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Fig. 7 | Progress in Earth and Planetary Science

Fig. 7

From: Nitrogen dynamics in a highly urbanized coastal area of western Japan: impact of sewage-derived loads

Fig. 7

Spatial variation in a PON concentrations and b δ15N values for NO3, PON, and surface sediment on the KH line. The values for PON were measured in October 2014 and during the rising tide period in September 2016. The δ15N values for NO3 and sediment were measured in October 2014. The average δ15N(NO3) for TSE, river water, offshore seawater, and pore water from 2013, 2013 and 2014, 2014, and 2013, respectively, served as reference values

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