Increased North Atlantic dust deposition linked to Holocene Icelandic glacier fluctuations
Mineral dust concentrations are coupled to climate over glacialinterglacial cycles with increased dust deposition occurring during major cold phases over the last ~100 ka. Holocene records suggest considerable spatial and temporal variability in the magnitude, frequency and timing of dust peaks that...
Main Authors: | , , , , |
---|---|
Format: | Other Non-Article Part of Journal/Newspaper |
Language: | unknown |
Published: |
2022
|
Subjects: | |
Online Access: | https://figshare.com/articles/journal_contribution/Increased_North_Atlantic_dust_deposition_linked_to_Holocene_Icelandic_glacier_fluctuations/20936392 |
id |
ftloughboroughun:oai:figshare.com:article/20936392 |
---|---|
record_format |
openpolar |
spelling |
ftloughboroughun:oai:figshare.com:article/20936392 2023-05-15T16:21:48+02:00 Increased North Atlantic dust deposition linked to Holocene Icelandic glacier fluctuations Helena Stewart Tom Bradwell Joanna Bullard Robert D. McCulloch Ian Millar 2022-11-01T00:00:00Z https://figshare.com/articles/journal_contribution/Increased_North_Atlantic_dust_deposition_linked_to_Holocene_Icelandic_glacier_fluctuations/20936392 unknown 2134/20936392.v1 https://figshare.com/articles/journal_contribution/Increased_North_Atlantic_dust_deposition_linked_to_Holocene_Icelandic_glacier_fluctuations/20936392 CC BY 4.0 CC-BY Geology not elsewhere classified Archaeology not elsewhere classified Scotland Radiogenic isotopes Palaeoclimates Tephrochronology Peat archives Geology Archaeology Text Journal contribution 2022 ftloughboroughun 2023-02-02T00:08:04Z Mineral dust concentrations are coupled to climate over glacialinterglacial cycles with increased dust deposition occurring during major cold phases over the last ~100 ka. Holocene records suggest considerable spatial and temporal variability in the magnitude, frequency and timing of dust peaks that reflects regional or local drivers of dust emissions and transport. Here, we present stratigraphical, geochemical, and isotopic evidence for dust deposition from two high-resolution peat sequences 200 km apart in northern Scotland spanning the last c. 8200 years. εNd isotope data suggest the dominant minerogenic dust source switches between a low latitude (likely Saharan) and a high latitude, Icelandic source. Marked peaks in increased minerogenic dust deposition at: c. 5.4-5.1 ka BP, c. 4.0-3.9 ka BP, c. 2.8-2.6 ka BP, c. 1.0 ka BP and c. 0.3 ka BP occur against a backdrop of low dust deposition during the mid-Holocene (c. 5.0–4.0 ka BP) and increased background levels of dust during the neoglacial period (<4.0 ka BP). These dust peaks coincide with periods of glacial advance in Iceland and heightened storminess in the North Atlantic. Isotope data for additional dust peaks at c. 1.0 ka BP, c. 0.7 ka BP and the last ~50 years suggest these reflect increased dust from the Sahara associated with aridity and land-use change in North Africa during the late Holocene, and modern anthropogenic sources. This work highlights the complexity of Holocene records of dust deposition in the North Atlantic and emphasizes the role of dynamic sub-Polar glaciers and their meltwater systems as a significant dust source. Other Non-Article Part of Journal/Newspaper glacier Iceland North Atlantic Loughborough University: Figshare |
institution |
Open Polar |
collection |
Loughborough University: Figshare |
op_collection_id |
ftloughboroughun |
language |
unknown |
topic |
Geology not elsewhere classified Archaeology not elsewhere classified Scotland Radiogenic isotopes Palaeoclimates Tephrochronology Peat archives Geology Archaeology |
spellingShingle |
Geology not elsewhere classified Archaeology not elsewhere classified Scotland Radiogenic isotopes Palaeoclimates Tephrochronology Peat archives Geology Archaeology Helena Stewart Tom Bradwell Joanna Bullard Robert D. McCulloch Ian Millar Increased North Atlantic dust deposition linked to Holocene Icelandic glacier fluctuations |
topic_facet |
Geology not elsewhere classified Archaeology not elsewhere classified Scotland Radiogenic isotopes Palaeoclimates Tephrochronology Peat archives Geology Archaeology |
description |
Mineral dust concentrations are coupled to climate over glacialinterglacial cycles with increased dust deposition occurring during major cold phases over the last ~100 ka. Holocene records suggest considerable spatial and temporal variability in the magnitude, frequency and timing of dust peaks that reflects regional or local drivers of dust emissions and transport. Here, we present stratigraphical, geochemical, and isotopic evidence for dust deposition from two high-resolution peat sequences 200 km apart in northern Scotland spanning the last c. 8200 years. εNd isotope data suggest the dominant minerogenic dust source switches between a low latitude (likely Saharan) and a high latitude, Icelandic source. Marked peaks in increased minerogenic dust deposition at: c. 5.4-5.1 ka BP, c. 4.0-3.9 ka BP, c. 2.8-2.6 ka BP, c. 1.0 ka BP and c. 0.3 ka BP occur against a backdrop of low dust deposition during the mid-Holocene (c. 5.0–4.0 ka BP) and increased background levels of dust during the neoglacial period (<4.0 ka BP). These dust peaks coincide with periods of glacial advance in Iceland and heightened storminess in the North Atlantic. Isotope data for additional dust peaks at c. 1.0 ka BP, c. 0.7 ka BP and the last ~50 years suggest these reflect increased dust from the Sahara associated with aridity and land-use change in North Africa during the late Holocene, and modern anthropogenic sources. This work highlights the complexity of Holocene records of dust deposition in the North Atlantic and emphasizes the role of dynamic sub-Polar glaciers and their meltwater systems as a significant dust source. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
Helena Stewart Tom Bradwell Joanna Bullard Robert D. McCulloch Ian Millar |
author_facet |
Helena Stewart Tom Bradwell Joanna Bullard Robert D. McCulloch Ian Millar |
author_sort |
Helena Stewart |
title |
Increased North Atlantic dust deposition linked to Holocene Icelandic glacier fluctuations |
title_short |
Increased North Atlantic dust deposition linked to Holocene Icelandic glacier fluctuations |
title_full |
Increased North Atlantic dust deposition linked to Holocene Icelandic glacier fluctuations |
title_fullStr |
Increased North Atlantic dust deposition linked to Holocene Icelandic glacier fluctuations |
title_full_unstemmed |
Increased North Atlantic dust deposition linked to Holocene Icelandic glacier fluctuations |
title_sort |
increased north atlantic dust deposition linked to holocene icelandic glacier fluctuations |
publishDate |
2022 |
url |
https://figshare.com/articles/journal_contribution/Increased_North_Atlantic_dust_deposition_linked_to_Holocene_Icelandic_glacier_fluctuations/20936392 |
genre |
glacier Iceland North Atlantic |
genre_facet |
glacier Iceland North Atlantic |
op_relation |
2134/20936392.v1 https://figshare.com/articles/journal_contribution/Increased_North_Atlantic_dust_deposition_linked_to_Holocene_Icelandic_glacier_fluctuations/20936392 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
_version_ |
1766009789167435776 |