Snowball Earth Bifurcations in a Fully-Implicit Earth System Model
| Autor: | Mulder, Thomas E., Goelzer, Heiko, Wubs, Fred W., Dijkstra, Henk A., Sub Dynamics Meteorology, Sub Physical Oceanography, Marine and Atmospheric Research |
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| Přispěvatelé: | Sub Dynamics Meteorology, Sub Physical Oceanography, Marine and Atmospheric Research, Computational and Numerical Mathematics |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
010506 paleontology
010504 meteorology & atmospheric sciences snowball Earth Applied Mathematics Geophysics Geological evidence 01 natural sciences Physics::Geophysics Earth system model Bifurcation analysis Modeling and Simulation Modelling and Simulation Physics::Space Physics Snowball Earth Earth (chemistry) Astrophysics::Earth and Planetary Astrophysics General Engineering (miscellaneous) Physics::Atmospheric and Oceanic Physics Geology 0105 earth and related environmental sciences |
| Zdroj: | International Journal of Bifurcation and Chaos, 31(6). World Scientific Publishing Co. Pte Ltd International Journal of Bifurcation and Chaos in Applied Sciences and Engineering International Journal of Bifurcation and Chaos, 31(6):2130017. World Scientific Publishing |
| ISSN: | 0218-1274 |
| Popis: | There is now much geological evidence that the Earth was fully glaciated during several periods in the geological past (about 700[Formula: see text]Myr ago) and attained a so-called Snowball Earth (SBE) state. Additional support for this idea has come from climate models of varying complexity that show transitions to SBE states and undergo hysteresis under changes in solar radiation. In this paper, we apply large-scale bifurcation analyses to a novel, fully-implicit Earth System Model of Intermediate Complexity (I-EMIC) to study SBE transitions. The I-EMIC contains a primitive equation ocean model, a model for atmospheric heat and moisture transport, a sea ice component and formulations for the adjustment of albedo over snow and ice. With the I-EMIC, high-dimensional branches of the SBE bifurcation diagram are obtained through parameter continuation. We are able to identify stable and unstable equilibria and uncover an intricate bifurcation structure associated with the ice-albedo feedback. Moreover, large-scale linear stability analyses are performed near major bifurcations, revealing the spatial nature of destabilizing perturbations. |
| Databáze: | OpenAIRE |
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