Stable stadial and interstadial states of the last glacial's climate identified in a combined stable water isotope and dust record from Greenland ...

• Main Authors: Riechers, Keno, Rydin Gorjão, Leonardo, Hassanibesheli, Forough, Lind, Pedro G., Witthaut, Dirk, Boers, Niklas
• Format: Text
• Language: English
• Published: Forschungzentrum Jülich 2023
• Subjects: 550; Greenland; Greenland ice core; Greenland Ice core Project; Greenland ice cores; ice core; NGRIP; North Atlantic; North Greenland; North Greenland Ice Core Project
• Online Access: https://dx.doi.org/10.34734/fzj-2023-03012; https://juser.fz-juelich.de/record/1010203

Earth System Dynamics 14(3), 593 - 607 (2023). doi:10.5194/esd-14-593-2023 ... : During the last glacial interval, the Northern Hemisphere climate was punctuated by a series of abrupt changes between two characteristic climate regimes. The existence of stadial (cold) and interstadial (milder) periods is typically attributed to a hypothesised bistability in the glacial North Atlantic climate system, allowing for rapid transitions from the stadial to the interstadial state – the so-called Dansgaard–Oeschger (DO) events – and more gradual yet still fairly abrupt reverse shifts. The physical mechanisms driving these regime transitions remain debated. DO events are characterised by substantial warming over Greenland and a reorganisation of the Northern Hemisphere atmospheric circulation, which are evident from concomitant shifts in the δ18O ratios and dust concentration records from Greenland ice cores. Treating the combined δ18O and dust record obtained by the North Greenland Ice Core Project (NGRIP) as a realisation of a two-dimensional, time-homogeneous, and Markovian stochastic process, ...