Fig. 2: Error propagation of the mechanistic pCO2 proxy applied to Givetian Drepanophycus sp. from the Hamilton Group, NY, USA. | Nature Communications

Fig. 2: Error propagation of the mechanistic pCO2 proxy applied to Givetian Drepanophycus sp. from the Hamilton Group, NY, USA.

From: Low atmospheric CO2 levels before the rise of forested ecosystems

Fig. 2

Probability distributions for model input parameters (Δleaf, SD, p; upper row) are sampled (N = 10,000) to calculate model parameters (middle row: stomata area, amax, the maximal conductance at full daylight, gc,max, and ratio of CO2 concentration in the substomatal cavities to atmospheric CO2, ci/ca;) and posterior probability distributions for the model output parameters (lower row: atmospheric CO2, ca, CO2 assimilation rate An, and total conductance, gc,tot). Numerical solutions were obtained using Matlab’s fsolve function (see details in supplementary information). The initial guess output parameters are marked with red triangles, and the results do not depend on the initial guess. The median values and errors represented by 1st and 3rd quartiles are reported above each panel for the calculated properties.

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