Impact of land use and deforestation on biogenic hydrocarbons emissions in a global vegetation model
Continental biosphere is a major source of Non Methane Hydrocarbons (NMHCs) such as isoprene, monoterpenes and many other reactive species. NMHCs play a crucial role in tropospheric chemistry and affect the concentrations and budget of ozone, carbon monoxide and radicals on a regional and even global scale. In this study, a biogenic emission scheme has been integrated into the global terrestrial biosphere model ORCHIDEE (Organizing Carbon and Hydrology in Dynamic EcosystEms) in order to calculate biogenic fluxes interactively with meteorological and surface conditions. Biogenic emissions of isoprene and monoterpenes in our model are estimated to 565 TgC/yr and 92 TgC/yr respectively. The results are compared to previous estimates and available field measurements in order to evaluate the emission model. Contribution of various continents or regions are investigated and the diurnal cycle variability is illustrated. The impact of land use and deforestation on biogenic emissions is presented based on various sensitivity studies and scenarios of global vegetation changes. The influence of biogenic emissions on tropospheric chemistry and especially on ozone, carbon monoxide and radicals is then investigated using the LMDz-INCA climate-chemistry model.
EGS - AGU - EUG Joint Assembly
- Pub Date:
- April 2003