https://doi.org/10.1088/1748-9326/ac69fd
This ERL paper demonstrating the fundamental difference between Fossil Fuel emissions and LULCC was published some months back, but I am not sure it was posted here. *Key message:* FF emissions and LULCC are fundamentally different. Hence, in terms of climate benefits, offsetting FF emissions with afforestation is scientifically flawed. This is textbook stuff but good to demonstrate the concept using a comprehensive Earth system model. https://doi.org/10.1088/1748-9326/ac69fd *Contrasting climate and carbon-cycle consequences of fossil-fueluse versus deforestation disturbance* *Abstract* Carbon dioxide emissions from deforestation disturbance (e.g. clear-cutting, forest fires) are in the same units as carbon dioxide emissions from fossil fuels. However, if the forest is allowed to regrow, there is a large difference between the climate effects of that forest disturbance and the climate effects of fossil CO2. In this study, using a set of idealized global climate-carbon model simulations with equal amounts of CO2 emissions, we show that on century to millennial timescales the response of the climate system to fossil-fuel burning versus deforestation disturbance are vastly different. We performed two 1000-year simulations where we added abrupt emissions of about 600 PgC to the preindustrial state as a consequence of either fossil fuel use or deforestation disturbance with vegetation regrowth. In the fossil fuel simulations, after 1000 years, about 20% of the initial atmospheric CO2 concentration perturbation remains in the atmosphere and the climate is about 1 ◦C warmer compared to the preindustrial state. In contrast, in the case of deforestation with regrowth, after 1000 years, atmospheric CO2 concentration returns close to preindustrial values, because deforested land will typically recover its carbon over the decades and centuries in the absence of further human intervention. These results highlight the differences in the degree of long-term commitment associated with fossil fuel versus deforestation emissions. -- With Best Wishes, ------------------------------------------------------------------- G. Bala Professor Center for Atmospheric and Oceanic Sciences Indian Institute of Science Bangalore - 560 012 India Tel: +91 80 2293 3428; +91 80 2293 2505 Fax: +91 80 2360 0865; +91 80 2293 3425 Email: [email protected]; [email protected] Google Scholar <https://scholar.google.com/citations?user=eurjQPwAAAAJ> ------------------------------------------------------------------- -- 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/CAD7fhVk0VUfUiQfQXD1bQaLf1tRpc-22%3DbkN-v%2B_WgxtcMSbaQ%40mail.gmail.com.
