Erlangen 2018 – wissenschaftliches Programm
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UP: Fachverband Umweltphysik
UP 5: Atmosphere - trace gases, aerosols; Methods -measurement techniques
UP 5.5: Vortrag
Montag, 5. März 2018, 16:15–16:30, G 1.011
Effectiveness and impacts of stratospheric aerosol injection studied with a global atmosphere-aerosol model — •Christoph Kleinschmitt1,2, Olivier Boucher3, and Ulrich Platt1 — 1Institute of Environmental Physics, Heidelberg University, Germany — 2Laboratoire de Météorologie Dynamique, Paris, France — 3Institut Pierre-Simon Laplace, Paris, France
Climate engineering is currently being discussed as an option to prevent or at least reduce the magnitude of global warming. Stratospheric aerosol injection (SAI) in analogy to major volcanic eruptions is probably the most prominent of the proposed techniques. Numerous modelling studies on SAI have been published during recent years, mostly proving its power to reduce the global mean surface temperature significantly, but also revealing potential risks and undesirable side effects on the climate system.
For a robust estimate of the cooling potential of SAI we developed a 3D aerosol model with a sectional approach fully coupled to the radiative scheme and other aspects of the IPSL climate model. This allows us to study physical effects limiting the radiative forcing, such as absorption and reemission of infrared radiation, particle growth through condensation and coagulation and changes in particle lifetime due to transport within the stratosphere.
We will present results of model simulations under various SAI scenarios and discuss the effectiveness and limitations of the method as well as its impacts on the atmosphere (e.g. stratospheric heating and circulation changes) and at the Earth’s surface.