A5093217721- Atmospheric and Environmental Gas Dynamics
- Climate variability and models
- Geology and Paleoclimatology Research
Earth Island Institute
2023
Columbia University
2023
Abstract Improved knowledge of glacial-to-interglacial global temperature change yields Charney (fast-feedback) equilibrium climate sensitivity 1.2 ± 0.3°C (2σ) per W/m2, which is 4.8°C 1.2°C for doubled CO2. Consistent analysis over the full Cenozoic era—including ‘slow’ feedbacks by ice sheets and trace gases—supports this implies that CO2 was 300–350 ppm in Pliocene about 450 at transition to a nearly ice-free planet, exposing unrealistic lethargy sheet models. Equilibrium warming today’s...
Polar stratospheric clouds (PSCs) play a fundamental role in depleting ozone. Heterogeneous reactions on their surfaces increase the concentration of active chlorine, which can catalytically destroy ozone and prolong depletion by denitrifying dehydrating stratosphere. However, parametrisations PSC formation is poorly included global chemistry-climate models due to complexity microphysical processes involved particle formation. This limits our ability project future recovery resulting climate...