Assessing the statistical uniqueness of the Younger Dryas: a robust multivariate analysis
During the last glacial period (ca. 120–11 kyr BP), dramatic temperature swings, known as Dansgaard–Oeschger (D–O) events, are clearly manifest in high-resolution oxygen isotope records from the Greenland Ice Sheet. Although variability in the Atlantic Meridional Overturning Circulation (AMOC) is of...
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ftcopernicus:oai:publications.copernicus.org:cp84534 2023-05-15T16:28:00+02:00 Assessing the statistical uniqueness of the Younger Dryas: a robust multivariate analysis Nye, Henry Condron, Alan 2021-06-30 application/pdf https://doi.org/10.5194/cp-17-1409-2021 https://cp.copernicus.org/articles/17/1409/2021/ eng eng doi:10.5194/cp-17-1409-2021 https://cp.copernicus.org/articles/17/1409/2021/ eISSN: 1814-9332 Text 2021 ftcopernicus https://doi.org/10.5194/cp-17-1409-2021 2021-07-05T16:22:15Z During the last glacial period (ca. 120–11 kyr BP), dramatic temperature swings, known as Dansgaard–Oeschger (D–O) events, are clearly manifest in high-resolution oxygen isotope records from the Greenland Ice Sheet. Although variability in the Atlantic Meridional Overturning Circulation (AMOC) is often invoked, a unified explanation for what caused these “sawtooth-shaped” climate patterns has yet to be accepted. Of particular interest is the most recent D–O-shaped climate pattern that occurred from ∼ 14 600 to 11 500 years ago – the Bølling–Allerød (BA) warm interstadial and the subsequent Younger Dryas (YD) cold stadial. Unlike earlier D–O stadials, the YD is frequently considered a unique event, potentially resulting from a rerouting and/or flood of glacial meltwater into the North Atlantic or a meteorite impact. Yet, these mechanisms are less frequently considered as the cause of the earlier stadials. Using a robust multivariate outlier detection scheme – a novel approach for traditional paleoclimate research – we show that the pattern of climate change during the BA/YD is not statistically different from the other D–O events in the Greenland record and that it should not necessarily be considered unique when investigating the drivers of abrupt climate change. In so doing, our results present a novel statistical framework for paleoclimatic data analysis. Text Greenland Ice Sheet North Atlantic Copernicus Publications: E-Journals Greenland Climate of the Past 17 3 1409 1421 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
During the last glacial period (ca. 120–11 kyr BP), dramatic temperature swings, known as Dansgaard–Oeschger (D–O) events, are clearly manifest in high-resolution oxygen isotope records from the Greenland Ice Sheet. Although variability in the Atlantic Meridional Overturning Circulation (AMOC) is often invoked, a unified explanation for what caused these “sawtooth-shaped” climate patterns has yet to be accepted. Of particular interest is the most recent D–O-shaped climate pattern that occurred from ∼ 14 600 to 11 500 years ago – the Bølling–Allerød (BA) warm interstadial and the subsequent Younger Dryas (YD) cold stadial. Unlike earlier D–O stadials, the YD is frequently considered a unique event, potentially resulting from a rerouting and/or flood of glacial meltwater into the North Atlantic or a meteorite impact. Yet, these mechanisms are less frequently considered as the cause of the earlier stadials. Using a robust multivariate outlier detection scheme – a novel approach for traditional paleoclimate research – we show that the pattern of climate change during the BA/YD is not statistically different from the other D–O events in the Greenland record and that it should not necessarily be considered unique when investigating the drivers of abrupt climate change. In so doing, our results present a novel statistical framework for paleoclimatic data analysis. |
format |
Text |
author |
Nye, Henry Condron, Alan |
spellingShingle |
Nye, Henry Condron, Alan Assessing the statistical uniqueness of the Younger Dryas: a robust multivariate analysis |
author_facet |
Nye, Henry Condron, Alan |
author_sort |
Nye, Henry |
title |
Assessing the statistical uniqueness of the Younger Dryas: a robust multivariate analysis |
title_short |
Assessing the statistical uniqueness of the Younger Dryas: a robust multivariate analysis |
title_full |
Assessing the statistical uniqueness of the Younger Dryas: a robust multivariate analysis |
title_fullStr |
Assessing the statistical uniqueness of the Younger Dryas: a robust multivariate analysis |
title_full_unstemmed |
Assessing the statistical uniqueness of the Younger Dryas: a robust multivariate analysis |
title_sort |
assessing the statistical uniqueness of the younger dryas: a robust multivariate analysis |
publishDate |
2021 |
url |
https://doi.org/10.5194/cp-17-1409-2021 https://cp.copernicus.org/articles/17/1409/2021/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet North Atlantic |
genre_facet |
Greenland Ice Sheet North Atlantic |
op_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-17-1409-2021 https://cp.copernicus.org/articles/17/1409/2021/ |
op_doi |
https://doi.org/10.5194/cp-17-1409-2021 |
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Climate of the Past |
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17 |
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3 |
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1409 |
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1421 |
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1766017619624722432 |