Lacustrine oxygen isotopes as tracers of past climate change in NW Europe
The Holocene, although generally considered climatically stable in northwest Europe, is interrupted by abrupt changes. This research investigates the magnitude, expression and driving mechanisms of abrupt climatic change from lacustrine oxygen isotope records over the Early and Late Holocene. This i...
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UCL (University College London)
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ftucl:oai:eprints.ucl.ac.uk.OAI2:10147426 2023-12-24T10:17:14+01:00 Lacustrine oxygen isotopes as tracers of past climate change in NW Europe Tindall, Joanna May 2022-04-28 text archive https://discovery.ucl.ac.uk/id/eprint/10147426/2/JoannaMayTindall_15118195_redacted_25April2022.pdf https://discovery.ucl.ac.uk/id/eprint/10147426/4/Appendices.zip https://discovery.ucl.ac.uk/id/eprint/10147426/ eng eng UCL (University College London) https://discovery.ucl.ac.uk/id/eprint/10147426/2/JoannaMayTindall_15118195_redacted_25April2022.pdf https://discovery.ucl.ac.uk/id/eprint/10147426/4/Appendices.zip https://discovery.ucl.ac.uk/id/eprint/10147426/ open Doctoral thesis, UCL (University College London). Thesis Doctoral 2022 ftucl 2023-11-27T13:07:32Z The Holocene, although generally considered climatically stable in northwest Europe, is interrupted by abrupt changes. This research investigates the magnitude, expression and driving mechanisms of abrupt climatic change from lacustrine oxygen isotope records over the Early and Late Holocene. This is important in developing our understanding of climatic changes under varying driving mechanisms, and their impacts, considering the current climate crisis. The oxygen and carbon isotope analyses for the study were undertaken on ostracods, which are small aquatic crustaceans that have shells of low-Mg calcite. Emphasis was placed on the oxygen-isotope records in this research, the carbon-isotope data were used to provide supporting information. The Late Holocene was investigated at two neighbouring, extant, lake sites in Hampshire. A monitoring study was undertaken at each lake to help understand present-day water isotope systematics, in order to support the palaeoenvironmental reconstruction. Comparison of the proxy records from both lakes indicated each of them recorded broadly similar signals, although with some differences attributed to lake-specific processes. An Early Holocene record was produced from Crudale Meadow, Orkney Mainland. This record depicts a negative oxygen-isotope excursion dating to ~ 9.7 ka, which matches the expression and magnitude of abrupt climatic events in other lake sites in the British Isles and the Greenland ice core stratigraphy. The timing of the earliest Holocene oxygen isotope decline at Crudale Meadow, suggests asynchronicity with records across northwest Europe. Output from an isotope-enabled General Circulation Model, iHadCM3, was used to calculate synthetic carbonate oxygen-isotope values that were compared to the lake-sediment isotope data from both time intervals. iHadCM3 produces good representations of proxy data in these periods. This historical iHadCM3 data highlight the role of the North Atlantic Oscillation (NAO) in driving isotopic change in the British Isles Doctoral or Postdoctoral Thesis Greenland Greenland ice core ice core North Atlantic North Atlantic oscillation University College London: UCL Discovery Greenland |
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University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
English |
description |
The Holocene, although generally considered climatically stable in northwest Europe, is interrupted by abrupt changes. This research investigates the magnitude, expression and driving mechanisms of abrupt climatic change from lacustrine oxygen isotope records over the Early and Late Holocene. This is important in developing our understanding of climatic changes under varying driving mechanisms, and their impacts, considering the current climate crisis. The oxygen and carbon isotope analyses for the study were undertaken on ostracods, which are small aquatic crustaceans that have shells of low-Mg calcite. Emphasis was placed on the oxygen-isotope records in this research, the carbon-isotope data were used to provide supporting information. The Late Holocene was investigated at two neighbouring, extant, lake sites in Hampshire. A monitoring study was undertaken at each lake to help understand present-day water isotope systematics, in order to support the palaeoenvironmental reconstruction. Comparison of the proxy records from both lakes indicated each of them recorded broadly similar signals, although with some differences attributed to lake-specific processes. An Early Holocene record was produced from Crudale Meadow, Orkney Mainland. This record depicts a negative oxygen-isotope excursion dating to ~ 9.7 ka, which matches the expression and magnitude of abrupt climatic events in other lake sites in the British Isles and the Greenland ice core stratigraphy. The timing of the earliest Holocene oxygen isotope decline at Crudale Meadow, suggests asynchronicity with records across northwest Europe. Output from an isotope-enabled General Circulation Model, iHadCM3, was used to calculate synthetic carbonate oxygen-isotope values that were compared to the lake-sediment isotope data from both time intervals. iHadCM3 produces good representations of proxy data in these periods. This historical iHadCM3 data highlight the role of the North Atlantic Oscillation (NAO) in driving isotopic change in the British Isles |
format |
Doctoral or Postdoctoral Thesis |
author |
Tindall, Joanna May |
spellingShingle |
Tindall, Joanna May Lacustrine oxygen isotopes as tracers of past climate change in NW Europe |
author_facet |
Tindall, Joanna May |
author_sort |
Tindall, Joanna May |
title |
Lacustrine oxygen isotopes as tracers of past climate change in NW Europe |
title_short |
Lacustrine oxygen isotopes as tracers of past climate change in NW Europe |
title_full |
Lacustrine oxygen isotopes as tracers of past climate change in NW Europe |
title_fullStr |
Lacustrine oxygen isotopes as tracers of past climate change in NW Europe |
title_full_unstemmed |
Lacustrine oxygen isotopes as tracers of past climate change in NW Europe |
title_sort |
lacustrine oxygen isotopes as tracers of past climate change in nw europe |
publisher |
UCL (University College London) |
publishDate |
2022 |
url |
https://discovery.ucl.ac.uk/id/eprint/10147426/2/JoannaMayTindall_15118195_redacted_25April2022.pdf https://discovery.ucl.ac.uk/id/eprint/10147426/4/Appendices.zip https://discovery.ucl.ac.uk/id/eprint/10147426/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice core ice core North Atlantic North Atlantic oscillation |
genre_facet |
Greenland Greenland ice core ice core North Atlantic North Atlantic oscillation |
op_source |
Doctoral thesis, UCL (University College London). |
op_relation |
https://discovery.ucl.ac.uk/id/eprint/10147426/2/JoannaMayTindall_15118195_redacted_25April2022.pdf https://discovery.ucl.ac.uk/id/eprint/10147426/4/Appendices.zip https://discovery.ucl.ac.uk/id/eprint/10147426/ |
op_rights |
open |
_version_ |
1786205210935296000 |