TY - JOUR
T1 - Tropical mountain ice core δ18O
T2 - A Goldilocks indicator for global temperature change
AU - Liu, Zhengyu
AU - Bao, Yuntao
AU - Thompson, Lonnie G.
AU - Mosley-Thompson, Ellen
AU - Tabor, Clay
AU - Zhang, Guang J.
AU - Yan, Mi
AU - Lofverstrom, Marcus
AU - Montanez, Isabel
AU - Oster, Jessica
N1 - Publisher Copyright: © 2023 American Association for the Advancement of Science. All rights reserved.
PY - 2023/11/10
Y1 - 2023/11/10
N2 - Very high tropical alpine ice cores provide a distinct paleoclimate record for climate changes in the middle and upper troposphere. However, the climatic interpretation of a key proxy, the stable water oxygen isotopic ratio in ice cores (δ18Oice), remains an outstanding problem. Here, combining proxy records with climate models, modern satellite measurements, and radiative-convective equilibrium theory, we show that the tropical δ18Oice is an indicator of the temperature of the middle and upper troposphere, with a glacial cooling of −7.35° ± 1.1°C (66% CI). Moreover, it severs as a “Goldilocks-type” indicator of global mean surface temperature change, providing the first estimate of glacial stage cooling that is independent of marine proxies as −5.9° ± 1.2°C. Combined with all estimations available gives the maximum likelihood estimate of glacial cooling as −5.85° ± 0.51°C.
AB - Very high tropical alpine ice cores provide a distinct paleoclimate record for climate changes in the middle and upper troposphere. However, the climatic interpretation of a key proxy, the stable water oxygen isotopic ratio in ice cores (δ18Oice), remains an outstanding problem. Here, combining proxy records with climate models, modern satellite measurements, and radiative-convective equilibrium theory, we show that the tropical δ18Oice is an indicator of the temperature of the middle and upper troposphere, with a glacial cooling of −7.35° ± 1.1°C (66% CI). Moreover, it severs as a “Goldilocks-type” indicator of global mean surface temperature change, providing the first estimate of glacial stage cooling that is independent of marine proxies as −5.9° ± 1.2°C. Combined with all estimations available gives the maximum likelihood estimate of glacial cooling as −5.85° ± 0.51°C.
UR - https://www.scopus.com/pages/publications/85184057695
UR - https://www.scopus.com/pages/publications/85184057695#tab=citedBy
U2 - 10.1126/SCIADV.ADI6725
DO - 10.1126/SCIADV.ADI6725
M3 - Article
SN - 2375-2548
VL - 9
JO - Science Advances
JF - Science Advances
IS - 45
M1 - eadi6725
ER -