Atmospheric C (TAC) is continuously transported by rivers at the continents

surface as soil dissolved and particulate organic C (DOC, POC) and dissolved inorganic C (DIC) used in rock weathering reactions. Global typology of the C export rates (g.m
–2.yr
–1) for 14 river classes from tundra rivers to monsoon rivers is used to calculate global TAC flux to oceans estimated to 542 Tg.yr
–1, of which 37 % is as DOC, 18 % as soil POC and 45 % as DIC. TAC originates mostly from humid tropics (46 %) and temperate forest and grassland (31 %), compared to boreal forest (14 %), savannah and sub-arid regions (5 %), and tundra (4 %). Rivers also carry to oceans 80 Tg. yr
–1 of POC and 137 TG.yr
–1 of DIC originating from rock erosion. Permanent TAC storage on land is estimated to 52 Tg.yr
–1 in lakes and 17 Tg.yr
–1 in internal regions of the continents.