Radiocarbon measurements of ecosystem respiration and soil pore-space CO2 in Utqiaġvik (Barrow), Alaska
Radiocarbon measurements of ecosystem respiration and soil pore space CO2 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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Copernicus Publications
2018
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Online Access: | https://doi.org/10.5194/essd-10-1943-2018 https://www.earth-syst-sci-data.net/10/1943/2018/essd-10-1943-2018.pdf https://doaj.org/article/06ea8d3cd65e476f852921c9c9d230ae |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:06ea8d3cd65e476f852921c9c9d230ae 2023-05-15T15:15:46+02:00 Radiocarbon measurements of ecosystem respiration and soil pore-space CO2 in Utqiaġvik (Barrow), Alaska L. J. S. Vaughn M. S. Torn 2018-10-01 https://doi.org/10.5194/essd-10-1943-2018 https://www.earth-syst-sci-data.net/10/1943/2018/essd-10-1943-2018.pdf https://doaj.org/article/06ea8d3cd65e476f852921c9c9d230ae en eng Copernicus Publications doi:10.5194/essd-10-1943-2018 1866-3508 1866-3516 https://www.earth-syst-sci-data.net/10/1943/2018/essd-10-1943-2018.pdf https://doaj.org/article/06ea8d3cd65e476f852921c9c9d230ae undefined Earth System Science Data, Vol 10, Pp 1943-1957 (2018) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.5194/essd-10-1943-2018 2023-01-22T19:11:29Z Radiocarbon measurements of ecosystem respiration and soil pore space CO2 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 CO2 in Utqiaġvik (Barrow), Alaska, during the summers of 2012, 2013, and 2014. We found that radiocarbon in ecosystem respiration (Δ14CReco) 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 CO2 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 CO2 varied between −7.1 and −280 ‰, becoming more negative with depth in individual soil profiles. These pore-space radiocarbon values correspond to CO2 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 CO2 fluxes depended largely on autotrophic respiration and heterotrophic decomposition of fast-cycling carbon within the shallowest soil layers. The relative contributions of these different CO2 sources were highly variable across microtopographic features and time in the sampling season. The highly negative Δ14C values in soil pore-space CO2 and autumn ecosystem respiration indicate that when it is not frozen, very old soil carbon is vulnerable to decomposition. Radiocarbon data and associated CO2 flux and temperature data are stored in the data repository of the Next Generation Ecosystem Experiments (NGEE-Arctic) at http://dx.doi.org/10.5440/1364062 and https://doi.org/10.5440/1418853. Article in Journal/Newspaper Arctic Barrow permafrost Alaska Unknown Arctic Earth System Science Data 10 4 1943 1957 |
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English |
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envir geo |
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envir geo L. J. S. Vaughn M. S. Torn Radiocarbon measurements of ecosystem respiration and soil pore-space CO2 in Utqiaġvik (Barrow), Alaska |
topic_facet |
envir geo |
description |
Radiocarbon measurements of ecosystem respiration and soil pore space CO2 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 CO2 in Utqiaġvik (Barrow), Alaska, during the summers of 2012, 2013, and 2014. We found that radiocarbon in ecosystem respiration (Δ14CReco) 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 CO2 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 CO2 varied between −7.1 and −280 ‰, becoming more negative with depth in individual soil profiles. These pore-space radiocarbon values correspond to CO2 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 CO2 fluxes depended largely on autotrophic respiration and heterotrophic decomposition of fast-cycling carbon within the shallowest soil layers. The relative contributions of these different CO2 sources were highly variable across microtopographic features and time in the sampling season. The highly negative Δ14C values in soil pore-space CO2 and autumn ecosystem respiration indicate that when it is not frozen, very old soil carbon is vulnerable to decomposition. Radiocarbon data and associated CO2 flux and temperature data are stored in the data repository of the Next Generation Ecosystem Experiments (NGEE-Arctic) at http://dx.doi.org/10.5440/1364062 and https://doi.org/10.5440/1418853. |
format |
Article in Journal/Newspaper |
author |
L. J. S. Vaughn M. S. Torn |
author_facet |
L. J. S. Vaughn M. S. Torn |
author_sort |
L. J. S. Vaughn |
title |
Radiocarbon measurements of ecosystem respiration and soil pore-space CO2 in Utqiaġvik (Barrow), Alaska |
title_short |
Radiocarbon measurements of ecosystem respiration and soil pore-space CO2 in Utqiaġvik (Barrow), Alaska |
title_full |
Radiocarbon measurements of ecosystem respiration and soil pore-space CO2 in Utqiaġvik (Barrow), Alaska |
title_fullStr |
Radiocarbon measurements of ecosystem respiration and soil pore-space CO2 in Utqiaġvik (Barrow), Alaska |
title_full_unstemmed |
Radiocarbon measurements of ecosystem respiration and soil pore-space CO2 in Utqiaġvik (Barrow), Alaska |
title_sort |
radiocarbon measurements of ecosystem respiration and soil pore-space co2 in utqiaġvik (barrow), alaska |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/essd-10-1943-2018 https://www.earth-syst-sci-data.net/10/1943/2018/essd-10-1943-2018.pdf https://doaj.org/article/06ea8d3cd65e476f852921c9c9d230ae |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Barrow permafrost Alaska |
genre_facet |
Arctic Barrow permafrost Alaska |
op_source |
Earth System Science Data, Vol 10, Pp 1943-1957 (2018) |
op_relation |
doi:10.5194/essd-10-1943-2018 1866-3508 1866-3516 https://www.earth-syst-sci-data.net/10/1943/2018/essd-10-1943-2018.pdf https://doaj.org/article/06ea8d3cd65e476f852921c9c9d230ae |
op_rights |
undefined |
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_ |
1766346109733568512 |