Deforestation changes land–atmosphere interactions across South American biomes

Abstract

South American biomes are increasingly affected by land use/land cover change. However, the climatic impacts of this phenomenon are still not well understood. In this paper, we model vegetation–climate interactions with a focus on four main biomes distributed in four key regions: The Atlantic Forest , the Cerrado , the Dry Chaco, and the Chilean Matorral ecosystems. We applied a three member ensemble climate model simulation for the period 1981–2010 (30 years) at 25 km resolution over the focus regions to quantify the changes in the regional climate resulting from historical deforestation . The results of computed modelling experiments show significant changes in surface fluxes , temperature and moisture in all regions. For instance, simulated temperature changes were stronger in the Cerrado and the Chilean Matorral with an increase of between 0.7 and 1.4 °C. Changes in the hydrological cycle revealed high regional variability. The results showed consistent significant decreases in relative humidity and soil moisture, and increases in potential evapotranspiration across biomes, yet without conclusive changes in precipitation. These impacts were more significant during the dry season , which resulted to be drier and warmer after deforestation . • Modelling study of the climatic impacts of deforestation across South American biomes • Significant increase in surface temperature between 0.7 and 1.4 °C • Dry season is drier and warmer after deforestation in all biomes. • Deforestation significantly changes land-atmosphere interactions.