Assessing the statistical uniqueness of the Younger Dryas: a robust multivariate analysis

Thumbnail Image
Date
2021-06-30
Authors
Nye, Henry
Condron, Alan
Linked Authors
Person
Person
Alternative Title
Date Created
Location
DOI
10.5194/cp-17-1409-2021
Replaced By
Keywords
Abstract
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.
Description
© The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Nye, H., & Condron, A. Assessing the statistical uniqueness of the Younger Dryas: a robust multivariate analysis. Climate of the Past, 17(3), (2021): 1409–1421, https://doi.org/10.5194/cp-17-1409-2021.
Embargo Date
Citation
Nye, H., & Condron, A. (2021). Assessing the statistical uniqueness of the Younger Dryas: a robust multivariate analysis. Climate of the Past, 17(3), 1409–1421.
Cruises
Cruise ID
Cruise DOI
Vessel Name
Except where otherwise noted, this item's license is described as Attribution 4.0 International