Bölling alleröd warming
Robinson, L. Radiocarbon variability in the western North Atlantic during the last deglaciation. USA , E—E Broecker, W. Insolation changes, ice volumes, and the O18 record in deep-sea cores. The abrupt warming that initiated the Bølling–Allerød interstadial was the penultimate warming in a series of climate variations known as Dansgaard–Oeschger events. [2]. This is a preview of subscription content, access via your institution.
The Heinrich stadial 1 ocean profile is distinct from the modern water column, that for the Last Glacial Maximum and that for the Younger Dryas, suggesting that the patterns we observe are a unique feature of the deglacial climate system. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer.
Several large and rapid changes in atmospheric temperature and the partial pressure of carbon dioxide in the atmosphere 1 —probably linked to changes in deep ocean circulation 2 —occurred during the last deglaciation. Weaver, A. Meltwater pulse 1A from Antarctica as a trigger of the Bølling-Allerød warm interval. Denton, G. The role of seasonality in abrupt climate change. This warm period ran from 14, to 12, years before the present (BP).
Petit, J. Climate and atmospheric history of the past , years from the Vostok ice core, Antarctica. Clark, P. Global climate evolution during the last deglaciation. Here we show that the release of heat from warm waters in the deep North Atlantic Ocean probably triggered the Bølling—Allerød warming and reinvigoration of the Atlantic meridional overturning circulation. Natl Acad. The depleted radiocarbon content of the warm and salty water mass implies a long-term disconnect from rapid surface exchanges, and, although uncertainties remain, is most consistent with a Southern Ocean source.
Coastal permafrost was massively eroded during the Bølling-Allerød warm period
Acta 75 , — The Bølling–Allerød interstadial (Danish: [ˈpøle̝ŋ ˈæləˌʁœðˀ]), also called the Late Glacial Interstadial, was an abrupt warm and moist interstadial period that occurred during the final stages of the Last Glacial Period. Our results are based on coupled radiocarbon and uranium-series dates, along with clumped isotope temperature estimates, from water column profiles of fossil deep-sea corals in a limited area of the western North Atlantic.
Knorr, G. Southern Ocean origin for the resumption of Atlantic thermohaline circulation during deglaciation. Bard, E. Hydrological impact of Heinrich events in the subtropical Northeast Atlantic. Nature , — McManus, J. Collapse and rapid resumption of Atlantic meridional circulation linked to deglacial climate changes.
Abrupt pre-Bølling–Allerød warming and circulation changes in the deep ocean
Thiagarajan, N. Carbonate clumped isotope thermometry of deep-sea corals and implications for vital effects. We find that during Heinrich stadial 1 the cool period immediately before the Bølling—Allerød interstadial , the deep ocean was about three degrees Celsius warmer than shallower waters above. Rogerson, M. Enhanced Mediterranean-Atlantic exchange during Atlantic freshening phases.
Adkins, J. Deep-sea coral evidence for rapid change in ventilation of the deep North Atlantic 15, years ago. Our observations indicate that the deep ocean influenced dramatic Northern Hemisphere warming by storing heat at depth that preconditioned the system for a subsequent abrupt overturning event during the Bølling—Allerød interstadial. Despite the clear. The abrupt temperature rise in the Northern Hemisphere and the restart of the Atlantic meridional overturning circulation at the start of the Bølling—Allerød interstadial, 14, years ago, are among the most dramatic deglacial events 3 , but their underlying physical causes are not known.
Thank you for visiting nature. Science , — Liu, Z. Transient simulation of last deglaciation with a new mechanism for Bølling-Allerød warming.