Volatile organic compound fluxes in a subarctic peatland and lake
Ecosystems exchange climate-relevant trace gases with the atmosphere, including volatile organic compounds (VOCs) that are a small but highly reactive part of the carbon cycle. VOCs have important ecological functions and implications for atmospheric chemistry and climate.We measured the ecosystem-level surface-atmosphere VOC fluxes using the eddy covariance technique at a shallow subarctic lake and an adjacent graminoid-dominated fen in northern Sweden during two contrasting periods: the peak growing season (mid-July) and the senescent period post-growing season (September-October). In July, the fen was a net source of methanol, acetaldehyde, acetone, dimethyl sulfide, isoprene, and monoterpenes. All of these VOCs showed a diel cycle of emission with maxima around noon and isoprene dominated the fluxes (93±22 μmolm-2 d-1, mean±SE). Isoprene emission was strongly stimulated by temperature and presented a steeper response to temperature (Q10 = 14:5) than that typically assumed in biogenic emission models, supporting the high temperature sensitivity of arctic vegetation. In September, net emissions of methanol and isoprene were drastically reduced, while acetaldehyde and acetone were deposited to the fen, with rates of up to-6:7±2:8 μmolm-2 d-1 for acetaldehyde. Remarkably, the lake was a sink for acetaldehyde and acetone during both periods, with average fluxes up to -19±1:3 μmolm-2 d-1 of acetone in July and up to-8:5± 2:3 μmolm-2 d-1 of acetaldehyde in September. The deposition of both carbonyl compounds correlated with their atmospheric mixing ratios, with deposition velocities of-0:23± 0:01 and-0:68±0:03 cm s-1 for acetone and acetaldehyde, respectively. Even though these VOC fluxes represented less than 0.5%and less than 5%of the CO2 and CH4 net carbon ecosystem exchange, respectively, VOCs alter the oxidation capacity of the atmosphere. Thus, understanding the response of their emissions to climate change is important for accurate prediction of the future climatic conditions in this rapidly warming area of the planet.
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European Geosciences Union
2020-11-11
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Subjects: | Volatile organic compounds (VOCs), Atmospheric chemistry, Gases, Climate, Take urgent action to combat climate change and its impacts, |
Online Access: | http://hdl.handle.net/10261/344967 http://dx.doi.org/10.13039/501100000780 https://api.elsevier.com/content/abstract/scopus_id/85096466976 |
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dig-idaea-es-10261-3449672024-05-14T21:02:53Z Volatile organic compound fluxes in a subarctic peatland and lake Seco, Roger Holst, Thomas Sillesen Matzen, Mikkel Westergaard-Nielsen, Andreas Li, Tao Simin, Tihomir Jansen, Joachim Crill, Patrick Friborg, Thomas Rinne, Janne Rinnan, Riikka European Commission Volatile organic compounds (VOCs) Atmospheric chemistry Gases Climate Take urgent action to combat climate change and its impacts Ecosystems exchange climate-relevant trace gases with the atmosphere, including volatile organic compounds (VOCs) that are a small but highly reactive part of the carbon cycle. VOCs have important ecological functions and implications for atmospheric chemistry and climate.We measured the ecosystem-level surface-atmosphere VOC fluxes using the eddy covariance technique at a shallow subarctic lake and an adjacent graminoid-dominated fen in northern Sweden during two contrasting periods: the peak growing season (mid-July) and the senescent period post-growing season (September-October). In July, the fen was a net source of methanol, acetaldehyde, acetone, dimethyl sulfide, isoprene, and monoterpenes. All of these VOCs showed a diel cycle of emission with maxima around noon and isoprene dominated the fluxes (93±22 μmolm-2 d-1, mean±SE). Isoprene emission was strongly stimulated by temperature and presented a steeper response to temperature (Q10 = 14:5) than that typically assumed in biogenic emission models, supporting the high temperature sensitivity of arctic vegetation. In September, net emissions of methanol and isoprene were drastically reduced, while acetaldehyde and acetone were deposited to the fen, with rates of up to-6:7±2:8 μmolm-2 d-1 for acetaldehyde. Remarkably, the lake was a sink for acetaldehyde and acetone during both periods, with average fluxes up to -19±1:3 μmolm-2 d-1 of acetone in July and up to-8:5± 2:3 μmolm-2 d-1 of acetaldehyde in September. The deposition of both carbonyl compounds correlated with their atmospheric mixing ratios, with deposition velocities of-0:23± 0:01 and-0:68±0:03 cm s-1 for acetone and acetaldehyde, respectively. Even though these VOC fluxes represented less than 0.5%and less than 5%of the CO2 and CH4 net carbon ecosystem exchange, respectively, VOCs alter the oxidation capacity of the atmosphere. Thus, understanding the response of their emissions to climate change is important for accurate prediction of the future climatic conditions in this rapidly warming area of the planet. This research has been supported by the European Research Council (TUVOLU – Tundra biogenic volatile emissions in the 21st century, grant no. 771012) and the Marie Skłodowska-Curie actions (HIVOL, grant no. 751684) under the European Union's Horizon 2020 research and innovation programme, the Independent Research Fund Denmark | Natural Sciences, the Swedish Research Council (grant no. 2013-5562), the European Commission under the Seventh Framework Programme (PAGE21, grant no. 282700), and by the Danish National Research Foundation (CENPERM DNRF100). Peer reviewed 2024-02-02T07:46:33Z 2024-02-02T07:46:33Z 2020-11-11 artículo http://purl.org/coar/resource_type/c_6501 Atmospheric Chemistry and Physics 20: 13399–13416 (2020) 16807316 http://hdl.handle.net/10261/344967 10.5194/acp-20-13399-2020 http://dx.doi.org/10.13039/501100000780 2-s2.0-85096466976 https://api.elsevier.com/content/abstract/scopus_id/85096466976 en #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/EC/FP7/282700 Atmospheric Chemistry and Physics Publisher's version https://doi.org/10.5194/acp-20-13399-2020 Sí open European Geosciences Union |
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Volatile organic compounds (VOCs) Atmospheric chemistry Gases Climate Take urgent action to combat climate change and its impacts Volatile organic compounds (VOCs) Atmospheric chemistry Gases Climate Take urgent action to combat climate change and its impacts |
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Volatile organic compounds (VOCs) Atmospheric chemistry Gases Climate Take urgent action to combat climate change and its impacts Volatile organic compounds (VOCs) Atmospheric chemistry Gases Climate Take urgent action to combat climate change and its impacts Seco, Roger Holst, Thomas Sillesen Matzen, Mikkel Westergaard-Nielsen, Andreas Li, Tao Simin, Tihomir Jansen, Joachim Crill, Patrick Friborg, Thomas Rinne, Janne Rinnan, Riikka Volatile organic compound fluxes in a subarctic peatland and lake |
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Ecosystems exchange climate-relevant trace gases with the atmosphere, including volatile organic compounds (VOCs) that are a small but highly reactive part of the carbon cycle. VOCs have important ecological functions and implications for atmospheric chemistry and climate.We measured the ecosystem-level surface-atmosphere VOC fluxes using the eddy covariance technique at a shallow subarctic lake and an adjacent graminoid-dominated fen in northern Sweden during two contrasting periods: the peak growing season (mid-July) and the senescent period post-growing season (September-October). In July, the fen was a net source of methanol, acetaldehyde, acetone, dimethyl sulfide, isoprene, and monoterpenes. All of these VOCs showed a diel cycle of emission with maxima around noon and isoprene dominated the fluxes (93±22 μmolm-2 d-1, mean±SE). Isoprene emission was strongly stimulated by temperature and presented a steeper response to temperature (Q10 = 14:5) than that typically assumed in biogenic emission models, supporting the high temperature sensitivity of arctic vegetation. In September, net emissions of methanol and isoprene were drastically reduced, while acetaldehyde and acetone were deposited to the fen, with rates of up to-6:7±2:8 μmolm-2 d-1 for acetaldehyde. Remarkably, the lake was a sink for acetaldehyde and acetone during both periods, with average fluxes up to -19±1:3 μmolm-2 d-1 of acetone in July and up to-8:5± 2:3 μmolm-2 d-1 of acetaldehyde in September. The deposition of both carbonyl compounds correlated with their atmospheric mixing ratios, with deposition velocities of-0:23± 0:01 and-0:68±0:03 cm s-1 for acetone and acetaldehyde, respectively. Even though these VOC fluxes represented less than 0.5%and less than 5%of the CO2 and CH4 net carbon ecosystem exchange, respectively, VOCs alter the oxidation capacity of the atmosphere. Thus, understanding the response of their emissions to climate change is important for accurate prediction of the future climatic conditions in this rapidly warming area of the planet. |
author2 |
European Commission |
author_facet |
European Commission Seco, Roger Holst, Thomas Sillesen Matzen, Mikkel Westergaard-Nielsen, Andreas Li, Tao Simin, Tihomir Jansen, Joachim Crill, Patrick Friborg, Thomas Rinne, Janne Rinnan, Riikka |
format |
artículo |
topic_facet |
Volatile organic compounds (VOCs) Atmospheric chemistry Gases Climate Take urgent action to combat climate change and its impacts |
author |
Seco, Roger Holst, Thomas Sillesen Matzen, Mikkel Westergaard-Nielsen, Andreas Li, Tao Simin, Tihomir Jansen, Joachim Crill, Patrick Friborg, Thomas Rinne, Janne Rinnan, Riikka |
author_sort |
Seco, Roger |
title |
Volatile organic compound fluxes in a subarctic peatland and lake |
title_short |
Volatile organic compound fluxes in a subarctic peatland and lake |
title_full |
Volatile organic compound fluxes in a subarctic peatland and lake |
title_fullStr |
Volatile organic compound fluxes in a subarctic peatland and lake |
title_full_unstemmed |
Volatile organic compound fluxes in a subarctic peatland and lake |
title_sort |
volatile organic compound fluxes in a subarctic peatland and lake |
publisher |
European Geosciences Union |
publishDate |
2020-11-11 |
url |
http://hdl.handle.net/10261/344967 http://dx.doi.org/10.13039/501100000780 https://api.elsevier.com/content/abstract/scopus_id/85096466976 |
work_keys_str_mv |
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