Fig. 1: Geographical distribution of δ15N and δ18O data for nitrate in river water and groundwater by number (#) of measurements by 0.1° latitude and year of sample collection. | Communications Earth & Environment

Fig. 1: Geographical distribution of δ15N and δ18O data for nitrate in river water and groundwater by number (#) of measurements by 0.1° latitude and year of sample collection.

From: Global patterns of nitrate isotope composition in rivers and adjacent aquifers reveal reactive nitrogen cascading

Fig. 1

The size of each circle corresponds to the concentration of NO3-N in mg L−1. The light and dark gray bars indicate the data were retrieved from literature or the IAEA Coordinated Research Project (CRP), respectively. Most data were from 30° N and 60° N LAT and between 2010 and 2013.

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