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Title: The two-step shape and timing of the last deglaciation in Antarctica

Abstract

The two-step character of the last deglaciation is well recognized in Western Europe, in Greenland and in the North Atlantic. For example, in Greenland, a gradual temperature decrease started at the Boelling (B) around 14.5 ky BP, spanned through the Alleroed (A) and was followed by the cold Younger Dryas (YD) event which terminated abruptly around 11.5 ky BP. Recent results suggest that this BA/YD sequence may have extended throughout all the Northern Hemisphere but the evidence of a late transition cooling is still poor for the Southern Hemisphere. Here we present a detailed isotopic record analyzed in a new ice core drilled at Dome B in East Antarctica that fully demonstrates the existence of an Antarctic cold reversal (ACR). These results suggest that the two-step shape of the last deglaciation has a worldwide character but they also point to noticeable interhemispheric differences. Thus. the coldest part of the ACR. which shows a temperature drop about three times weaker than that recorded during the YD in Greenland, may have preceded the YD. Antarctica did not experienced abrupt changes and the two warming periods started there before they started in Greenland. The links between Southern and Northern Hemisphere climates throughout thismore » period are discussed in the light of additional information derived from the Antarctic dust record. 87 refs., 5 figs.« less

Authors:
;  [1];  [2]
  1. Laboratoire de Modelisation du Climat et de l`Environnement, Gif sur Yvette (France)
  2. Laboratoire de Modelisation du Climat et de l`Environnement, Gif sur Yvette (France); and others
Publication Date:
OSTI Identifier:
285029
Resource Type:
Journal Article
Journal Name:
Climate Dynamics
Additional Journal Information:
Journal Volume: 11; Journal Issue: 3; Other Information: PBD: Apr 1995
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; CLIMATIC CHANGE; VARIATIONS; ANTARCTICA; GLACIERS; PALEOCLIMATOLOGY

Citation Formats

Jouzel, J, Petit, J R, Laboratoire de Glaciologie et Geophysique de l`environnement, Saint Martin d`Heres, and Duclos, Y. The two-step shape and timing of the last deglaciation in Antarctica. United States: N. p., 1995. Web. doi:10.1007/s003820050067.
Jouzel, J, Petit, J R, Laboratoire de Glaciologie et Geophysique de l`environnement, Saint Martin d`Heres, & Duclos, Y. The two-step shape and timing of the last deglaciation in Antarctica. United States. https://doi.org/10.1007/s003820050067
Jouzel, J, Petit, J R, Laboratoire de Glaciologie et Geophysique de l`environnement, Saint Martin d`Heres, and Duclos, Y. 1995. "The two-step shape and timing of the last deglaciation in Antarctica". United States. https://doi.org/10.1007/s003820050067.
@article{osti_285029,
title = {The two-step shape and timing of the last deglaciation in Antarctica},
author = {Jouzel, J and Petit, J R and Laboratoire de Glaciologie et Geophysique de l`environnement, Saint Martin d`Heres and Duclos, Y},
abstractNote = {The two-step character of the last deglaciation is well recognized in Western Europe, in Greenland and in the North Atlantic. For example, in Greenland, a gradual temperature decrease started at the Boelling (B) around 14.5 ky BP, spanned through the Alleroed (A) and was followed by the cold Younger Dryas (YD) event which terminated abruptly around 11.5 ky BP. Recent results suggest that this BA/YD sequence may have extended throughout all the Northern Hemisphere but the evidence of a late transition cooling is still poor for the Southern Hemisphere. Here we present a detailed isotopic record analyzed in a new ice core drilled at Dome B in East Antarctica that fully demonstrates the existence of an Antarctic cold reversal (ACR). These results suggest that the two-step shape of the last deglaciation has a worldwide character but they also point to noticeable interhemispheric differences. Thus. the coldest part of the ACR. which shows a temperature drop about three times weaker than that recorded during the YD in Greenland, may have preceded the YD. Antarctica did not experienced abrupt changes and the two warming periods started there before they started in Greenland. The links between Southern and Northern Hemisphere climates throughout this period are discussed in the light of additional information derived from the Antarctic dust record. 87 refs., 5 figs.},
doi = {10.1007/s003820050067},
url = {https://www.osti.gov/biblio/285029}, journal = {Climate Dynamics},
number = 3,
volume = 11,
place = {United States},
year = {Sat Apr 01 00:00:00 EST 1995},
month = {Sat Apr 01 00:00:00 EST 1995}
}