The influence of vegetation, fire spread and fire behaviour on biomass burning and trace gas emissions: results from a process-based model

[摘要] A process-based fire regime model (SPITFIRE) has been developed, coupledwith ecosystem dynamics in the LPJ Dynamic Global Vegetation Model, and usedto explore fire regimes and the current impact of fire on the terrestrialcarbon cycle and associated emissions of trace atmospheric constituents. Themodel estimates an average release of 2.24 Pg C yr⁻¹ as CO₂ frombiomass burning during the 1980s and 1990s. Comparison with observed activefire counts shows that the model reproduces where fire occurs and can mimicbroad geographic patterns in the peak fire season, although the predictedpeak is 1–2 months late in some regions. Modelled fire season length isgenerally overestimated by about one month, but shows a realistic pattern ofdifferences among biomes. Comparisons with remotely sensed burnt-areaproducts indicate that the model reproduces broad geographic patterns ofannual fractional burnt area over most regions, including the boreal forest,although interannual variability in the boreal zone is underestimated.

[学科分类] 地球化学与岩石