Impact of geoengineering schemes on the global hydrological cycle

摘要: The rapidly rising CO2 level in the atmosphere has led to proposals of climate stabilization by ‘‘geoengineering’’ schemes that would mitigate change intentionally reducing solar radiation incident on Earth’s surface. In this article we address impact these global hydrological cycle. By using equilibrium simulations, show insolation reductions sufficient offset global-scale temperature increases lead a decrease mean precipitation. This occurs because forcing is more effective driving changes evaporation than similar magnitude. model used here, sensitivity, defined as percentage precipitation per degree warming, 2.4% K 1 for forcing, but only 1.5% forcing. Although other models and system itself may differ quantitatively from result, conclusion can be understood based simple considerations surface energy budget thus likely robust. For same change, result relatively larger net radiative fluxes at surface; are compensated sum latent sensible heat fluxes. Hence, cycle sensitive adjustment greenhouse gases. implies an alteration might or could not cancel both once. hydrology mitigation