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Tropical mountain ice core d18O: A Goldilocks indicator for global temperature change.
- Source :
-
Science Advances . 11/10/2023, Vol. 9 Issue 45, p1-14. 14p. - Publication Year :
- 2023
-
Abstract
- 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 stablewater oxygen isotopic ratio in ice cores (d18Oice), remains an outstanding problem. Here, combining proxy records with climate models, modern satellite measurements, and radiative-convective equilibrium theory, we show that the tropical d18Oice 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 23752548
- Volume :
- 9
- Issue :
- 45
- Database :
- Academic Search Index
- Journal :
- Science Advances
- Publication Type :
- Academic Journal
- Accession number :
- 173508417
- Full Text :
- https://doi.org/10.1126/sciadv.adi6725