Bølling–Allerød warming

The Bølling–Allerød interstadial was an abrupt warm and moist interstadial period that occurred during the final stages of the last glacial period. This warm period ran from 14,690 to 12,890 years before the present (BP).[2] It began with the end of the cold period known as the Oldest Dryas, and ended abruptly with the onset of the Younger Dryas, a cold period that reduced temperatures back to near-glacial levels within a decade.[3]

The Bølling–Allerød warming within the Post-Glacial period that followed the Last Glacial Maximum (LGM). Evolution of temperature in the Post-Glacial period according to Greenland ice cores.[1]

In some regions, a cold period known as the Older Dryas can be detected in the middle of the Bølling–Allerød interstadial. In these regions the period is divided into the Bølling oscillation, which peaked around 14,500 BP, and the Allerød oscillation, which peaked closer to 13,000 BP.

Estimates of CO
2 rise are 20–35 ppmv within 200 years, a rate less than 29–50% compared to the anthropogenic global warming signal from the past 50 years, and with a radiative forcing of 0.59–0.75 W m−2.[4]

History
North Greenland Ice Core Project Oxygen Isotope Data.
Calcium concentration and d18O isotope ratios from the Greenland NGRIP, GRIP, and GISP2 ice cores on the GICC05 time scale.
Methane (CH4) record from the North Greenland Ice Sheet Project (NGRIP) ice core, Greenland,

In 1901, Danish geologists Nikolaj Hartz (1867–1937) and Vilhelm Milthers (1865–1962) provided evidence for climatic warming during the last glacial period, sourced from a clay-pit near Allerød (Denmark).[5][6]

Effects

It has been postulated that teleconnections, oceanic and atmospheric processes, on different timescales, connect both hemispheres during abrupt climate change.[7]

The Meltwater pulse 1A event coincides with or closely follows the abrupt onset of the Bølling–Allerød (BA), when global sea level rose ~16 m during this event at rates of 26–53 mm/yr.[8]

Records obtained from the Gulf of Alaska show abrupt sea-surface warming of about 3 °C (in less than 90 years), matching ice-core records that register this transition as occurring within decades.[9]

Scientists from the Center for Arctic Gas Hydrate (CAGE), Environment and Climate at the University of Tromsø, published a study in June 2017, describing over a hundred ocean sediment craters, some 3,000 meters wide and up to 300 meters deep, formed due to explosive eruptions, attributed to destabilizing methane hydrates, following ice-sheet retreat during the last glacial period, around 12,000 years ago, a few centuries after the Bølling–Allerød warming. These areas around the Barents Sea, still seep methane today, and still-existing bulges with methane reservoirs could eventually have the same fate.[10]

Ice-sheet retreat
See also: Glaciovolcanism

Isostatic rebound in response to glacier retreat (unloading), increase in local salinity (i.e., δ18Osw), have been attributed to increased volcanic activity at the onset of Bølling–Allerød, are associated with the interval of intense volcanic activity, hinting at an interaction between climate and volcanism - enhanced short-term melting of glaciers, possibly via albedo changes from particle fallout on glacier surfaces.[9]

The second Weichselian Icelandic ice sheet collapse, onshore (est. net wastage 221 Gt a−1 over 750 years), similar to today's Greenland rates of mass loss, has been attributed to atmospheric Bølling–Allerød warming. Furthermore, the study authors noted:

Geothermal conditions impart a significant control on the ice sheet's transient response, particularly during phases of rapid retreat. Insights from this study suggests that large sectors of contemporary ice sheets overlying geothermally active regions, such as Siple Coast, Antarctica, and NE Greenland, have the potential to experience rapid phases of mass loss and deglaciation once initial retreat is initiated.[11]

Flora

Ice uncovered large parts of north Europe and temperate forests covered Europe from N 29° to 41° latitude. Pioneer vegetation, such as Salix polaris and Dryas octopetala, began to grow in regions that were previously too cold to support these plants. Later, mixed evergreen and deciduous forests prevailed in Eurasia, more deciduous toward the south, just as today. Birch, Aspen, spruce, pine, larch and juniper were to be found extensively, mixed with Quercus and Corylus. Poaceae was to be found in more open regions.

Fauna

During this time late Pleistocene animals spread northward from refugia in the three peninsulas, Iberian Peninsula, Italy and the Balkans. Geneticists can identify the general location by studying degrees of consanguinity in the modern animals of Europe. Many animal species were able to move into regions far more northerly than they could have survived in during the preceding colder periods. Reindeer, horse, saiga, antelope, bison, woolly mammoth and woolly rhinoceros were attested, and were hunted by early man. In the alpine regions ibex and chamois were hunted. Throughout the forest were red deer. Smaller animals, such as fox, wolf, hare and squirrel also appear. Salmon was fished. When this interstadial period ended, with the onset of the Younger Dryas, many of these species were forced to migrate south or become regionally extinct.

Causes

In recent years research tied the Bølling–Allerød warming to the release of heat from warm waters originating from the deep North Atlantic Ocean, possibly triggered by a strengthening of the Atlantic meridional overturning circulation (AMOC) at the time.[12][13]

Study results which would help to explain the abruptness of the Bølling–Allerød warming, based on observations and simulations, found that 3°–5 °C Ocean warming occurred at intermediate depths in the North Atlantic over several millennia during Heinrich stadial 1 (HS1). The authors postulated that this warm salty water (WSW) layer, situated beneath the colder surface freshwater in the North Atlantic, generated ocean convective available potential energy (OCAPE) over decades at the end of HS1. According to fluid modelling, at one point the accumulation of OCAPE was released abruptly (~1 month) into kinetic energy of thermobaric cabbeling convection (TCC), resulting in the warmer salty waters getting to the surface and subsequently warming of ca. 2 °C sea surface warming.[14]

Human cultures

Humans reentered the forests of Europe in search of big game, which they were beginning to hunt relentlessly, many to extinction. Their cultures were the last of the Late Upper Palaeolithic. Magdalenian hunters moved up the Loire into the Paris Basin. In the drainage basin of the Dordogne, the Perigordian prevailed. The Epigravettian dominated Italy. In the north, the Hamburgian and Federmesser cultures are found. The Lyngby, Bromme, Ahrensburg and Swiderian were also attested in Europe at this time. To the south and far east the Neolithic had already begun. In the middle east, the pre-agricultural Natufian settled around the east coast of the Mediterranean to exploit wild cereals, such as emmer and two-row barley. In the Allerød they would begin to domesticate these plants.

See also

Sources
  1. Zalloua, Pierre A.; Matisoo-Smith, Elizabeth (6 January 2017). "Mapping Post-Glacial expansions: The Peopling of Southwest Asia". Scientific Reports. 7: 40338. Bibcode:2017NatSR...740338P. doi:10.1038/srep40338. ISSN 2045-2322. PMC 5216412. PMID 28059138.
  2. Rasmussen, S. O.; Andersen, K. K.; Svensson, A. M.; Steffensen, J. P.; Vinther, B. M.; Clausen, H. B.; Siggaard-Andersen, M.-L.; Johnsen, S. J.; Larsen, L. B.; Dahl-Jensen, D.; Bigler, M. (2006). "A new Greenland ice core chronology for the last glacial termination". Journal of Geophysical Research. 111 (D6): D06102. Bibcode:2006JGRD..111.6102R. doi:10.1029/2005JD006079. ISSN 0148-0227.
  3. Wade, Nicholas (2006). Before the Dawn. New York: Penguin Press. p. 123. ISBN 978-1-59420-079-3.
  4. Köhler; et al. (2011). "Abrupt rise in atmospheric CO2 at the onset of the Bølling/Allerød: in-situ ice core data versus true atmospheric signals". Climate of the Past. 7 (2): 473–486. Bibcode:2011CliPa...7..473K. doi:10.5194/cp-7-473-2011.
  5. Wim Z. Hoek (2009). "Bølling-Allerød Interstadial". Encyclopedia of Paleoclimatology and Ancient Environments. Encyclopedia of Earth Sciences Series. Encyclopedia of Earth Sciences Series. pp. 100–103. doi:10.1007/978-1-4020-4411-3_26. ISBN 978-1-4020-4551-6.
  6. Hartz, N.; Milthers, V. (1901). "Det senglaciale Ler i Allerød Teglværkgrav" [The late glacial clay of the clay-pit at Alleröd]. Meddelelser Fra Dansk Geologisk Forening (Bulletin of the Geological Society of Denmark) (in Danish). 2 (8): 31–60.
  7. Markle; et al. (2016). "Global atmospheric teleconnections during Dansgaard–Oeschger events". Nature Geoscience. 10: 36–40. doi:10.1038/ngeo2848.
  8. Gornitz (2012). "The Great Ice Meltdown and Rising Seas: Lessons for Tomorrow". NASA.
  9. Praetorius; et al. (2016). "Interaction between climate, volcanism, and isostatic rebound in Southeast Alaska during the last deglaciation". Earth and Planetary Science Letters. 452: 79–89. Bibcode:2016E&PSL.452...79P. doi:10.1016/j.epsl.2016.07.033.
  10. "Like 'champagne bottles being opened': Scientists document an ancient Arctic methane explosion". The Washington Post. June 1, 2017.
  11. Patton; et al. (2017). "The configuration, sensitivity and rapid retreat of the Late Weichselian Icelandic ice sheet" (PDF). Earth-Science Reviews. 166: 223–245. Bibcode:2017ESRv..166..223P. doi:10.1016/j.earscirev.2017.02.001. hdl:1893/25102.
  12. Thiagarajan; et al. (2014). "Abrupt pre-Bølling–Allerød warming and circulation changes in the deep ocean" (PDF). Nature. 511 (7507): 75–78. Bibcode:2014Natur.511...75T. doi:10.1038/nature13472. PMID 24990748. S2CID 4460693.
  13. Lohmann; et al. (2016). "Abrupt climate change experiments: the role of freshwater, ice sheets and deglacial warming for the Atlantic Meridional Overturning Circulation" (PDF). Polarforschung; 85. doi:10.2312/polfor.2016.013.
  14. Su; et al. (2016). "On the Abruptness of Bølling–Allerød Warming" (PDF). Journal of Climate. 29 (13): 4965–4975. Bibcode:2016JCli...29.4965S. doi:10.1175/JCLI-D-15-0675.1.
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