Antarctic surface temperature and elevation during the Last Glacial Maximum

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...

Full description

Bibliographic Details
Published in:Science
Main Authors: 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, Jerome, 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, Schwander, Jakob
Format: Article in Journal/Newspaper
Language:English
Published: 2021
Subjects:
ABRUPT CLIMATE-CHANGE
EPICA DOME-C
ATMOSPHERIC NITROUS-OXIDE
CORE WD2014 CHRONOLOGY
VOSTOK ICE CORE
AIR-CONTENT
SIPLE DOME
POLAR ICE
VOLCANIC SYNCHRONIZATION
ISOTOPIC COMPOSITION
Antarctic
East Antarctica
Siple
Siple Dome
Antarc*
Antarctica
EPICA
ice core
Online Access:https://curis.ku.dk/portal/da/publications/antarctic-surface-temperature-and-elevation-during-the-last-glacial-maximum(2d10f8a1-f35b-45cc-9158-0d51d9407200).html
https://doi.org/10.1126/science.abd2897
https://curis.ku.dk/ws/files/313701905/Buizert_revision_combined_submit_021821_1_3_62.pdf
Description
Summary: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 similar to 10 degrees C relative to the preindustrial period. East Antarctic sites show a range from similar to 4 degrees to similar to 7 degrees 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.

Similar Items