Model evidence for a seasonal bias in Antarctic ice cores
| Autor: | Pedro N. DiNezio, Anthony J. Broccoli, Michel Crucifix, Paul J. Valdes, David W. Lea, M. P. Erb, Charles S. Jackson |
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| Přispěvatelé: | UCL - SST/ELI/ELIC - Earth & Climate |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
010504 meteorology & atmospheric sciences
Science General Physics and Astronomy 010502 geochemistry & geophysics 01 natural sciences General Biochemistry Genetics and Molecular Biology Proxy (climate) Article Latitude Physics::Geophysics Ice core Glacial period Mean radiant temperature lcsh:Science Physics::Atmospheric and Oceanic Physics 0105 earth and related environmental sciences geography Multidisciplinary geography.geographical_feature_category General Chemistry 13. Climate action Climatology Greenhouse gas Physics::Space Physics lcsh:Q Astrophysics::Earth and Planetary Astrophysics Ice sheet Quaternary Geology |
| Zdroj: | Nature Communications, Vol 9, Iss 1, Pp 1-10 (2018) Nature Communications, Vol. 9, no.1, p. 1361 (2018) Erb, M P, Jackson, C S, Broccoli, A J, Lea, D W, Valdes, P J, Crucifix, M & DiNezio, P N 2018, ' Model evidence for a seasonal bias in Antarctic ice cores ', Nature Communications, vol. 9, 1361 . https://doi.org/10.1038/s41467-018-03800-0 Nature Communications |
| ISSN: | 2041-1723 |
| DOI: | 10.1038/s41467-018-03800-0 |
| Popis: | Much of the global annual mean temperature change over Quaternary glacial cycles can be attributed to slow ice sheet and greenhouse gas feedbacks, but analysis of the short-term response to orbital forcings has the potential to reveal key relationships in the climate system. In particular, obliquity and precession both produce highly seasonal temperature responses at high latitudes. Here, idealized single-forcing model experiments are used to quantify Earth’s response to obliquity, precession, CO2, and ice sheets, and a linear reconstruction methodology is used to compare these responses to long proxy records around the globe. This comparison reveals mismatches between the annual mean response to obliquity and precession in models versus the signals within Antarctic ice cores. Weighting the model-based reconstruction toward austral winter or spring reduces these discrepancies, providing evidence for a seasonal bias in ice cores. Periodic changes in the tilt of the Earth’s axis alter the distribution of incoming solar radiation. Here, the authors show that the temperature response to this forcing seemingly differs in models and Antarctic ice cores, with a better agreement reached if ice cores are recording a seasonally weighted signal. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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