Fig. S8.
Modeling the sensitivity of δ13C to sea level change and the depth of the upper boundary of the OMZ (ZUB) and simulated Early−Middle Triassic perturbations. A, B, and E are equivalent to Fig. 4. (A) Relationship between fanox and ZUB for two scenarios: shallow and deep OMZ. (B) Temporal change in ZUB used in model. (C) Variations in fanox as determined by sensitivity to changes in ZUB. (D) Model output for Fborg. (E) Model output for δ13C. (F−H) Simulated Early to Middle Triassic δ13C perturbations. (F) Temporal fluctuations in ZUB relative to the shelf−slope break (SSB) used in model. We increase λ such that the wavelength of fluctuations in ZUB increases from ∼0.5 My to ∼3 My time scales, and with a deeper OMZ after 5 My. (G) Variations in fanox as determined by sensitivity to changes in ZUB. (H) Model output for δ13C.