Fig. 5: Reconstruction of regional paleo-temperature changes (∆MAT) for selected climatic events.
From: A global temperature control of silicate weathering intensity
The comparison between two methods, that are, MAT–CIA relation (this study) and biomarker or pollen records (from literature) are shown here. The events include Holocene Climatic Optimum (HCO), Last Glacial Maximum (LGM), Middle Miocene Climate Optimum (MMCO), Paleocene–Eocene thermal maximum (PETM), and Permian–Triassic boundary (PTB). The symbol color indicates the sampling latitude of sedimentary CIA records: a darker color corresponds to a higher latitude (range: 8–78°). The error bars represent one standard deviation. The relative uncertainty of ∆MAT estimated from paleo-CIA records could even be lower compared to the other method especially in pre-Quaternary events. We note that terrestrial paleo-temperature reconstructed by biomarker/pollen records are scarce and rarely measured at the same location as sediment CIA. Hence, we tried to find synchronous biomarker/pollen records at a latitude similar to the sediment source region. Distributions of ∆MAT derived from both methods are indistinguishable based on a paired t-test (p > 0.05). Detailed information including references on sediment cores and paleo-temperature records is provided in Supplementary Data 3.
