Dana Royer George I. Seney Professor of Geology Department of Earth and Environmental Sciences Wesleyan University Exley Science Center 445 (265 Church St.) Middletown, CT 06459-0139 office phone: 860.685.2836 droyer@wesleyan.edu

Home Research Publications Links

Code, videos, and leaf images Compilation and integration of Phanerozoic CO2 proxies    paleo-co2 website Leaf-gas-exchange proxies for reconstructing paleo-CO2    Franks model    R code and input file to run Franks v2 model for estimating CO2 from stomatal geometry and leaf carbon isotopic composition (data sets S7-S8 in Kowalczyk et al., 2018)    R code and input file to run Franks v1 model for estimating CO2 from stomatal geometry and leaf carbon isotopic composition (in supplement in Franks et al., 2014)    Video tutorial about spreadsheet entry for the Franks CO2 model    R code and input file to combine multiple CO2 estimates from the Franks model (for example, multiple leaves from a single species or multiple species from a single site) (Supplementary material 2 in Zhang et al., 2025)    R code and input files for visualizing the sensitivty of sampling effort when estimating CO2 with the Franks model: number of fields-of-view per leaf; number of leaves per species; number of species per site (Supplementary materials 3-5 in Zhang et al., 2025)    Konrad model    Mathematica and Maple code to run Konrad's v2 model for estimating CO2 from stomatal geometry and leaf carbon isotopic composition (data sets S12-S14 in Kowalczyk et al., 2018)    BRYOCARB model    R code and input file to run Fletcher's BRYOCARB v2 model for estimating CO2 from liverwort leaf carbon isotopic composition (data sets S9-S11 in Kowalczyk et al., 2018) Leaf-gas-exchange proxy for reconstructing paleo-assimilation rate    R code and input file to run the modified Franks model for estimating assimilation rates from stomatal geometry and leaf carbon isotopic composition (data sets XXX in Cham et al., in review) Long-term carbon cycle models    User-friendly interface for GEOCARBSULFvolc long-term carbon cycle model (Torsvik al., 2024)    R code and input files to run Berner's GEOCARBSULFvolc CO2 model (Royer al., 2014) Connecting leaf shape to climate and ecology    Video tutorial for preparing fossil leaves for digital leaf physiognomy (DiLP) analysis    Leaf images for Royer et al. (2008) paper    Leaf images for Huff et al. (2003), Royer et al. (2005), and Peppe et al. (2011) papers