Table 1 Sampling date, water discharge (m3 s−1), nitrate concentration (µM), particulate nitrogen (PN; %), water 15N-NO3−, δ18O-NO3−, particle δ15N (δ15N-PN), and δ15N of total N (δ15N-TN)

From: Isotopic evidence for preferential transport of fertilizer nitrogen into the northern Gulf of Mexico during high water discharge

Date

Discharge

NO3−

PN

δ15N-NO3−

δ18O-NO3−

δ15N-PN

δ15N-TN

(m3 s−1)

(µM)

(%)

(‰)

(‰)

(‰)

(‰)

2021/03/24–2021/03/31

1683

61.5 ± 9

0.21 ± 0.1

6.5 ± 0.3

2.2 ± 0.3

6.1 ± 0.9

6.4 ± 0.4

2021/08/17–2021/08/24

737

38.8 ± 5

0.43 ± 0.1

9 ± 0.3

3.1 ± 0.3

9.8 ± 1

9.2 ± 0.2

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