The Hydrological Impact of Geoengineering in the GeoMIP

Idealized model studies have shown that geo-engineering the Earth’s climate through reduction of incoming solar radiation (also referred to as Solar Radiation Management) may be an option to stabilize global temperatures while greenhouse gas concentrations are increasing. Besides other potential side effects, the response of the hydrological cycle to this approach is still quite uncertain. In this seminar, we present results from 12 CMIP5 models that contributed to the Geoengineering model intercomparison project (GeoMIP). The response of two model experiments with regard to 1850 pre-industrial conditions are contrasted: 1) an abrupt 4xCO2 experiment and 2) an abrupt 4xCO2 experiment with a corresponding reduction of incoming solar radiation to balance the greenhouse gas radiative forcing. Global and regional changes of precipitation and evaporation are discussed, as well as changes in extreme precipitation intensities in both experiments, with focus on monsoonal regions. Uncertainties of the model results will also be discussed based on available precipitation datasets.

About the presenter
Simone Tilmes

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Start date and time: 
Friday, April 26, 2013 - 3:30pm