Radiocarbon measurements of ecosystem respiration and soil pore-space CO 2 in Utqiagvik (Barrow), Alaska
Radiocarbon measurements of ecosystem respiration and soil pore space CO 2 are useful for determining the sources of ecosystem respiration,identifying environmental controls on soil carbon cycling rates, and parameterizing and evaluating models of the carbon cycle. We measured flux rates and radioca...
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Online Access: | http://www.osti.gov/servlets/purl/1563968 https://www.osti.gov/biblio/1563968 https://doi.org/10.5194/essd-10-1943-2018 |
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ftosti:oai:osti.gov:1563968 2023-07-30T04:02:36+02:00 Radiocarbon measurements of ecosystem respiration and soil pore-space CO 2 in Utqiagvik (Barrow), Alaska Vaughn, Lydia J. S. Torn, Margaret S. 2021-08-02 application/pdf http://www.osti.gov/servlets/purl/1563968 https://www.osti.gov/biblio/1563968 https://doi.org/10.5194/essd-10-1943-2018 unknown http://www.osti.gov/servlets/purl/1563968 https://www.osti.gov/biblio/1563968 https://doi.org/10.5194/essd-10-1943-2018 doi:10.5194/essd-10-1943-2018 54 ENVIRONMENTAL SCIENCES 2021 ftosti https://doi.org/10.5194/essd-10-1943-2018 2023-07-11T09:36:58Z Radiocarbon measurements of ecosystem respiration and soil pore space CO 2 are useful for determining the sources of ecosystem respiration,identifying environmental controls on soil carbon cycling rates, and parameterizing and evaluating models of the carbon cycle. We measured flux rates and radiocarbon content of ecosystem respiration, as well as radiocarbon in soil profile CO 2 in Utqiagvik (Barrow), Alaska, during the summers of 2012, 2013, and 2014.We found that radiocarbon in ecosystem respiration(Δ 14 C Reco ) ranged from +60.5 to –160‰ with a median value of +23.3‰. Ecosystem respiration became more depleted in radiocarbon from summer to autumn, indicating increased decomposition of old soil organic carbon and/or decreased CO 2 production from fast-cycling carbon pools. Across permafrost features,ecosystem respiration from high-centered polygons was depleted in radiocarbon relative to other polygon types. Radiocarbon content in soil pore-space CO 2 varied between –7.1 and –280‰, becoming more negative with depth in individual soil profiles. These pore-space radiocarbon values correspond to CO 2 mean ages of 410 to 3350 years, based on a steady-state, one-pool model. Together, these data indicate that deep soil respiration was derived primarily from old, slow-cycling carbon, but that total CO 2 fluxes depended largely on autotrophic respiration and heterotrophic decomposition of fast-cycling carbon within the shallowest soil layers. The relative contributions of these different CO 2 sources were highly variable across microtopographic features and time in the sampling season. The highly negative Δ 14 C values in soil pore-space CO 2 and autumn ecosystem respiration indicate that when it is not frozen, very old soil carbon is vulnerable to decomposition. Other/Unknown Material Barrow permafrost Alaska SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Earth System Science Data 10 4 1943 1957 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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ftosti |
language |
unknown |
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54 ENVIRONMENTAL SCIENCES |
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54 ENVIRONMENTAL SCIENCES Vaughn, Lydia J. S. Torn, Margaret S. Radiocarbon measurements of ecosystem respiration and soil pore-space CO 2 in Utqiagvik (Barrow), Alaska |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
Radiocarbon measurements of ecosystem respiration and soil pore space CO 2 are useful for determining the sources of ecosystem respiration,identifying environmental controls on soil carbon cycling rates, and parameterizing and evaluating models of the carbon cycle. We measured flux rates and radiocarbon content of ecosystem respiration, as well as radiocarbon in soil profile CO 2 in Utqiagvik (Barrow), Alaska, during the summers of 2012, 2013, and 2014.We found that radiocarbon in ecosystem respiration(Δ 14 C Reco ) ranged from +60.5 to –160‰ with a median value of +23.3‰. Ecosystem respiration became more depleted in radiocarbon from summer to autumn, indicating increased decomposition of old soil organic carbon and/or decreased CO 2 production from fast-cycling carbon pools. Across permafrost features,ecosystem respiration from high-centered polygons was depleted in radiocarbon relative to other polygon types. Radiocarbon content in soil pore-space CO 2 varied between –7.1 and –280‰, becoming more negative with depth in individual soil profiles. These pore-space radiocarbon values correspond to CO 2 mean ages of 410 to 3350 years, based on a steady-state, one-pool model. Together, these data indicate that deep soil respiration was derived primarily from old, slow-cycling carbon, but that total CO 2 fluxes depended largely on autotrophic respiration and heterotrophic decomposition of fast-cycling carbon within the shallowest soil layers. The relative contributions of these different CO 2 sources were highly variable across microtopographic features and time in the sampling season. The highly negative Δ 14 C values in soil pore-space CO 2 and autumn ecosystem respiration indicate that when it is not frozen, very old soil carbon is vulnerable to decomposition. |
author |
Vaughn, Lydia J. S. Torn, Margaret S. |
author_facet |
Vaughn, Lydia J. S. Torn, Margaret S. |
author_sort |
Vaughn, Lydia J. S. |
title |
Radiocarbon measurements of ecosystem respiration and soil pore-space CO 2 in Utqiagvik (Barrow), Alaska |
title_short |
Radiocarbon measurements of ecosystem respiration and soil pore-space CO 2 in Utqiagvik (Barrow), Alaska |
title_full |
Radiocarbon measurements of ecosystem respiration and soil pore-space CO 2 in Utqiagvik (Barrow), Alaska |
title_fullStr |
Radiocarbon measurements of ecosystem respiration and soil pore-space CO 2 in Utqiagvik (Barrow), Alaska |
title_full_unstemmed |
Radiocarbon measurements of ecosystem respiration and soil pore-space CO 2 in Utqiagvik (Barrow), Alaska |
title_sort |
radiocarbon measurements of ecosystem respiration and soil pore-space co 2 in utqiagvik (barrow), alaska |
publishDate |
2021 |
url |
http://www.osti.gov/servlets/purl/1563968 https://www.osti.gov/biblio/1563968 https://doi.org/10.5194/essd-10-1943-2018 |
genre |
Barrow permafrost Alaska |
genre_facet |
Barrow permafrost Alaska |
op_relation |
http://www.osti.gov/servlets/purl/1563968 https://www.osti.gov/biblio/1563968 https://doi.org/10.5194/essd-10-1943-2018 doi:10.5194/essd-10-1943-2018 |
op_doi |
https://doi.org/10.5194/essd-10-1943-2018 |
container_title |
Earth System Science Data |
container_volume |
10 |
container_issue |
4 |
container_start_page |
1943 |
op_container_end_page |
1957 |
_version_ |
1772813418917527552 |