Observationally Constrained Cloud Phase Unmasks Orbitally Driven Climate Feedbacks
| Autor: | Anthony J. Broccoli, Navjit Sagoo, James F. Danco, Lily Caroline Hahn, Trude Storelvmo, Bryan Keith Raney, Ivy Tan |
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| Rok vydání: | 2023 |
| Předmět: |
Insolation
010504 meteorology & atmospheric sciences Pleistocene business.industry Phase (waves) Cloud computing 010502 geochemistry & geophysics 01 natural sciences Physics::Geophysics Geophysics 13. Climate action Climatology Paleoclimatology General Earth and Planetary Sciences Astrophysics::Earth and Planetary Astrophysics sense organs business Astrophysics::Galaxy Astrophysics Physics::Atmospheric and Oceanic Physics Geology 0105 earth and related environmental sciences |
| Zdroj: | Geophysical Research Letters |
| ISSN: | 0094-8276 |
| DOI: | 10.5194/egusphere-egu23-16726 |
| Popis: | The mechanisms that amplify orbitally-driven changes in insolation and drive the glacial cycles of the past 2.6 million years, the Pleistocene, are poorly understood. Previous studies indicate that cloud-phase feedbacks oppose ice sheet initiation when orbital configuration supports ice sheet growth. Cloud phase was observationally constrained in a recent study and provides evidence for a weaker negative cloud feedback in response to carbon dioxide doubling. We observationally constrain cloud phase in the Community Earth System Model and explore how changes in orbital configuration impact the climate response. Constraining cloud phase weakens the negative high latitude cloud phase feedback and unmasks positive water vapor and cloud feedbacks (amount and optical depth) that extend cooling to lower latitudes. Snowfall accumulation and ablation metrics also support ice sheet expansion as seen in proxy records. This indicates that well-known cloud and water vapor feedbacks are the mechanisms amplifying orbital climate forcing. |
| Databáze: | OpenAIRE |
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