. Song |
author_sort |
X. Zhu |
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 |
publishDate |
2014 |
url |
https://doi.org/10.5194/bg-11-1693-2014 https://doaj.org/article/fe66091100834393832fabac53a62b9c |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Biogeosciences, Vol 11, Iss 7, Pp 1693-1704 (2014) |
op_relation |
http://www.biogeosciences.net/11/1693/2014/bg-11-1693-2014.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-11-1693-2014 https://doaj.org/article/fe66091100834393832fabac53a62b9c |
op_doi |
https://doi.org/10.5194/bg-11-1693-2014 |
container_title |
Biogeosciences |
container_volume |
11 |
container_issue |
7 |
container_start_page |
1693 |
op_container_end_page |
1704 |
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1766342899050479616 |