Sedimentological storm and tsunami record of Loch Flugarth, Shetland Islands (UK)
This dataset comprises the geochemical and sedimentological results of both publications Hess et al., 2023 and Engel et al., 2023. Hess et al., 2023: Severe storm flooding poses a major hazard to the coasts of north-western Europe. However, the long-term recurrence patterns of extreme coastal floodi...
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ftunivhasselt:oai:documentserver.uhasselt.be:1942/41996 2024-02-04T10:02:27+01:00 Sedimentological storm and tsunami record of Loch Flugarth, Shetland Islands (UK) Hess, Katharina Engel, Max Koutsodendris, Andreas 2024-01-04T07:50:01Z http://hdl.handle.net/1942/41996 https://doi.org/10.11588/data/QJEZHT en eng heiDATA heiDATA. 10.11588/data/QJEZHT https://heidata.uni-heidelberg.de/citation?persistentId=doi:10.11588/data/QJEZHT http://hdl.handle.net/1942/41996 doi:10.11588/data/QJEZHT https://heidata.uni-heidelberg.de/citation?persistentId=doi:10.11588/data/QJEZHT info:eu-repo/semantics/closedAccess Creative Commons Attribution 4.0 International (CC-BY-4.0) Open Access Natural hazards Little Ice Age North Atlantic Oscillation (NAO) North Sea Sand overwash Storm frequency Tsunami deposit info:eu-repo/semantics/ 2024 ftunivhasselt https://doi.org/10.11588/data/QJEZHT 2024-01-10T23:23:18Z This dataset comprises the geochemical and sedimentological results of both publications Hess et al., 2023 and Engel et al., 2023. Hess et al., 2023: Severe storm flooding poses a major hazard to the coasts of north-western Europe. However, the long-term recurrence patterns of extreme coastal flooding and their governing factors are poorly understood. Therefore, high-resolution sedimentary records of past North Atlantic storm flooding are required. This multi-proxy study reconstructs storm-induced overwash processes from coastal lake sediments on the Shetland Islands using grain-size and geochemical data, and the re-analysis of historical data. The chronostratigraphy is based on Bayesian age–depth modelling using accelerator mass spectrometry 14C and 137Cs data. A high XRF-based Si/Ti ratio and the unimodal grain-size distribution link the sand layers to the beach and thus storm-induced overwash events. Periods with more frequent storm flooding occurred 980–1050, 1150–1300, 1450–1550, 1820–1900 and 1950–2000 ce, which is largely consistent with a positive North Atlantic Oscillation mode. The Little Ice Age (1400–1850 ce) shows a gap of major sand layers suggesting a southward shift of storm tracks and a seasonal variance with more storm floods in spring and autumn. Warmer phases shifted winter storm tracks towards the north-east Atlantic, indicating a possible trend for future storm-track changes and increased storm flooding in the northern North Sea region. Engel et al., 2023: Tsunami deposits around the North Sea basin are needed to assess the long-term hazard of tsunamis. Here, we present sedimentary evidence of the youngest tsunami on the Shetland Islands from Loch Flugarth, a coastal lake on northern Mainland. Three gravity cores show organic-rich background sedimentation with many sub-centimetre-scale sand layers, reflecting recurring storm overwash and a sediment source limited to the active beach and uppermost subtidal zone. A basal 13-cm-thick sand layer, dated to 426–787 cal. a CE based on 14C, 137Cs ... Other/Unknown Material North Atlantic North Atlantic oscillation North East Atlantic Document Server@UHasselt (Hasselt University) Hess ENVELOPE(-65.133,-65.133,-67.200,-67.200) |
institution |
Open Polar |
collection |
Document Server@UHasselt (Hasselt University) |
op_collection_id |
ftunivhasselt |
language |
English |
topic |
Natural hazards Little Ice Age North Atlantic Oscillation (NAO) North Sea Sand overwash Storm frequency Tsunami deposit |
spellingShingle |
Natural hazards Little Ice Age North Atlantic Oscillation (NAO) North Sea Sand overwash Storm frequency Tsunami deposit Sedimentological storm and tsunami record of Loch Flugarth, Shetland Islands (UK) |
topic_facet |
Natural hazards Little Ice Age North Atlantic Oscillation (NAO) North Sea Sand overwash Storm frequency Tsunami deposit |
description |
This dataset comprises the geochemical and sedimentological results of both publications Hess et al., 2023 and Engel et al., 2023. Hess et al., 2023: Severe storm flooding poses a major hazard to the coasts of north-western Europe. However, the long-term recurrence patterns of extreme coastal flooding and their governing factors are poorly understood. Therefore, high-resolution sedimentary records of past North Atlantic storm flooding are required. This multi-proxy study reconstructs storm-induced overwash processes from coastal lake sediments on the Shetland Islands using grain-size and geochemical data, and the re-analysis of historical data. The chronostratigraphy is based on Bayesian age–depth modelling using accelerator mass spectrometry 14C and 137Cs data. A high XRF-based Si/Ti ratio and the unimodal grain-size distribution link the sand layers to the beach and thus storm-induced overwash events. Periods with more frequent storm flooding occurred 980–1050, 1150–1300, 1450–1550, 1820–1900 and 1950–2000 ce, which is largely consistent with a positive North Atlantic Oscillation mode. The Little Ice Age (1400–1850 ce) shows a gap of major sand layers suggesting a southward shift of storm tracks and a seasonal variance with more storm floods in spring and autumn. Warmer phases shifted winter storm tracks towards the north-east Atlantic, indicating a possible trend for future storm-track changes and increased storm flooding in the northern North Sea region. Engel et al., 2023: Tsunami deposits around the North Sea basin are needed to assess the long-term hazard of tsunamis. Here, we present sedimentary evidence of the youngest tsunami on the Shetland Islands from Loch Flugarth, a coastal lake on northern Mainland. Three gravity cores show organic-rich background sedimentation with many sub-centimetre-scale sand layers, reflecting recurring storm overwash and a sediment source limited to the active beach and uppermost subtidal zone. A basal 13-cm-thick sand layer, dated to 426–787 cal. a CE based on 14C, 137Cs ... |
author2 |
Hess, Katharina Engel, Max Koutsodendris, Andreas |
format |
Other/Unknown Material |
title |
Sedimentological storm and tsunami record of Loch Flugarth, Shetland Islands (UK) |
title_short |
Sedimentological storm and tsunami record of Loch Flugarth, Shetland Islands (UK) |
title_full |
Sedimentological storm and tsunami record of Loch Flugarth, Shetland Islands (UK) |
title_fullStr |
Sedimentological storm and tsunami record of Loch Flugarth, Shetland Islands (UK) |
title_full_unstemmed |
Sedimentological storm and tsunami record of Loch Flugarth, Shetland Islands (UK) |
title_sort |
sedimentological storm and tsunami record of loch flugarth, shetland islands (uk) |
publisher |
heiDATA |
publishDate |
2024 |
url |
http://hdl.handle.net/1942/41996 https://doi.org/10.11588/data/QJEZHT |
long_lat |
ENVELOPE(-65.133,-65.133,-67.200,-67.200) |
geographic |
Hess |
geographic_facet |
Hess |
genre |
North Atlantic North Atlantic oscillation North East Atlantic |
genre_facet |
North Atlantic North Atlantic oscillation North East Atlantic |
op_relation |
heiDATA. 10.11588/data/QJEZHT https://heidata.uni-heidelberg.de/citation?persistentId=doi:10.11588/data/QJEZHT http://hdl.handle.net/1942/41996 doi:10.11588/data/QJEZHT https://heidata.uni-heidelberg.de/citation?persistentId=doi:10.11588/data/QJEZHT |
op_rights |
info:eu-repo/semantics/closedAccess Creative Commons Attribution 4.0 International (CC-BY-4.0) Open Access |
op_doi |
https://doi.org/10.11588/data/QJEZHT |
_version_ |
1789969140166950912 |