Paul J. Valdes

TL;DR: A global–scale analysis of the impact of the late Carboniferous climate and atmospheric composition on vegetation function was determined by driving a process–based vegetation–biogeochemistry model with a carboniferous global palaeoclimate simulated by the Universities Global Atmospheric Modelling Programme General Circulation Model.

TL;DR: This paper performs more than 100 simulations with perturbed physics parameters, and identifies two simulations that have an optimal fit with the proxy data, and simulated the warmth of the Early Eocene at 560 ppmv CO2, which is a much lower CO2 level than many other models.

TL;DR: In this article, the authors used Earth-system model simulations and comparison of marine-based radiocarbon records from different ocean basins to demonstrate that the Younger Dryas (YD) Δ14Catm increase is smaller than suggested by the marine archive.

TL;DR: The late arrival of early hominins into Europe, as deduced from the fossil record, is shown to be consistent with poor ability of these hominINS to survive in the Eurasian landscape.

TL;DR: In this paper, a new off-line dust model is described, which can be forced by output from the Hadley Centre general circulation model (GCM) or by ERA analyses, and discusses an extensive set of quantitative and qualitative evaluations with DIRTMAP deposition data, University of Miami concentration data, and Total Ozone Mapping Spectrometer (TOMS) aerosol index.