The Ephemeral Signature Of Permafrost Carbon In An Arctic Fluvial Network
Arctic fluvial networks process, outgas, and transport significant quantities of terrestrial organic carbon (C), particularly dissolved organic carbon (DOC). The proportion of permafrost C in these fluxes, however, is poorly constrained. A primary obstacle to the quantification of permafrost-derived...
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ftfloridasu:oai:diginole.lib.fsu.edu:fsu_609519 2024-06-09T07:43:58+00:00 The Ephemeral Signature Of Permafrost Carbon In An Arctic Fluvial Network Drake, Travis W. (authoraut) Guillemette, Francois (authoraut) Hemingway, Jordon D. (authoraut) Chanton, Jeffery P. (authoraut) Podgorski, David C. (authoraut) Zimov, Nikita S. (authoraut) Spencer, Robert G. M. (authoraut) 2018-05-01 1 online resource computer https://diginole.lib.fsu.edu/islandora/object/fsu%3A609519/datastream/TN/view/Ephemeral%20Signature%20Of%20Permafrost%20Carbon%20In%20An%20Arctic%20Fluvial%20Network.jpg English eng eng Journal of Geophysical Research-Biogeosciences--2169-8953 fsu:609519 (IID) FSU_libsubv1_wos_000435264200003 (DOI) 10.1029/2017JG004311 https://diginole.lib.fsu.edu/islandora/object/fsu%3A609519/datastream/TN/view/Ephemeral%20Signature%20Of%20Permafrost%20Carbon%20In%20An%20Arctic%20Fluvial%20Network.jpg Text journal article 2018 ftfloridasu 2024-05-10T08:08:14Z Arctic fluvial networks process, outgas, and transport significant quantities of terrestrial organic carbon (C), particularly dissolved organic carbon (DOC). The proportion of permafrost C in these fluxes, however, is poorly constrained. A primary obstacle to the quantification of permafrost-derived DOC is that it is rapidly respired without leaving a unique tracer of its presence. In this study, we investigated the production of bacterial respiratory carbon dioxide (CO2; measured as dissolved inorganic carbon; DIC) during maximum late-summer thaw in sites spanning a fluvial network (Kolyma Basin, Siberia) to assess whether the biodegradation of permafrost DOC could be detected by the presence of a persistent aged (C-14-depleted) signature on the DIC pool. Using Keeling plot interpretation of DIC produced in bioincubations of river water, we show that bacteria respire varying sources of DOC moving downstream through the fluvial network. Respiration of permafrost (production of aged CO2) was only detected in heavily permafrost thaw influenced sites. In nonpermafrost thaw impacted sites, ambient DIC was modern (C-14-enriched), but rather than precluding the respiration of permafrost OC upstream, we suggest that C-14-depleted DIC is overwhelmed by modern DIC. Investigation of dissolved organic matter composition via Fourier transform ion cyclotron resonance mass spectrometry highlighted that elevated levels of aliphatic and nitrogen-containing compounds were associated with the production of aged DIC, providing molecular-level insight as to why permafrost-derived dissolved organic matter is rapidly respired. Overall, results from this study demonstrate the difficulty of tracing inputs of a highly reactive substrate to systems with diverse organic matter sources. Keywords: climate-change, vulnerability, dioxide, soils, dissolved organic-matter, chemical-composition, resolution mass data, inorganic carbon, river continuum, thaw Publication Note: The publisher’s version of record is available at ... Article in Journal/Newspaper Arctic Climate change permafrost Siberia Florida State University: DigiNole Commons Arctic Kolyma ENVELOPE(161.000,161.000,69.500,69.500) |
institution |
Open Polar |
collection |
Florida State University: DigiNole Commons |
op_collection_id |
ftfloridasu |
language |
English |
description |
Arctic fluvial networks process, outgas, and transport significant quantities of terrestrial organic carbon (C), particularly dissolved organic carbon (DOC). The proportion of permafrost C in these fluxes, however, is poorly constrained. A primary obstacle to the quantification of permafrost-derived DOC is that it is rapidly respired without leaving a unique tracer of its presence. In this study, we investigated the production of bacterial respiratory carbon dioxide (CO2; measured as dissolved inorganic carbon; DIC) during maximum late-summer thaw in sites spanning a fluvial network (Kolyma Basin, Siberia) to assess whether the biodegradation of permafrost DOC could be detected by the presence of a persistent aged (C-14-depleted) signature on the DIC pool. Using Keeling plot interpretation of DIC produced in bioincubations of river water, we show that bacteria respire varying sources of DOC moving downstream through the fluvial network. Respiration of permafrost (production of aged CO2) was only detected in heavily permafrost thaw influenced sites. In nonpermafrost thaw impacted sites, ambient DIC was modern (C-14-enriched), but rather than precluding the respiration of permafrost OC upstream, we suggest that C-14-depleted DIC is overwhelmed by modern DIC. Investigation of dissolved organic matter composition via Fourier transform ion cyclotron resonance mass spectrometry highlighted that elevated levels of aliphatic and nitrogen-containing compounds were associated with the production of aged DIC, providing molecular-level insight as to why permafrost-derived dissolved organic matter is rapidly respired. Overall, results from this study demonstrate the difficulty of tracing inputs of a highly reactive substrate to systems with diverse organic matter sources. Keywords: climate-change, vulnerability, dioxide, soils, dissolved organic-matter, chemical-composition, resolution mass data, inorganic carbon, river continuum, thaw Publication Note: The publisher’s version of record is available at ... |
author2 |
Drake, Travis W. (authoraut) Guillemette, Francois (authoraut) Hemingway, Jordon D. (authoraut) Chanton, Jeffery P. (authoraut) Podgorski, David C. (authoraut) Zimov, Nikita S. (authoraut) Spencer, Robert G. M. (authoraut) |
format |
Article in Journal/Newspaper |
title |
The Ephemeral Signature Of Permafrost Carbon In An Arctic Fluvial Network |
spellingShingle |
The Ephemeral Signature Of Permafrost Carbon In An Arctic Fluvial Network |
title_short |
The Ephemeral Signature Of Permafrost Carbon In An Arctic Fluvial Network |
title_full |
The Ephemeral Signature Of Permafrost Carbon In An Arctic Fluvial Network |
title_fullStr |
The Ephemeral Signature Of Permafrost Carbon In An Arctic Fluvial Network |
title_full_unstemmed |
The Ephemeral Signature Of Permafrost Carbon In An Arctic Fluvial Network |
title_sort |
ephemeral signature of permafrost carbon in an arctic fluvial network |
publishDate |
2018 |
url |
https://diginole.lib.fsu.edu/islandora/object/fsu%3A609519/datastream/TN/view/Ephemeral%20Signature%20Of%20Permafrost%20Carbon%20In%20An%20Arctic%20Fluvial%20Network.jpg |
long_lat |
ENVELOPE(161.000,161.000,69.500,69.500) |
geographic |
Arctic Kolyma |
geographic_facet |
Arctic Kolyma |
genre |
Arctic Climate change permafrost Siberia |
genre_facet |
Arctic Climate change permafrost Siberia |
op_relation |
Journal of Geophysical Research-Biogeosciences--2169-8953 fsu:609519 (IID) FSU_libsubv1_wos_000435264200003 (DOI) 10.1029/2017JG004311 https://diginole.lib.fsu.edu/islandora/object/fsu%3A609519/datastream/TN/view/Ephemeral%20Signature%20Of%20Permafrost%20Carbon%20In%20An%20Arctic%20Fluvial%20Network.jpg |
_version_ |
1801372782207959040 |