Fig. 5
Distribution of the pre-harmonized to harmonized data for selected water monitoring organizations measuring (a) total nitrogen and (b) total phosphorus. For display, we selected organizations in which our harmonization process impacted both the number of observations and the distribution. We included all raw measurements for either TN or TP that may be harmonized using their metadata. The pre-harmonized distributions included observations measuring total phosphorus, total phosphorus mixed forms, and phosphorus for phosphorus-based nutrients; and nitrogen, nitrogen mixed forms, and total nitrogen mixed forms for nitrogen-based nutrients. Distributions for the harmonized data had fewer observations than those for the pre-harmonized observations because we dropped observations if they could not be harmonized based on metadata.
