Colors indicate the projected absolute change in alkalinity flux of catchments per temperature band for the historical temperature range of 0.0-20.0 C, globally (corresponds to a land surface area of 44,506,993 km 2 ), under scenario SSP5-8.5. The mean change in mean annual temperature (ΔMAT) under SSP5-8.5 (SSP: shared socioeconomic pathway) until the year 2100 is projected to be 3.8 C. Catchment areas in white were excluded from the analysis, since their historical MATs were lower or higher than the temperature range of 0.0-20.0 C. For the calculation of the absolute alkalinity flux as specific mass flux, a molar mass of 61.02 g mol -1 for bicarbonate (HCO 3 ) was used, as at pH 7-9, the alkalinity concentration is approximately equal to the bicarbonate concentration 45 , 46 . The background map with the continent outlines is from naturalearthdata.com 69 .
