Multi-proxy evidence of a mid-Holocene shift in the climatic system of Maritime Canada at ca. 6.8 ka BP
Persistent cyclical patterns of centennial- to millennial-scale changes in key climate drivers, such as North Atlantic Deep Water formation and the Atlantic Meridional Overturning Circulation, have frequently been identified in Holocene palaeorecords of the mid- and eastern-Atlantic region. Given it...
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ftsouthampton:oai:eprints.soton.ac.uk:363591 2023-07-30T04:04:15+02:00 Multi-proxy evidence of a mid-Holocene shift in the climatic system of Maritime Canada at ca. 6.8 ka BP Mallon, Gunnar Amesbury, Matthew Charman, Dan Hughes, Paul Loader, Neil Mauquoy, Dmitri Street-Perrott, Alayne Daley, Tim 2013-12 text https://eprints.soton.ac.uk/363591/ https://eprints.soton.ac.uk/363591/1/AGU%25202013%2520PRECIP%2520Abstract.pdf en English eng https://eprints.soton.ac.uk/363591/1/AGU%25202013%2520PRECIP%2520Abstract.pdf Mallon, Gunnar, Amesbury, Matthew, Charman, Dan, Hughes, Paul, Loader, Neil, Mauquoy, Dmitri, Street-Perrott, Alayne and Daley, Tim (2013) Multi-proxy evidence of a mid-Holocene shift in the climatic system of Maritime Canada at ca. 6.8 ka BP. AGU Fall Meeting, San Francisco, United States. 09 - 12 Dec 2013. pp. 1-2 . Conference or Workshop Item PeerReviewed 2013 ftsouthampton 2023-07-09T21:52:18Z Persistent cyclical patterns of centennial- to millennial-scale changes in key climate drivers, such as North Atlantic Deep Water formation and the Atlantic Meridional Overturning Circulation, have frequently been identified in Holocene palaeorecords of the mid- and eastern-Atlantic region. Given its proximity to the major discharge routes of the Laurentide Ice Sheet and repeated meltwater discharge of varying magnitude, the western Atlantic region, however, experienced disruptions to such cyclical climate patterns during the early Holocene. Here we present evidence of a shift in the climate system of Maritime Canada coinciding with the end of meltwater discharge at ca. 6.8 ka BP. Petite Bog (45°8'43"N, 63°56'36"W), a large ombrotrophic plateau bog in central Nova Scotia, was cored and analysed as part of the PRECIP (Palaeo- REconstructions of ocean-atmosphere Coupling In Peat) project, which aims to reconstruct the spatial-temporal pattern of moisture balance changes on the eastern seaboard of North America. A multi-proxy approach using stable isotope (C, H, and O) from Sphagnum cellulose, testate amoebae and plant macrofossil analysis was used to reconstruct palaeoclimatic changes at Petite Bog. Peat accumulation of ca. 1 yr.mm-1 was consistent and near-linear throughout most of the Holocene with the exception of a clear 1,400 year long slowing to ca. 10 yr.mm-1 following the ‘8.2 ka BP cold event’. A robust chronology, constrained by 34 14C radiocarbon dates, 3 typed tephra layers and an uncut surface, provides a suitable platform for palaeoclimatic reconstructions and multi-centennial to millennial-scale time series analysis. Results show a 325-year cyclicity in bog surface wetness (BSW), and consequently atmospheric moisture availability, following the mid-Holocene slow down in accumulation. This multi-centennial cycle is not present prior to ca. 6.8 ka BP, suggesting that the end of the meltwater influence marks a distinct shift in the regional climatic regime. Underlying the entire Holocene record is a ... Conference Object Ice Sheet North Atlantic Deep Water North Atlantic University of Southampton: e-Prints Soton Canada |
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Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
Persistent cyclical patterns of centennial- to millennial-scale changes in key climate drivers, such as North Atlantic Deep Water formation and the Atlantic Meridional Overturning Circulation, have frequently been identified in Holocene palaeorecords of the mid- and eastern-Atlantic region. Given its proximity to the major discharge routes of the Laurentide Ice Sheet and repeated meltwater discharge of varying magnitude, the western Atlantic region, however, experienced disruptions to such cyclical climate patterns during the early Holocene. Here we present evidence of a shift in the climate system of Maritime Canada coinciding with the end of meltwater discharge at ca. 6.8 ka BP. Petite Bog (45°8'43"N, 63°56'36"W), a large ombrotrophic plateau bog in central Nova Scotia, was cored and analysed as part of the PRECIP (Palaeo- REconstructions of ocean-atmosphere Coupling In Peat) project, which aims to reconstruct the spatial-temporal pattern of moisture balance changes on the eastern seaboard of North America. A multi-proxy approach using stable isotope (C, H, and O) from Sphagnum cellulose, testate amoebae and plant macrofossil analysis was used to reconstruct palaeoclimatic changes at Petite Bog. Peat accumulation of ca. 1 yr.mm-1 was consistent and near-linear throughout most of the Holocene with the exception of a clear 1,400 year long slowing to ca. 10 yr.mm-1 following the ‘8.2 ka BP cold event’. A robust chronology, constrained by 34 14C radiocarbon dates, 3 typed tephra layers and an uncut surface, provides a suitable platform for palaeoclimatic reconstructions and multi-centennial to millennial-scale time series analysis. Results show a 325-year cyclicity in bog surface wetness (BSW), and consequently atmospheric moisture availability, following the mid-Holocene slow down in accumulation. This multi-centennial cycle is not present prior to ca. 6.8 ka BP, suggesting that the end of the meltwater influence marks a distinct shift in the regional climatic regime. Underlying the entire Holocene record is a ... |
format |
Conference Object |
author |
Mallon, Gunnar Amesbury, Matthew Charman, Dan Hughes, Paul Loader, Neil Mauquoy, Dmitri Street-Perrott, Alayne Daley, Tim |
spellingShingle |
Mallon, Gunnar Amesbury, Matthew Charman, Dan Hughes, Paul Loader, Neil Mauquoy, Dmitri Street-Perrott, Alayne Daley, Tim Multi-proxy evidence of a mid-Holocene shift in the climatic system of Maritime Canada at ca. 6.8 ka BP |
author_facet |
Mallon, Gunnar Amesbury, Matthew Charman, Dan Hughes, Paul Loader, Neil Mauquoy, Dmitri Street-Perrott, Alayne Daley, Tim |
author_sort |
Mallon, Gunnar |
title |
Multi-proxy evidence of a mid-Holocene shift in the climatic system of Maritime Canada at ca. 6.8 ka BP |
title_short |
Multi-proxy evidence of a mid-Holocene shift in the climatic system of Maritime Canada at ca. 6.8 ka BP |
title_full |
Multi-proxy evidence of a mid-Holocene shift in the climatic system of Maritime Canada at ca. 6.8 ka BP |
title_fullStr |
Multi-proxy evidence of a mid-Holocene shift in the climatic system of Maritime Canada at ca. 6.8 ka BP |
title_full_unstemmed |
Multi-proxy evidence of a mid-Holocene shift in the climatic system of Maritime Canada at ca. 6.8 ka BP |
title_sort |
multi-proxy evidence of a mid-holocene shift in the climatic system of maritime canada at ca. 6.8 ka bp |
publishDate |
2013 |
url |
https://eprints.soton.ac.uk/363591/ https://eprints.soton.ac.uk/363591/1/AGU%25202013%2520PRECIP%2520Abstract.pdf |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Ice Sheet North Atlantic Deep Water North Atlantic |
genre_facet |
Ice Sheet North Atlantic Deep Water North Atlantic |
op_relation |
https://eprints.soton.ac.uk/363591/1/AGU%25202013%2520PRECIP%2520Abstract.pdf Mallon, Gunnar, Amesbury, Matthew, Charman, Dan, Hughes, Paul, Loader, Neil, Mauquoy, Dmitri, Street-Perrott, Alayne and Daley, Tim (2013) Multi-proxy evidence of a mid-Holocene shift in the climatic system of Maritime Canada at ca. 6.8 ka BP. AGU Fall Meeting, San Francisco, United States. 09 - 12 Dec 2013. pp. 1-2 . |
_version_ |
1772815521718206464 |