Organic Matter Preservation and Sequestration through the Synergistic Ferric Carbon Shuttle
As one of the largest pools of carbon on the planet, organic matter (OM) in aquatic environments plays a major role in balancing the global cycles of carbon and oxygen. Continued sequestration of OM in sediments is required to maintain the Earth’s oxidizing atmosphere and the mechanisms responsible...
Main Author: | |
---|---|
Format: | Thesis |
Language: | English |
Published: |
2017
|
Subjects: | |
Online Access: | https://spectrum.library.concordia.ca/id/eprint/982963/ https://spectrum.library.concordia.ca/id/eprint/982963/1/Barber_PhD_F2017.pdf |
id |
ftconcordiauniv:oai:https://spectrum.library.concordia.ca:982963 |
---|---|
record_format |
openpolar |
spelling |
ftconcordiauniv:oai:https://spectrum.library.concordia.ca:982963 2023-05-15T17:52:01+02:00 Organic Matter Preservation and Sequestration through the Synergistic Ferric Carbon Shuttle Barber, Andrew 2017-08 text https://spectrum.library.concordia.ca/id/eprint/982963/ https://spectrum.library.concordia.ca/id/eprint/982963/1/Barber_PhD_F2017.pdf en eng https://spectrum.library.concordia.ca/id/eprint/982963/1/Barber_PhD_F2017.pdf Barber, Andrew (2017) Organic Matter Preservation and Sequestration through the Synergistic Ferric Carbon Shuttle. PhD thesis, Concordia University. term_access Thesis NonPeerReviewed 2017 ftconcordiauniv 2022-05-28T19:02:43Z As one of the largest pools of carbon on the planet, organic matter (OM) in aquatic environments plays a major role in balancing the global cycles of carbon and oxygen. Continued sequestration of OM in sediments is required to maintain the Earth’s oxidizing atmosphere and the mechanisms responsible for the preservation of OM in sediments are of the utmost importance for understanding and modelling the long-term repercussions of global climate change and ocean acidification. A common approach used to track OM in such environments involves stable carbon isotope analysis, exploiting the variability in 13C content of natural OM. For stable isotope analysis to be useful, the difference in carbon stable isotope content of the OM pools of interest must be larger than the sum of the analytical uncertainty and natural spread in 13C content. Here we present several examples where differences in 13C content of natural OM can be used to track the fate of OM, while also providing a more realistic representation of the analytical uncertainty associated to these measurements. In addition, carbon stable isotopes were used in a long-term incubation study aimed at following the incorporation of a 13C depleted dissolved algal OM tracer from solution into the sediment mineral matrix. The incorporation of this algal tracer was enhanced through interactions with redox sensitive iron oxides, especially when there is co-precipitation of iron alongside OM. The effect of iron oxide precipitation on the preservation of OM is clear, increasing the quantity of OM sequestered in sediments while also slowing its degradation. Combined with a series of C and Fe K-edge X-ray studies, we demonstrate the importance of inner-sphere covalent complexation for the sequestration of OM via interactions with reactive iron in a series of samples from around the globe including marine and lactustrine sediments with varying oxygen exposure regimes. These strong molecular interactions stabilize iron and OM, allowing for their persistence in sediments via a ... Thesis Ocean acidification Spectrum: Concordia University Research Repository (Montreal) |
institution |
Open Polar |
collection |
Spectrum: Concordia University Research Repository (Montreal) |
op_collection_id |
ftconcordiauniv |
language |
English |
description |
As one of the largest pools of carbon on the planet, organic matter (OM) in aquatic environments plays a major role in balancing the global cycles of carbon and oxygen. Continued sequestration of OM in sediments is required to maintain the Earth’s oxidizing atmosphere and the mechanisms responsible for the preservation of OM in sediments are of the utmost importance for understanding and modelling the long-term repercussions of global climate change and ocean acidification. A common approach used to track OM in such environments involves stable carbon isotope analysis, exploiting the variability in 13C content of natural OM. For stable isotope analysis to be useful, the difference in carbon stable isotope content of the OM pools of interest must be larger than the sum of the analytical uncertainty and natural spread in 13C content. Here we present several examples where differences in 13C content of natural OM can be used to track the fate of OM, while also providing a more realistic representation of the analytical uncertainty associated to these measurements. In addition, carbon stable isotopes were used in a long-term incubation study aimed at following the incorporation of a 13C depleted dissolved algal OM tracer from solution into the sediment mineral matrix. The incorporation of this algal tracer was enhanced through interactions with redox sensitive iron oxides, especially when there is co-precipitation of iron alongside OM. The effect of iron oxide precipitation on the preservation of OM is clear, increasing the quantity of OM sequestered in sediments while also slowing its degradation. Combined with a series of C and Fe K-edge X-ray studies, we demonstrate the importance of inner-sphere covalent complexation for the sequestration of OM via interactions with reactive iron in a series of samples from around the globe including marine and lactustrine sediments with varying oxygen exposure regimes. These strong molecular interactions stabilize iron and OM, allowing for their persistence in sediments via a ... |
format |
Thesis |
author |
Barber, Andrew |
spellingShingle |
Barber, Andrew Organic Matter Preservation and Sequestration through the Synergistic Ferric Carbon Shuttle |
author_facet |
Barber, Andrew |
author_sort |
Barber, Andrew |
title |
Organic Matter Preservation and Sequestration through the Synergistic Ferric Carbon Shuttle |
title_short |
Organic Matter Preservation and Sequestration through the Synergistic Ferric Carbon Shuttle |
title_full |
Organic Matter Preservation and Sequestration through the Synergistic Ferric Carbon Shuttle |
title_fullStr |
Organic Matter Preservation and Sequestration through the Synergistic Ferric Carbon Shuttle |
title_full_unstemmed |
Organic Matter Preservation and Sequestration through the Synergistic Ferric Carbon Shuttle |
title_sort |
organic matter preservation and sequestration through the synergistic ferric carbon shuttle |
publishDate |
2017 |
url |
https://spectrum.library.concordia.ca/id/eprint/982963/ https://spectrum.library.concordia.ca/id/eprint/982963/1/Barber_PhD_F2017.pdf |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
https://spectrum.library.concordia.ca/id/eprint/982963/1/Barber_PhD_F2017.pdf Barber, Andrew (2017) Organic Matter Preservation and Sequestration through the Synergistic Ferric Carbon Shuttle. PhD thesis, Concordia University. |
op_rights |
term_access |
_version_ |
1766159334145785856 |