AN ASSEMBLY OF PRESCRIBED BOUNDARY CONDITIONS FOR THE CLIMATE-MODEL SIMULATIONS ACROSS THE PERMO-TRIASSIC BOUNDARY(PTB)

Past climates are of importance to understand the future evolution of climate. One of the most severe transition of the climate occurred during the transition from the Late Permian to the early Triassic (PT boundary or PTB), potentially linked to massive greenhouse gas emissions due to flood basalt eruption. In this paper, we develop the experimental design for an earth system model to understand the warming across the PTB. We developed boundary conditions for model-model intercomparison including maps of the paleogeography, paleovegetation, paleosoils, river-runoff, and aerosol forcing at 1°x1° resolution. The paleogeographic reconstructions have been a synthesis from previous studies. We updated the map of paleovegetation cover based on previous CCSM4 climate simulations and fossil-based biome reconstructions. The soil-albedo map has been compiled from the modern analogues. The aerosols simulation consistent with our reconstructed topography has been done from the previously implemented Bulk Aerosol Model from the Community Atmosphere Model (CAM4). The proposed boundary conditions will be used to assess the sensitivity of the simulated climate with 4x, 8x and 12x PAL CO₂ radiative forcing to represent a transition into the Triassic hothouse world, as supported by strontium isotopes and oxygen isotopes.