Antarctic surface temperature and elevation during the Last Glacial Maximum

Buizert, Christo, Fudge, T. J., Roberts, William H. G., Steig, Eric J., Sherriff-Tadano, Sam, Ritz, Catherine, Lefebvre, Eric, Edwards, Jon, Kawamura, Kenji, Oyabu, Ikumi, Motoyama, Hideaki, Kahle, Emma C., Jones, Tyler R., Abe-Ouchi, Ayako, Obase, Takashi, Martin, Carlos, Corr, Hugh, Severinghaus, Jeffrey P., Beaudette, Ross, Epifanio, Jenna A., Brook, Edward J., Martin, Kaden, Chappellaz, Jérôme, Aoki, Shuji, Nakazawa, Takakiyo, Sowers, Todd A., Alley, Richard B., Ahn, Jinho, Sigl, Michael, Severi, Mirko, Dunbar, Nelia W., Svensson, Anders, Fegyveresi, John M., He, Chengfei, Liu, Zhengyu, Zhu, Jiang, Otto-Bliesner, Bette L., Lipenkov, Vladimir Y., Kageyama, Masa and Schwander, Jakob (2021) Antarctic surface temperature and elevation during the Last Glacial Maximum. Science, 372 (6546). pp. 1097-1101. ISSN 0036-8075

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Official URL: https://doi.org/10.1126/science.abd2897

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.

Item Type: Article
Subjects: F700 Ocean Sciences
F800 Physical and Terrestrial Geographical and Environmental Sciences
Department: Faculties > Engineering and Environment > Geography and Environmental Sciences
Depositing User: John Coen
Date Deposited: 09 Jun 2021 08:50
Last Modified: 09 Jun 2021 09:00
URI: http://nrl.northumbria.ac.uk/id/eprint/46390

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