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Millennial soil retention of terrestrial organic matter deposited in the Bengal Fan
The abundance of organic carbon (OC) in vegetation and soils (~2,600 PgC) compared to carbon in the atmosphere (~830 PgC) highlights the importance of terrestrial OC in global carbon budgets. The residence time of OC in continental reservoirs, which sets the rates of carbon exchange between land and...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6086914/ https://www.ncbi.nlm.nih.gov/pubmed/30097644 http://dx.doi.org/10.1038/s41598-018-30091-8 |
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author | French, Katherine L. Hein, Christopher J. Haghipour, Negar Wacker, Lukas Kudrass, Hermann R. Eglinton, Timothy I. Galy, Valier |
author_facet | French, Katherine L. Hein, Christopher J. Haghipour, Negar Wacker, Lukas Kudrass, Hermann R. Eglinton, Timothy I. Galy, Valier |
author_sort | French, Katherine L. |
collection | PubMed |
description | The abundance of organic carbon (OC) in vegetation and soils (~2,600 PgC) compared to carbon in the atmosphere (~830 PgC) highlights the importance of terrestrial OC in global carbon budgets. The residence time of OC in continental reservoirs, which sets the rates of carbon exchange between land and atmosphere, represents a key uncertainty in global carbon cycle dynamics. Retention of terrestrial OC can also distort bulk OC- and biomarker-based paleorecords, yet continental storage timescales remain poorly quantified. Using “bomb” radiocarbon ((14)C) from thermonuclear weapons testing as a tracer, we model leaf-wax fatty acid and bulk OC (14)C signatures in a river-proximal marine sediment core from the Bay of Bengal in order to constrain OC storage timescales within the Ganges-Brahmaputra (G-B) watershed. Our model shows that 79–83% of the leaf-waxes in this core were stored in continental reservoirs for an average of 1,000–1,200 calendar years, while the remainder was stored for an average of 15 years. This age structure distorts high-resolution organic paleorecords across geologically rapid events, highlighting that compound-specific proxy approaches must consider storage timescales. Furthermore, these results show that future environmental change could destabilize large stores of old - yet reactive - OC currently stored in tropical basins. |
format | Online Article Text |
id | pubmed-6086914 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-60869142018-08-16 Millennial soil retention of terrestrial organic matter deposited in the Bengal Fan French, Katherine L. Hein, Christopher J. Haghipour, Negar Wacker, Lukas Kudrass, Hermann R. Eglinton, Timothy I. Galy, Valier Sci Rep Article The abundance of organic carbon (OC) in vegetation and soils (~2,600 PgC) compared to carbon in the atmosphere (~830 PgC) highlights the importance of terrestrial OC in global carbon budgets. The residence time of OC in continental reservoirs, which sets the rates of carbon exchange between land and atmosphere, represents a key uncertainty in global carbon cycle dynamics. Retention of terrestrial OC can also distort bulk OC- and biomarker-based paleorecords, yet continental storage timescales remain poorly quantified. Using “bomb” radiocarbon ((14)C) from thermonuclear weapons testing as a tracer, we model leaf-wax fatty acid and bulk OC (14)C signatures in a river-proximal marine sediment core from the Bay of Bengal in order to constrain OC storage timescales within the Ganges-Brahmaputra (G-B) watershed. Our model shows that 79–83% of the leaf-waxes in this core were stored in continental reservoirs for an average of 1,000–1,200 calendar years, while the remainder was stored for an average of 15 years. This age structure distorts high-resolution organic paleorecords across geologically rapid events, highlighting that compound-specific proxy approaches must consider storage timescales. Furthermore, these results show that future environmental change could destabilize large stores of old - yet reactive - OC currently stored in tropical basins. Nature Publishing Group UK 2018-08-10 /pmc/articles/PMC6086914/ /pubmed/30097644 http://dx.doi.org/10.1038/s41598-018-30091-8 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article French, Katherine L. Hein, Christopher J. Haghipour, Negar Wacker, Lukas Kudrass, Hermann R. Eglinton, Timothy I. Galy, Valier Millennial soil retention of terrestrial organic matter deposited in the Bengal Fan |
title | Millennial soil retention of terrestrial organic matter deposited in the Bengal Fan |
title_full | Millennial soil retention of terrestrial organic matter deposited in the Bengal Fan |
title_fullStr | Millennial soil retention of terrestrial organic matter deposited in the Bengal Fan |
title_full_unstemmed | Millennial soil retention of terrestrial organic matter deposited in the Bengal Fan |
title_short | Millennial soil retention of terrestrial organic matter deposited in the Bengal Fan |
title_sort | millennial soil retention of terrestrial organic matter deposited in the bengal fan |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6086914/ https://www.ncbi.nlm.nih.gov/pubmed/30097644 http://dx.doi.org/10.1038/s41598-018-30091-8 |
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