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https://jyx.jyu.fi/handle/123456789/89061 <https://jyx.jyu.fi/handle/123456789/89061#> *Authors* Miettinen, Liisa *28 August 2023* *Abstract* The thesis examines a standard and seasonal climate modification strategy based on sulfur injections in the upper atmosphere. In the standard strategy, sulfur is continuously sent to the equator, and in the variable strategy, the location of the sulfur injections varies according to the season. Injection scenarios are simulated using the EC-Earth3 climate model, and the SALSA and M7 aerosol modules, where the amount of sent sulfur varies between 2 and 100 Tg(S)yr−1. In addition to these, the ability of both strategies to compensate for the warming caused by the atmospheric carbon dioxide concentration will be investigated. The strategy varying according to the season caused a stronger radiative forcing and a smaller change in precipitation when the injection amount was less than 10 Tg(S)yr−1. The majority of the particle fields simulated with the SALSA aerosol module produced stronger radiative forcings compared to the M7 simulations. There were no clear differences in precipitation related to the aerosol module. With injection amounts below 20 Tg(S)yr−1, both inject tion strategy was equally effective with the SALSA aerosol module, but the fluctuating strategy was more effective with the M7 aerosol module in the simulated aerosol fields. <https://jyx.jyu.fi/handle/123456789/89061#> <https://jyx.jyu.fi/handle/123456789/89061#> Constant and varying injection strategies for stratospheric aerosol intervention with sulfur are compared in terms of radiative forcing and fast precipitation response. Sulfur is injected continuously at the equator in the constant strategy while the injection area is varied spatially and temporally in the varying strategy. Injection magnitudes between 2 - 100 Tg(S)yr−1 are simulated with EC-Earth3 using aerosol modules M7 and SALSA. CO2 compensation capacities of both strategies are also considered. The varying strategy was found to produce a stronger radiative forcing and smaller precipitation due to the fast precipitation response compared to the constant strategy above 10 Tg(S)yr−1 injection rates. Aerosol fields simulated with SALSA produced stronger radiative forcing compared to M7 in majority of the scenarios, however no clear trend was observed in fast precipitation response in terms of aerosol module. CO2 compensation capacities of both injection strategies were similar for simulations using SALSA below 20 Tg(S)yr−1 injection rates, however the varying strategy was more effective than the constant strategy in simulations using aerosol fields simulated with M7. *Source: University of Jyvaskyla* -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/geoengineering/CAHJsh9-mysPf%2B33uxoiUSNzZFpXkAhTvWqGuE6E11jdX9VzqKA%40mail.gmail.com.
