| Literature DB >> 34083489 |
Christo Buizert1, T J Fudge2, William H G Roberts3, Eric J Steig2, Sam Sherriff-Tadano4, Catherine Ritz5, Eric Lefebvre5, Jon Edwards6, Kenji Kawamura7,8,9, Ikumi Oyabu7, Hideaki Motoyama7, Emma C Kahle2, Tyler R Jones10, Ayako Abe-Ouchi4, Takashi Obase4, Carlos Martin11, Hugh Corr11, Jeffrey P Severinghaus12, Ross Beaudette12, Jenna A Epifanio6, Edward J Brook6, Kaden Martin6, Jérôme Chappellaz5, Shuji Aoki13, Takakiyo Nakazawa13, Todd A Sowers14, Richard B Alley15, Jinho Ahn14, Michael Sigl16, Mirko Severi17,18, Nelia W Dunbar19, Anders Svensson20, John M Fegyveresi21, Chengfei He22, Zhengyu Liu22, Jiang Zhu23, Bette L Otto-Bliesner23, Vladimir Y Lipenkov24, Masa Kageyama25, Jakob Schwander16.
Abstract
Water-stable isotopes in polar ice cores are a widely used temperature proxy in paleoclimate reconstruction, yet calibration remains challenging in East Antarctica. Here, we reconstruct the magnitude and spatial pattern of Last Glacial Maximum surface cooling in Antarctica using borehole thermometry and firn properties in seven ice cores. West Antarctic sites cooled ~10°C relative to the preindustrial period. East Antarctic sites show a range from ~4° to ~7°C cooling, which is consistent with the results of global climate models when the effects of topographic changes indicated with ice core air-content data are included, but less than those indicated with the use of water-stable isotopes calibrated against modern spatial gradients. An altered Antarctic temperature inversion during the glacial reconciles our estimates with water-isotope observations.Entities:
Year: 2021 PMID： 34083489 DOI： 10.1126/science.abd2897
Source DB: PubMed Journal: Science ISSN： 0036-8075 Impact factor: 47.728