Peatland Heterogeneity Impacts on Regional Carbon Flux and Its Radiative Effect Within a Boreal Landscape
Peatlands, with high spatial variability in ecotypes and microforms, constitute a significant part of the boreal landscape and play an important role in the global carbon (C) cycle. However, the effects of this peatland heterogeneity within the boreal landscape are rarely quantified. Here, we use fi...
Published in: | Journal of Geophysical Research: Biogeosciences |
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Wiley
2022
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Online Access: | https://lup.lub.lu.se/record/dafb5236-7e81-489b-8eed-6f08a3a999fa https://doi.org/10.1029/2021JG006774 |
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ftulundlup:oai:lup.lub.lu.se:dafb5236-7e81-489b-8eed-6f08a3a999fa 2023-10-29T02:37:32+01:00 Peatland Heterogeneity Impacts on Regional Carbon Flux and Its Radiative Effect Within a Boreal Landscape Kou, Dan Virtanen, Tarmo Treat, Claire C. Tuovinen, Juha Pekka Räsänen, Aleksi Juutinen, Sari Mikola, Juha Aurela, Mika Heiskanen, Lauri Heikkilä, Maija Weckström, Jan Juselius, Teemu Piilo, Sanna R. Deng, Jia Zhang, Yu Chaudhary, Nitin Huang, Conghong Väliranta, Minna Biasi, Christina Liu, Xiangyu Guo, Mingyang Zhuang, Qianlai Korhola, Atte Shurpali, Narasinha J. 2022-09 https://lup.lub.lu.se/record/dafb5236-7e81-489b-8eed-6f08a3a999fa https://doi.org/10.1029/2021JG006774 eng eng Wiley https://lup.lub.lu.se/record/dafb5236-7e81-489b-8eed-6f08a3a999fa http://dx.doi.org/10.1029/2021JG006774 scopus:85139094462 Journal of Geophysical Research: Biogeosciences; 127(9), no e2021JG006774 (2022) ISSN: 2169-8953 Physical Geography boreal carbon heterogeneity landscape peatland radiative effect contributiontojournal/article info:eu-repo/semantics/article text 2022 ftulundlup https://doi.org/10.1029/2021JG006774 2023-10-04T22:29:05Z Peatlands, with high spatial variability in ecotypes and microforms, constitute a significant part of the boreal landscape and play an important role in the global carbon (C) cycle. However, the effects of this peatland heterogeneity within the boreal landscape are rarely quantified. Here, we use field-based measurements, high-resolution land cover classification, and biogeochemical and atmospheric models to estimate the atmosphere-ecosystem C fluxes and the corresponding radiative effect (RE) for a boreal landscape (Kaamanen) in northern Finland. Our result shows that the Kaamanen catchment currently functioned as a sink of carbon dioxide (CO2) and a source of methane (CH4). Peatlands (26% of the area) contributed 22% of the total CO2 uptake and 89% of CH4 emissions; forests (61%) accounted for 78% of CO2 uptake and offset 6% of CH4 emissions; water bodies (13%) offset 7% of CO2 uptake and contributed 11% of CH4 emissions. The heterogeneity of peatlands accounted for 11%, 88%, and 75% of the area-weighted variability (deviation from the area-weighted mean among different land cover types (LCTs) within the catchment) in CO2 flux, CH4 flux, and the combined RE of CO2 and CH4 exchanges over the 25-year time horizon, respectively. Aggregating peatland LCTs or misclassifying them as nonpeatland LCTs can significantly (p < 0.05) bias the regional CH4 exchange and RE estimates, while differentiating between drier noninundated and wetter inundated peatlands can effectively reduce the bias. Current land cover products lack such details in peatland heterogeneity, which would be needed to better constrain boreal C budgets and global C-climate feedbacks. Article in Journal/Newspaper Kaamanen Northern Finland Lund University Publications (LUP) Journal of Geophysical Research: Biogeosciences 127 9 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Physical Geography boreal carbon heterogeneity landscape peatland radiative effect |
spellingShingle |
Physical Geography boreal carbon heterogeneity landscape peatland radiative effect Kou, Dan Virtanen, Tarmo Treat, Claire C. Tuovinen, Juha Pekka Räsänen, Aleksi Juutinen, Sari Mikola, Juha Aurela, Mika Heiskanen, Lauri Heikkilä, Maija Weckström, Jan Juselius, Teemu Piilo, Sanna R. Deng, Jia Zhang, Yu Chaudhary, Nitin Huang, Conghong Väliranta, Minna Biasi, Christina Liu, Xiangyu Guo, Mingyang Zhuang, Qianlai Korhola, Atte Shurpali, Narasinha J. Peatland Heterogeneity Impacts on Regional Carbon Flux and Its Radiative Effect Within a Boreal Landscape |
topic_facet |
Physical Geography boreal carbon heterogeneity landscape peatland radiative effect |
description |
Peatlands, with high spatial variability in ecotypes and microforms, constitute a significant part of the boreal landscape and play an important role in the global carbon (C) cycle. However, the effects of this peatland heterogeneity within the boreal landscape are rarely quantified. Here, we use field-based measurements, high-resolution land cover classification, and biogeochemical and atmospheric models to estimate the atmosphere-ecosystem C fluxes and the corresponding radiative effect (RE) for a boreal landscape (Kaamanen) in northern Finland. Our result shows that the Kaamanen catchment currently functioned as a sink of carbon dioxide (CO2) and a source of methane (CH4). Peatlands (26% of the area) contributed 22% of the total CO2 uptake and 89% of CH4 emissions; forests (61%) accounted for 78% of CO2 uptake and offset 6% of CH4 emissions; water bodies (13%) offset 7% of CO2 uptake and contributed 11% of CH4 emissions. The heterogeneity of peatlands accounted for 11%, 88%, and 75% of the area-weighted variability (deviation from the area-weighted mean among different land cover types (LCTs) within the catchment) in CO2 flux, CH4 flux, and the combined RE of CO2 and CH4 exchanges over the 25-year time horizon, respectively. Aggregating peatland LCTs or misclassifying them as nonpeatland LCTs can significantly (p < 0.05) bias the regional CH4 exchange and RE estimates, while differentiating between drier noninundated and wetter inundated peatlands can effectively reduce the bias. Current land cover products lack such details in peatland heterogeneity, which would be needed to better constrain boreal C budgets and global C-climate feedbacks. |
format |
Article in Journal/Newspaper |
author |
Kou, Dan Virtanen, Tarmo Treat, Claire C. Tuovinen, Juha Pekka Räsänen, Aleksi Juutinen, Sari Mikola, Juha Aurela, Mika Heiskanen, Lauri Heikkilä, Maija Weckström, Jan Juselius, Teemu Piilo, Sanna R. Deng, Jia Zhang, Yu Chaudhary, Nitin Huang, Conghong Väliranta, Minna Biasi, Christina Liu, Xiangyu Guo, Mingyang Zhuang, Qianlai Korhola, Atte Shurpali, Narasinha J. |
author_facet |
Kou, Dan Virtanen, Tarmo Treat, Claire C. Tuovinen, Juha Pekka Räsänen, Aleksi Juutinen, Sari Mikola, Juha Aurela, Mika Heiskanen, Lauri Heikkilä, Maija Weckström, Jan Juselius, Teemu Piilo, Sanna R. Deng, Jia Zhang, Yu Chaudhary, Nitin Huang, Conghong Väliranta, Minna Biasi, Christina Liu, Xiangyu Guo, Mingyang Zhuang, Qianlai Korhola, Atte Shurpali, Narasinha J. |
author_sort |
Kou, Dan |
title |
Peatland Heterogeneity Impacts on Regional Carbon Flux and Its Radiative Effect Within a Boreal Landscape |
title_short |
Peatland Heterogeneity Impacts on Regional Carbon Flux and Its Radiative Effect Within a Boreal Landscape |
title_full |
Peatland Heterogeneity Impacts on Regional Carbon Flux and Its Radiative Effect Within a Boreal Landscape |
title_fullStr |
Peatland Heterogeneity Impacts on Regional Carbon Flux and Its Radiative Effect Within a Boreal Landscape |
title_full_unstemmed |
Peatland Heterogeneity Impacts on Regional Carbon Flux and Its Radiative Effect Within a Boreal Landscape |
title_sort |
peatland heterogeneity impacts on regional carbon flux and its radiative effect within a boreal landscape |
publisher |
Wiley |
publishDate |
2022 |
url |
https://lup.lub.lu.se/record/dafb5236-7e81-489b-8eed-6f08a3a999fa https://doi.org/10.1029/2021JG006774 |
genre |
Kaamanen Northern Finland |
genre_facet |
Kaamanen Northern Finland |
op_source |
Journal of Geophysical Research: Biogeosciences; 127(9), no e2021JG006774 (2022) ISSN: 2169-8953 |
op_relation |
https://lup.lub.lu.se/record/dafb5236-7e81-489b-8eed-6f08a3a999fa http://dx.doi.org/10.1029/2021JG006774 scopus:85139094462 |
op_doi |
https://doi.org/10.1029/2021JG006774 |
container_title |
Journal of Geophysical Research: Biogeosciences |
container_volume |
127 |
container_issue |
9 |
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1781062437837996032 |