Fig. 4: Control of temperature versus precipitation on CIA.
From: A global temperature control of silicate weathering intensity
a, b Boxplots of CIA grouped by zones of MAT (a, interval of 2 °C) and MAP (b, interval of 0.2 m/yr). The notch of each box displays the variability of the median: if the notches of both boxes do not overlap, their medians are significantly different at the 5% level. The box limits are 25th and 75th percentiles, the whiskers represent the 1.5× interquartile range, and the “+” symbols are outliers. CIA increases monotonically with MAT and shows a more complicated pattern with MAP. The patterns of WIP (Supplementary Fig. 3) are similar to those of CIA shown here. c Empirical relationship between MAT and percentage of feldspar dissolved (fdiss, %) converted from average sediment CIA (Methods) binned by temperature (an interval of 2 °C, MAT >0 °C, Supplementary Fig. 6). The non-negligible fdiss under low MAT (~0 °C) might be partly contributed by sedimentary rock outcrops that have been weathered before exposure. However, the impact of such fdiss baseline in a specific region can be largely reduced when calculating relative changes of fdiss with MAT.
