Extended Data Fig. 2: Spatial and monthly DOC sampling density.
From: Biological carbon pump estimate based on multidecadal hydrographic data
a, Spatial DOC sampling density. b,c, Monthly DOC sampling density. The DOC observations, obtained from a recent compilation16, are interpolated to the OCIM grid. The colour denotes the fraction of the grid boxes in each water column with at least one measurement. For each water column, the sampling density is defined as the total number of grid boxes with at least one sample divided by the total number of wet grid boxes.
