Variation in CO2 and CH4 fluxes among land cover types in heterogeneous Arctic tundra in northeastern Siberia
Arctic tundra is facing unprecedented warming, resulting in shifts in the vegetation, thaw regimes, and potentially in the ecosystem–atmosphere exchange of carbon (C). However, the estimates of regional carbon dioxide (CO 2 ) and methane (CH 4 ) budgets are highly uncertain. We measured CO 2 and CH...
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2022
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Online Access: | https://doi.org/10.5194/bg-19-3151-2022 https://bg.copernicus.org/articles/19/3151/2022/ |
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ftcopernicus:oai:publications.copernicus.org:bg100657 2023-05-15T15:03:52+02:00 Variation in CO2 and CH4 fluxes among land cover types in heterogeneous Arctic tundra in northeastern Siberia Juutinen, Sari Aurela, Mika Tuovinen, Juha-Pekka Ivakhov, Viktor Linkosalmi, Maiju Räsänen, Aleksi Virtanen, Tarmo Mikola, Juha Nyman, Johanna Vähä, Emmi Loskutova, Marina Makshtas, Alexander Laurila, Tuomas 2022-07-04 info:eu-repo/semantics/application/pdf https://doi.org/10.5194/bg-19-3151-2022 https://bg.copernicus.org/articles/19/3151/2022/ eng eng info:eu-repo/grantAgreement/EC/FP7/282700 doi:10.5194/bg-19-3151-2022 https://bg.copernicus.org/articles/19/3151/2022/ info:eu-repo/semantics/openAccess eISSN: 1726-4189 info:eu-repo/semantics/Text 2022 ftcopernicus https://doi.org/10.5194/bg-19-3151-2022 2022-07-11T16:22:43Z Arctic tundra is facing unprecedented warming, resulting in shifts in the vegetation, thaw regimes, and potentially in the ecosystem–atmosphere exchange of carbon (C). However, the estimates of regional carbon dioxide (CO 2 ) and methane (CH 4 ) budgets are highly uncertain. We measured CO 2 and CH 4 fluxes, vegetation composition and leaf area index (LAI), thaw depth, and soil wetness in Tiksi (71 ∘ N, 128 ∘ E), a heterogeneous site located within the prostrate dwarf-shrub tundra zone in northeastern Siberia. Using the closed chamber method, we determined the net ecosystem exchange (NEE) of CO 2 , ecosystem respiration in the dark (ER), ecosystem gross photosynthesis (Pg), and CH 4 flux during the growing season. We applied a previously developed high-spatial-resolution land cover map over an area of 35.8 km 2 for spatial extrapolation. Among the land cover types varying from barren to dwarf-shrub tundra and tundra wetlands, the NEE and Pg at the photosynthetically active photon flux density of 800 µ mol m −2 h −1 (NEE 800 and Pg 800 ) were greatest in the graminoid-dominated habitats, i.e., streamside meadow and fens, with NEE 800 and Pg 800 of up to − 21 (uptake) and 28 mmol m −2 h −1 , respectively. Vascular LAI was a robust predictor of both NEE 800 and Pg 800 and, on a landscape scale, the fens were disproportionately important for the summertime CO 2 sequestration. Dry tundra, including the dwarf-shrub and lichen tundra, had smaller CO 2 exchange rates. The fens were the largest source of CH 4 , while the dry mineral soil tundra consumed atmospheric CH 4 , which on a landscape scale amounted to − 9 % of the total CH 4 balance during the growing season. The largest seasonal mean CH 4 consumption rate of 0.02 mmol m −2 h −1 occurred in sand- and stone-covered barren areas. The high consumption rate agrees with the estimate based on the eddy covariance measurements at the same site. We acknowledge the uncertainty involved in spatial extrapolations due to a small number of replicates per land cover type. This ... Other/Unknown Material Arctic Tiksi Tundra Siberia Copernicus Publications: E-Journals Arctic Tiksi ENVELOPE(128.867,128.867,71.633,71.633) Biogeosciences 19 13 3151 3167 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Arctic tundra is facing unprecedented warming, resulting in shifts in the vegetation, thaw regimes, and potentially in the ecosystem–atmosphere exchange of carbon (C). However, the estimates of regional carbon dioxide (CO 2 ) and methane (CH 4 ) budgets are highly uncertain. We measured CO 2 and CH 4 fluxes, vegetation composition and leaf area index (LAI), thaw depth, and soil wetness in Tiksi (71 ∘ N, 128 ∘ E), a heterogeneous site located within the prostrate dwarf-shrub tundra zone in northeastern Siberia. Using the closed chamber method, we determined the net ecosystem exchange (NEE) of CO 2 , ecosystem respiration in the dark (ER), ecosystem gross photosynthesis (Pg), and CH 4 flux during the growing season. We applied a previously developed high-spatial-resolution land cover map over an area of 35.8 km 2 for spatial extrapolation. Among the land cover types varying from barren to dwarf-shrub tundra and tundra wetlands, the NEE and Pg at the photosynthetically active photon flux density of 800 µ mol m −2 h −1 (NEE 800 and Pg 800 ) were greatest in the graminoid-dominated habitats, i.e., streamside meadow and fens, with NEE 800 and Pg 800 of up to − 21 (uptake) and 28 mmol m −2 h −1 , respectively. Vascular LAI was a robust predictor of both NEE 800 and Pg 800 and, on a landscape scale, the fens were disproportionately important for the summertime CO 2 sequestration. Dry tundra, including the dwarf-shrub and lichen tundra, had smaller CO 2 exchange rates. The fens were the largest source of CH 4 , while the dry mineral soil tundra consumed atmospheric CH 4 , which on a landscape scale amounted to − 9 % of the total CH 4 balance during the growing season. The largest seasonal mean CH 4 consumption rate of 0.02 mmol m −2 h −1 occurred in sand- and stone-covered barren areas. The high consumption rate agrees with the estimate based on the eddy covariance measurements at the same site. We acknowledge the uncertainty involved in spatial extrapolations due to a small number of replicates per land cover type. This ... |
format |
Other/Unknown Material |
author |
Juutinen, Sari Aurela, Mika Tuovinen, Juha-Pekka Ivakhov, Viktor Linkosalmi, Maiju Räsänen, Aleksi Virtanen, Tarmo Mikola, Juha Nyman, Johanna Vähä, Emmi Loskutova, Marina Makshtas, Alexander Laurila, Tuomas |
spellingShingle |
Juutinen, Sari Aurela, Mika Tuovinen, Juha-Pekka Ivakhov, Viktor Linkosalmi, Maiju Räsänen, Aleksi Virtanen, Tarmo Mikola, Juha Nyman, Johanna Vähä, Emmi Loskutova, Marina Makshtas, Alexander Laurila, Tuomas Variation in CO2 and CH4 fluxes among land cover types in heterogeneous Arctic tundra in northeastern Siberia |
author_facet |
Juutinen, Sari Aurela, Mika Tuovinen, Juha-Pekka Ivakhov, Viktor Linkosalmi, Maiju Räsänen, Aleksi Virtanen, Tarmo Mikola, Juha Nyman, Johanna Vähä, Emmi Loskutova, Marina Makshtas, Alexander Laurila, Tuomas |
author_sort |
Juutinen, Sari |
title |
Variation in CO2 and CH4 fluxes among land cover types in heterogeneous Arctic tundra in northeastern Siberia |
title_short |
Variation in CO2 and CH4 fluxes among land cover types in heterogeneous Arctic tundra in northeastern Siberia |
title_full |
Variation in CO2 and CH4 fluxes among land cover types in heterogeneous Arctic tundra in northeastern Siberia |
title_fullStr |
Variation in CO2 and CH4 fluxes among land cover types in heterogeneous Arctic tundra in northeastern Siberia |
title_full_unstemmed |
Variation in CO2 and CH4 fluxes among land cover types in heterogeneous Arctic tundra in northeastern Siberia |
title_sort |
variation in co2 and ch4 fluxes among land cover types in heterogeneous arctic tundra in northeastern siberia |
publishDate |
2022 |
url |
https://doi.org/10.5194/bg-19-3151-2022 https://bg.copernicus.org/articles/19/3151/2022/ |
long_lat |
ENVELOPE(128.867,128.867,71.633,71.633) |
geographic |
Arctic Tiksi |
geographic_facet |
Arctic Tiksi |
genre |
Arctic Tiksi Tundra Siberia |
genre_facet |
Arctic Tiksi Tundra Siberia |
op_source |
eISSN: 1726-4189 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/282700 doi:10.5194/bg-19-3151-2022 https://bg.copernicus.org/articles/19/3151/2022/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-19-3151-2022 |
container_title |
Biogeosciences |
container_volume |
19 |
container_issue |
13 |
container_start_page |
3151 |
op_container_end_page |
3167 |
_version_ |
1766335703263739904 |