Inverse modeling of pan-Arctic methane emissions at high spatial resolution: what can we learn from assimilating satellite retrievals and using different process-based wetland and lake biogeochemical models?
Understanding methane emissions from the Arctic, a fast-warming carbon reservoir, is important for projecting future changes in the global methane cycle. Here we optimized methane emissions from north of 60° N (pan-Arctic) regions using a nested-grid high-resolution inverse model that assimilates bo...
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ftdoajarticles:oai:doaj.org/article:943f12cc305c452394a63e565eab4808 2023-05-15T14:31:46+02:00 Inverse modeling of pan-Arctic methane emissions at high spatial resolution: what can we learn from assimilating satellite retrievals and using different process-based wetland and lake biogeochemical models? Z. Tan Q. Zhuang D. K. Henze C. Frankenberg E. Dlugokencky C. Sweeney A. J. Turner M. Sasakawa T. Machida 2016-10-01T00:00:00Z https://doi.org/10.5194/acp-16-12649-2016 https://doaj.org/article/943f12cc305c452394a63e565eab4808 EN eng Copernicus Publications https://www.atmos-chem-phys.net/16/12649/2016/acp-16-12649-2016.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-16-12649-2016 1680-7316 1680-7324 https://doaj.org/article/943f12cc305c452394a63e565eab4808 Atmospheric Chemistry and Physics, Vol 16, Pp 12649-12666 (2016) Physics QC1-999 Chemistry QD1-999 article 2016 ftdoajarticles https://doi.org/10.5194/acp-16-12649-2016 2022-12-31T00:26:44Z Understanding methane emissions from the Arctic, a fast-warming carbon reservoir, is important for projecting future changes in the global methane cycle. Here we optimized methane emissions from north of 60° N (pan-Arctic) regions using a nested-grid high-resolution inverse model that assimilates both high-precision surface measurements and column-average SCanning Imaging Absorption spectroMeter for Atmospheric CHartogrphY (SCIAMACHY) satellite retrievals of methane mole fraction. For the first time, methane emissions from lakes were integrated into an atmospheric transport and inversion estimate, together with prior wetland emissions estimated with six biogeochemical models. In our estimates, in 2005, global methane emissions were in the range of 496.4–511.5 Tg yr −1 , and pan-Arctic methane emissions were in the range of 11.9–28.5 Tg yr −1 . Methane emissions from pan-Arctic wetlands and lakes were 5.5–14.2 and 2.4–14.2 Tg yr −1 , respectively. Methane emissions from Siberian wetlands and lakes are the largest and also have the largest uncertainty. Our results indicate that the uncertainty introduced by different wetland models could be much larger than the uncertainty of each inversion. We also show that assimilating satellite retrievals can reduce the uncertainty of the nested-grid inversions. The significance of lake emissions cannot be identified across the pan-Arctic by high-resolution inversions, but it is possible to identify high lake emissions from some specific regions. In contrast to global inversions, high-resolution nested-grid inversions perform better in estimating near-surface methane concentrations. Article in Journal/Newspaper arctic methane Arctic Directory of Open Access Journals: DOAJ Articles Arctic High Lake ENVELOPE(-110.849,-110.849,67.386,67.386) Atmospheric Chemistry and Physics 16 19 12649 12666 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 Z. Tan Q. Zhuang D. K. Henze C. Frankenberg E. Dlugokencky C. Sweeney A. J. Turner M. Sasakawa T. Machida Inverse modeling of pan-Arctic methane emissions at high spatial resolution: what can we learn from assimilating satellite retrievals and using different process-based wetland and lake biogeochemical models? |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
Understanding methane emissions from the Arctic, a fast-warming carbon reservoir, is important for projecting future changes in the global methane cycle. Here we optimized methane emissions from north of 60° N (pan-Arctic) regions using a nested-grid high-resolution inverse model that assimilates both high-precision surface measurements and column-average SCanning Imaging Absorption spectroMeter for Atmospheric CHartogrphY (SCIAMACHY) satellite retrievals of methane mole fraction. For the first time, methane emissions from lakes were integrated into an atmospheric transport and inversion estimate, together with prior wetland emissions estimated with six biogeochemical models. In our estimates, in 2005, global methane emissions were in the range of 496.4–511.5 Tg yr −1 , and pan-Arctic methane emissions were in the range of 11.9–28.5 Tg yr −1 . Methane emissions from pan-Arctic wetlands and lakes were 5.5–14.2 and 2.4–14.2 Tg yr −1 , respectively. Methane emissions from Siberian wetlands and lakes are the largest and also have the largest uncertainty. Our results indicate that the uncertainty introduced by different wetland models could be much larger than the uncertainty of each inversion. We also show that assimilating satellite retrievals can reduce the uncertainty of the nested-grid inversions. The significance of lake emissions cannot be identified across the pan-Arctic by high-resolution inversions, but it is possible to identify high lake emissions from some specific regions. In contrast to global inversions, high-resolution nested-grid inversions perform better in estimating near-surface methane concentrations. |
format |
Article in Journal/Newspaper |
author |
Z. Tan Q. Zhuang D. K. Henze C. Frankenberg E. Dlugokencky C. Sweeney A. J. Turner M. Sasakawa T. Machida |
author_facet |
Z. Tan Q. Zhuang D. K. Henze C. Frankenberg E. Dlugokencky C. Sweeney A. J. Turner M. Sasakawa T. Machida |
author_sort |
Z. Tan |
title |
Inverse modeling of pan-Arctic methane emissions at high spatial resolution: what can we learn from assimilating satellite retrievals and using different process-based wetland and lake biogeochemical models? |
title_short |
Inverse modeling of pan-Arctic methane emissions at high spatial resolution: what can we learn from assimilating satellite retrievals and using different process-based wetland and lake biogeochemical models? |
title_full |
Inverse modeling of pan-Arctic methane emissions at high spatial resolution: what can we learn from assimilating satellite retrievals and using different process-based wetland and lake biogeochemical models? |
title_fullStr |
Inverse modeling of pan-Arctic methane emissions at high spatial resolution: what can we learn from assimilating satellite retrievals and using different process-based wetland and lake biogeochemical models? |
title_full_unstemmed |
Inverse modeling of pan-Arctic methane emissions at high spatial resolution: what can we learn from assimilating satellite retrievals and using different process-based wetland and lake biogeochemical models? |
title_sort |
inverse modeling of pan-arctic methane emissions at high spatial resolution: what can we learn from assimilating satellite retrievals and using different process-based wetland and lake biogeochemical models? |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/acp-16-12649-2016 https://doaj.org/article/943f12cc305c452394a63e565eab4808 |
long_lat |
ENVELOPE(-110.849,-110.849,67.386,67.386) |
geographic |
Arctic High Lake |
geographic_facet |
Arctic High Lake |
genre |
arctic methane Arctic |
genre_facet |
arctic methane Arctic |
op_source |
Atmospheric Chemistry and Physics, Vol 16, Pp 12649-12666 (2016) |
op_relation |
https://www.atmos-chem-phys.net/16/12649/2016/acp-16-12649-2016.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-16-12649-2016 1680-7316 1680-7324 https://doaj.org/article/943f12cc305c452394a63e565eab4808 |
op_doi |
https://doi.org/10.5194/acp-16-12649-2016 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
16 |
container_issue |
19 |
container_start_page |
12649 |
op_container_end_page |
12666 |
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1766305305875972096 |