Webinar November 2020
Title: Vegetation atmosphere interactions in earth system models.
Speaker: Devaraju Narayanappa, UiO
A link to the pdf presentation by Devaraju Narayanappa is available here, as well as a recording of the Zoom webinar.
I will present results from the idealized large-scale deforestation simulations performed using coupled global climate models. The focus will be on global temperature change and monsoonal rainfall changes.
Increasing human activities altering the land surface at large-scale for agriculture, urbanization, firewood, and timber purposes. Today about 50% of the ice-free land surface is covered by crops or pastures and, in many parts of the world, we continue to expand these areas for food because the world’s population is growing (IPCC-SRCCL 2019). This continued land cover change (LCC) is one of the major drivers of regional and global climate change through altered biophysical (BPH; changes in physical characteristics such as albedo, evapotranspiration, and roughness) and biogeochemical (BGC; changes in atmospheric composition) processes and is increasingly recognized in today's assessments of anthropogenic impacts. In this presentation, I will talk mostly about biophysical effects of deforestation to understand the impact of large perturbations to global land cover. Specifically, if deforested areas are abandoned and forests are allowed to re-grow, will the climate system go back to its natural state? How long will it take for the climate system to reach a new equilibrium in such a case? What determines the time scale? Are there interactions between forests and the atmosphere that gets severely altered for large scale land cover change? Does the monsoon rainfall across the world alters due to large-scale deforestation? I will address these questions in this talk using simulations from Earth system models.