CO2 and CH4 exchanges between moist moss tundra and atmosphere on Kapp Linné, Svalbard
We measured CO2 and CH4 fluxes using chambers and eddy covariance (only CO2) from a moist moss tundra in Svalbard. The average net ecosystem exchange (NEE) during the summer (9 June–31 August) was negative (sink), with −0.139 ± 0.032 µmol m−2 s−1 corresponding to −11.8 g C m−2 for the whole summer....
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2022
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ftsubgoettingen:oai:publications.goettingen-research-online.de:2/113295 2023-09-05T13:17:48+02:00 CO2 and CH4 exchanges between moist moss tundra and atmosphere on Kapp Linné, Svalbard Lindroth, Anders Pirk, Norbert Jónsdóttir, Ingibjörg S. Stiegler, Christian Klemedtsson, Leif Nilsson, Mats B. 2022 https://resolver.sub.uni-goettingen.de/purl?gro-2/113295 https://doi.org/10.5194/bg-19-3921-2022 en eng 10.5194/bg-19-3921-2022 1726-4189 Fakultät für Forstwissenschaften und Waldökologie Büsgen-Institut Abteilung Bioklimatologie https://resolver.sub.uni-goettingen.de/purl?gro-2/113295 doi:10.5194/bg-19-3921-2022 CC BY 4.0 journal_article original_ja yes published_version 2022 ftsubgoettingen https://doi.org/10.5194/bg-19-3921-2022 2023-08-20T22:16:34Z We measured CO2 and CH4 fluxes using chambers and eddy covariance (only CO2) from a moist moss tundra in Svalbard. The average net ecosystem exchange (NEE) during the summer (9 June–31 August) was negative (sink), with −0.139 ± 0.032 µmol m−2 s−1 corresponding to −11.8 g C m−2 for the whole summer. The cumulated NEE over the whole growing season (day no. 160 to 284) was −2.5 g C m−2. The CH4 flux during the summer period showed a large spatial and temporal variability. The mean value of all 214 samples was 0.000511 ± 0.000315 µmol m−2 s−1, which corresponds to a growing season estimate of 0.04 to 0.16 g CH4 m−2. Thus, we find that this moss tundra ecosystem is closely in balance with the atmosphere during the growing season when regarding exchanges of CO2 and CH4. The sink of CO2 and the source of CH4 are small in comparison with other tundra ecosystems in the high Arctic. Air temperature, soil moisture and the greenness index contributed significantly to explaining the variation in ecosystem respiration (Reco), while active layer depth, soil moisture and the greenness index were the variables that best explained CH4 emissions. An estimate of temperature sensitivity of Reco and gross primary productivity (GPP) showed that the sensitivity is slightly higher for GPP than for Reco in the interval 0–4.5 ∘C; thereafter, the difference is small up to about 6 ∘C and then begins to rise rapidly for Reco. The consequence of this, for a small increase in air temperature of 1∘ (all other variables assumed unchanged), was that the respiration increased more than photosynthesis turning the small sink into a small source (4.5 g C m−2) during the growing season. Thus, we cannot rule out that the reason why the moss tundra is close to balance today is an effect of the warming that has already taken place in Svalbard. Article in Journal/Newspaper Arctic Svalbard Tundra Georg-August-Universität Göttingen: GoeScholar Arctic Svalbard Kapp Linné ENVELOPE(13.621,13.621,78.063,78.063) Biogeosciences 19 16 3921 3934 |
institution |
Open Polar |
collection |
Georg-August-Universität Göttingen: GoeScholar |
op_collection_id |
ftsubgoettingen |
language |
English |
description |
We measured CO2 and CH4 fluxes using chambers and eddy covariance (only CO2) from a moist moss tundra in Svalbard. The average net ecosystem exchange (NEE) during the summer (9 June–31 August) was negative (sink), with −0.139 ± 0.032 µmol m−2 s−1 corresponding to −11.8 g C m−2 for the whole summer. The cumulated NEE over the whole growing season (day no. 160 to 284) was −2.5 g C m−2. The CH4 flux during the summer period showed a large spatial and temporal variability. The mean value of all 214 samples was 0.000511 ± 0.000315 µmol m−2 s−1, which corresponds to a growing season estimate of 0.04 to 0.16 g CH4 m−2. Thus, we find that this moss tundra ecosystem is closely in balance with the atmosphere during the growing season when regarding exchanges of CO2 and CH4. The sink of CO2 and the source of CH4 are small in comparison with other tundra ecosystems in the high Arctic. Air temperature, soil moisture and the greenness index contributed significantly to explaining the variation in ecosystem respiration (Reco), while active layer depth, soil moisture and the greenness index were the variables that best explained CH4 emissions. An estimate of temperature sensitivity of Reco and gross primary productivity (GPP) showed that the sensitivity is slightly higher for GPP than for Reco in the interval 0–4.5 ∘C; thereafter, the difference is small up to about 6 ∘C and then begins to rise rapidly for Reco. The consequence of this, for a small increase in air temperature of 1∘ (all other variables assumed unchanged), was that the respiration increased more than photosynthesis turning the small sink into a small source (4.5 g C m−2) during the growing season. Thus, we cannot rule out that the reason why the moss tundra is close to balance today is an effect of the warming that has already taken place in Svalbard. |
format |
Article in Journal/Newspaper |
author |
Lindroth, Anders Pirk, Norbert Jónsdóttir, Ingibjörg S. Stiegler, Christian Klemedtsson, Leif Nilsson, Mats B. |
spellingShingle |
Lindroth, Anders Pirk, Norbert Jónsdóttir, Ingibjörg S. Stiegler, Christian Klemedtsson, Leif Nilsson, Mats B. CO2 and CH4 exchanges between moist moss tundra and atmosphere on Kapp Linné, Svalbard |
author_facet |
Lindroth, Anders Pirk, Norbert Jónsdóttir, Ingibjörg S. Stiegler, Christian Klemedtsson, Leif Nilsson, Mats B. |
author_sort |
Lindroth, Anders |
title |
CO2 and CH4 exchanges between moist moss tundra and atmosphere on Kapp Linné, Svalbard |
title_short |
CO2 and CH4 exchanges between moist moss tundra and atmosphere on Kapp Linné, Svalbard |
title_full |
CO2 and CH4 exchanges between moist moss tundra and atmosphere on Kapp Linné, Svalbard |
title_fullStr |
CO2 and CH4 exchanges between moist moss tundra and atmosphere on Kapp Linné, Svalbard |
title_full_unstemmed |
CO2 and CH4 exchanges between moist moss tundra and atmosphere on Kapp Linné, Svalbard |
title_sort |
co2 and ch4 exchanges between moist moss tundra and atmosphere on kapp linné, svalbard |
publishDate |
2022 |
url |
https://resolver.sub.uni-goettingen.de/purl?gro-2/113295 https://doi.org/10.5194/bg-19-3921-2022 |
long_lat |
ENVELOPE(13.621,13.621,78.063,78.063) |
geographic |
Arctic Svalbard Kapp Linné |
geographic_facet |
Arctic Svalbard Kapp Linné |
genre |
Arctic Svalbard Tundra |
genre_facet |
Arctic Svalbard Tundra |
op_relation |
10.5194/bg-19-3921-2022 1726-4189 Fakultät für Forstwissenschaften und Waldökologie Büsgen-Institut Abteilung Bioklimatologie https://resolver.sub.uni-goettingen.de/purl?gro-2/113295 doi:10.5194/bg-19-3921-2022 |
op_rights |
CC BY 4.0 |
op_doi |
https://doi.org/10.5194/bg-19-3921-2022 |
container_title |
Biogeosciences |
container_volume |
19 |
container_issue |
16 |
container_start_page |
3921 |
op_container_end_page |
3934 |
_version_ |
1776198837244788736 |