Spatial variability of tephra and carbon accumulation in a Holocene peatland
This research was undertaken while Elizabeth Watson was in possession of a NERC funded Doctoral Training Grant NE/K500847/1. Date of Acceptance: 25/07/2015 Microscopic tephra layers (‘cryptotephras’) represent important age-equivalent stratigraphic markers utilised in many palaeoenvironmental recons...
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ftstandrewserep:oai:research-repository.st-andrews.ac.uk:10023/7181 2023-07-02T03:32:30+02:00 Spatial variability of tephra and carbon accumulation in a Holocene peatland Watson, E.J. Swindles, G.T. Lawson, I.T. Savov, I.P. University of St Andrews. Geography & Sustainable Development University of St Andrews. Bell-Edwards Geographic Data Institute 2015-08-11T09:10:04Z 17 application/pdf http://hdl.handle.net/10023/7181 https://doi.org/10.1016/j.quascirev.2015.07.025 http://www.sciencedirect.com/science/article/pii/S0277379115300640#appd001 eng eng Quaternary Science Reviews Watson , E J , Swindles , G T , Lawson , I T & Savov , I P 2015 , ' Spatial variability of tephra and carbon accumulation in a Holocene peatland ' , Quaternary Science Reviews , vol. 124 , pp. 248-264 . https://doi.org/10.1016/j.quascirev.2015.07.025 0277-3791 PURE: 208918782 PURE UUID: f6b3f4f1-d3a2-4b92-b159-3ab4dcb92d81 RIS: urn:5A90185783C1FFA3487E6CCC28CD6B6E Scopus: 84939147666 WOS: 000361258000013 ORCID: /0000-0002-3547-2425/work/75996905 http://hdl.handle.net/10023/7181 https://doi.org/10.1016/j.quascirev.2015.07.025 http://www.sciencedirect.com/science/article/pii/S0277379115300640#appd001 © 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Tephrostratigraphy Volcanic ash Peatlands Geochronology Spheroidal carbonaceous particles Ireland GB Physical geography DAS GB Journal article 2015 ftstandrewserep https://doi.org/10.1016/j.quascirev.2015.07.025 2023-06-13T18:29:52Z This research was undertaken while Elizabeth Watson was in possession of a NERC funded Doctoral Training Grant NE/K500847/1. Date of Acceptance: 25/07/2015 Microscopic tephra layers (‘cryptotephras’) represent important age-equivalent stratigraphic markers utilised in many palaeoenvironmental reconstructions. When used in conjunction with proximal records of volcanic activity they can also provide information about volcanic ash cloud fallout and frequency. However, the spatial distributions of tephra layers can be discontinuous even within the same region. Understanding the deposition and post-depositional redistribution of tephra is vital if we are to use cryptotephras as records of ash cloud occurrence and chronostratigraphic markers. The discrete nature of tephra layers also allows for detailed study into processes of deposition and reworking which affect many palaeoenvironmental proxy records. We undertook a multi-core study in order to examine the historical tephrostratigraphy of a raised peatland in Northern Ireland. Three tephra layers originating from Iceland (Hekla 1947, Hekla 1845 and Hekla 1510) are present in 14 of the 15 cores analysed. This suggests that in areas not influenced by snowfall or anthropogenic disturbance at the time of tephra delivery, the presence or absence of a tephra layer is generally consistent across a peatland of this type. However, tephra shard counts (per unit area) vary by an order of magnitude between cores. These intra-site differences may confound the interpretation of shard counts from single cores as records of regional ash cloud mass/density. Bootstrap resampling analysis suggests that total shard counts from multiple cores are required in order to make a reliable estimate of median shard counts for a site. The presence of three historical tephras in 14 cores enables a spatio-temporal analysis of the long-term apparent rate of carbon accumulation (LARCA) in the peatland. Substantial spatial and temporal variations in LARCA are identified over the last ∼450 years. ... Article in Journal/Newspaper Hekla Iceland University of St Andrews: Digital Research Repository Quaternary Science Reviews 124 248 264 |
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Open Polar |
collection |
University of St Andrews: Digital Research Repository |
op_collection_id |
ftstandrewserep |
language |
English |
topic |
Tephrostratigraphy Volcanic ash Peatlands Geochronology Spheroidal carbonaceous particles Ireland GB Physical geography DAS GB |
spellingShingle |
Tephrostratigraphy Volcanic ash Peatlands Geochronology Spheroidal carbonaceous particles Ireland GB Physical geography DAS GB Watson, E.J. Swindles, G.T. Lawson, I.T. Savov, I.P. Spatial variability of tephra and carbon accumulation in a Holocene peatland |
topic_facet |
Tephrostratigraphy Volcanic ash Peatlands Geochronology Spheroidal carbonaceous particles Ireland GB Physical geography DAS GB |
description |
This research was undertaken while Elizabeth Watson was in possession of a NERC funded Doctoral Training Grant NE/K500847/1. Date of Acceptance: 25/07/2015 Microscopic tephra layers (‘cryptotephras’) represent important age-equivalent stratigraphic markers utilised in many palaeoenvironmental reconstructions. When used in conjunction with proximal records of volcanic activity they can also provide information about volcanic ash cloud fallout and frequency. However, the spatial distributions of tephra layers can be discontinuous even within the same region. Understanding the deposition and post-depositional redistribution of tephra is vital if we are to use cryptotephras as records of ash cloud occurrence and chronostratigraphic markers. The discrete nature of tephra layers also allows for detailed study into processes of deposition and reworking which affect many palaeoenvironmental proxy records. We undertook a multi-core study in order to examine the historical tephrostratigraphy of a raised peatland in Northern Ireland. Three tephra layers originating from Iceland (Hekla 1947, Hekla 1845 and Hekla 1510) are present in 14 of the 15 cores analysed. This suggests that in areas not influenced by snowfall or anthropogenic disturbance at the time of tephra delivery, the presence or absence of a tephra layer is generally consistent across a peatland of this type. However, tephra shard counts (per unit area) vary by an order of magnitude between cores. These intra-site differences may confound the interpretation of shard counts from single cores as records of regional ash cloud mass/density. Bootstrap resampling analysis suggests that total shard counts from multiple cores are required in order to make a reliable estimate of median shard counts for a site. The presence of three historical tephras in 14 cores enables a spatio-temporal analysis of the long-term apparent rate of carbon accumulation (LARCA) in the peatland. Substantial spatial and temporal variations in LARCA are identified over the last ∼450 years. ... |
author2 |
University of St Andrews. Geography & Sustainable Development University of St Andrews. Bell-Edwards Geographic Data Institute |
format |
Article in Journal/Newspaper |
author |
Watson, E.J. Swindles, G.T. Lawson, I.T. Savov, I.P. |
author_facet |
Watson, E.J. Swindles, G.T. Lawson, I.T. Savov, I.P. |
author_sort |
Watson, E.J. |
title |
Spatial variability of tephra and carbon accumulation in a Holocene peatland |
title_short |
Spatial variability of tephra and carbon accumulation in a Holocene peatland |
title_full |
Spatial variability of tephra and carbon accumulation in a Holocene peatland |
title_fullStr |
Spatial variability of tephra and carbon accumulation in a Holocene peatland |
title_full_unstemmed |
Spatial variability of tephra and carbon accumulation in a Holocene peatland |
title_sort |
spatial variability of tephra and carbon accumulation in a holocene peatland |
publishDate |
2015 |
url |
http://hdl.handle.net/10023/7181 https://doi.org/10.1016/j.quascirev.2015.07.025 http://www.sciencedirect.com/science/article/pii/S0277379115300640#appd001 |
genre |
Hekla Iceland |
genre_facet |
Hekla Iceland |
op_relation |
Quaternary Science Reviews Watson , E J , Swindles , G T , Lawson , I T & Savov , I P 2015 , ' Spatial variability of tephra and carbon accumulation in a Holocene peatland ' , Quaternary Science Reviews , vol. 124 , pp. 248-264 . https://doi.org/10.1016/j.quascirev.2015.07.025 0277-3791 PURE: 208918782 PURE UUID: f6b3f4f1-d3a2-4b92-b159-3ab4dcb92d81 RIS: urn:5A90185783C1FFA3487E6CCC28CD6B6E Scopus: 84939147666 WOS: 000361258000013 ORCID: /0000-0002-3547-2425/work/75996905 http://hdl.handle.net/10023/7181 https://doi.org/10.1016/j.quascirev.2015.07.025 http://www.sciencedirect.com/science/article/pii/S0277379115300640#appd001 |
op_rights |
© 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
op_doi |
https://doi.org/10.1016/j.quascirev.2015.07.025 |
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Quaternary Science Reviews |
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124 |
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248 |
op_container_end_page |
264 |
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1770272097271021568 |