Methane transport mechanisms and isotopic fractionation in emergent macrophytes of an Alaskan tundra lake
The carbon isotopic composition of methane emitted by the Alaskan emergent aquatic plants Arctophila fulva, a tundra mid-lake macrophyte, and Carex rostrata, a tundra lake margin macrophyte, was −58.6 ± 0.5 (n=2) and −66.6±2.5 (n= 6) ‰ respectively. The methane emitted by these species was found to...
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AGU (American Geophysical Union)
1992
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ftoceanrep:oai:oceanrep.geomar.de:41723 2023-05-15T15:23:13+02:00 Methane transport mechanisms and isotopic fractionation in emergent macrophytes of an Alaskan tundra lake Chanton, Jeffrey P. Martens, Christopher S. Kelley, Cheryl A. Crill, Patrick M. Showers, William J. 1992 text https://oceanrep.geomar.de/id/eprint/41723/ https://oceanrep.geomar.de/id/eprint/41723/1/Chanton%281%29.pdf https://doi.org/10.1029/90JD01542 en eng AGU (American Geophysical Union) https://oceanrep.geomar.de/id/eprint/41723/1/Chanton%281%29.pdf Chanton, J. P., Martens, C. S., Kelley, C. A., Crill, P. M. and Showers, W. J. (1992) Methane transport mechanisms and isotopic fractionation in emergent macrophytes of an Alaskan tundra lake. Journal of Geophysical Research - Atmospheres, 97 (D15). pp. 16681-16688. DOI 10.1029/90JD01542 <https://doi.org/10.1029/90JD01542>. doi:10.1029/90JD01542 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 1992 ftoceanrep https://doi.org/10.1029/90JD01542 2023-04-07T15:38:09Z The carbon isotopic composition of methane emitted by the Alaskan emergent aquatic plants Arctophila fulva, a tundra mid-lake macrophyte, and Carex rostrata, a tundra lake margin macrophyte, was −58.6 ± 0.5 (n=2) and −66.6±2.5 (n= 6) ‰ respectively. The methane emitted by these species was found to be depleted in 13C by 12‰ and 18‰, relative to methane withdrawn from plant stems 1 to 2 cm below the waterline. As the macrophyte-mediated methane flux represented approximately 97% of the flux from these sites, these results suggest the more rapid transport of 12CH4 relative to 13CH4 through plants to the atmosphere. This preferential release of the light isotope of methane, possibly combined with CH4 oxidation, caused the buildup of the heavy isotope within plant stems. Plant stem methane concentrations ranged from 0.2 to 4.0% ( math formula, 1.4; standard deviation (sd), 0.9; n=28) in Arctophila, with an isotopic composition of −46.1±4.3 ‰ (n = 8). Carex stem methane concentrations were lower, ranging from 150 to 1200 ppm ( math formula, 500; standard deviation, 360; n = 8), with an isotopic composition of −48.3±1.4‰ (n=3). Comparisons of the observed isotopic fractionations with those predicted from gas phase effusion and diffusion coefficients suggest a combination of one or both of these gas transport mechanisms with bulk (non-fractionationating) flow. Article in Journal/Newspaper Arctophila fulva Tundra OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Journal of Geophysical Research 97 D15 16681 |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
The carbon isotopic composition of methane emitted by the Alaskan emergent aquatic plants Arctophila fulva, a tundra mid-lake macrophyte, and Carex rostrata, a tundra lake margin macrophyte, was −58.6 ± 0.5 (n=2) and −66.6±2.5 (n= 6) ‰ respectively. The methane emitted by these species was found to be depleted in 13C by 12‰ and 18‰, relative to methane withdrawn from plant stems 1 to 2 cm below the waterline. As the macrophyte-mediated methane flux represented approximately 97% of the flux from these sites, these results suggest the more rapid transport of 12CH4 relative to 13CH4 through plants to the atmosphere. This preferential release of the light isotope of methane, possibly combined with CH4 oxidation, caused the buildup of the heavy isotope within plant stems. Plant stem methane concentrations ranged from 0.2 to 4.0% ( math formula, 1.4; standard deviation (sd), 0.9; n=28) in Arctophila, with an isotopic composition of −46.1±4.3 ‰ (n = 8). Carex stem methane concentrations were lower, ranging from 150 to 1200 ppm ( math formula, 500; standard deviation, 360; n = 8), with an isotopic composition of −48.3±1.4‰ (n=3). Comparisons of the observed isotopic fractionations with those predicted from gas phase effusion and diffusion coefficients suggest a combination of one or both of these gas transport mechanisms with bulk (non-fractionationating) flow. |
format |
Article in Journal/Newspaper |
author |
Chanton, Jeffrey P. Martens, Christopher S. Kelley, Cheryl A. Crill, Patrick M. Showers, William J. |
spellingShingle |
Chanton, Jeffrey P. Martens, Christopher S. Kelley, Cheryl A. Crill, Patrick M. Showers, William J. Methane transport mechanisms and isotopic fractionation in emergent macrophytes of an Alaskan tundra lake |
author_facet |
Chanton, Jeffrey P. Martens, Christopher S. Kelley, Cheryl A. Crill, Patrick M. Showers, William J. |
author_sort |
Chanton, Jeffrey P. |
title |
Methane transport mechanisms and isotopic fractionation in emergent macrophytes of an Alaskan tundra lake |
title_short |
Methane transport mechanisms and isotopic fractionation in emergent macrophytes of an Alaskan tundra lake |
title_full |
Methane transport mechanisms and isotopic fractionation in emergent macrophytes of an Alaskan tundra lake |
title_fullStr |
Methane transport mechanisms and isotopic fractionation in emergent macrophytes of an Alaskan tundra lake |
title_full_unstemmed |
Methane transport mechanisms and isotopic fractionation in emergent macrophytes of an Alaskan tundra lake |
title_sort |
methane transport mechanisms and isotopic fractionation in emergent macrophytes of an alaskan tundra lake |
publisher |
AGU (American Geophysical Union) |
publishDate |
1992 |
url |
https://oceanrep.geomar.de/id/eprint/41723/ https://oceanrep.geomar.de/id/eprint/41723/1/Chanton%281%29.pdf https://doi.org/10.1029/90JD01542 |
genre |
Arctophila fulva Tundra |
genre_facet |
Arctophila fulva Tundra |
op_relation |
https://oceanrep.geomar.de/id/eprint/41723/1/Chanton%281%29.pdf Chanton, J. P., Martens, C. S., Kelley, C. A., Crill, P. M. and Showers, W. J. (1992) Methane transport mechanisms and isotopic fractionation in emergent macrophytes of an Alaskan tundra lake. Journal of Geophysical Research - Atmospheres, 97 (D15). pp. 16681-16688. DOI 10.1029/90JD01542 <https://doi.org/10.1029/90JD01542>. doi:10.1029/90JD01542 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1029/90JD01542 |
container_title |
Journal of Geophysical Research |
container_volume |
97 |
container_issue |
D15 |
container_start_page |
16681 |
_version_ |
1766353937229676544 |