Isotopic fractionation of dissolved nitrate during denitrification in the eastern tropical north pacific ocean

Cline, J. D.; Kaplan, I. R.

doi:10.1016/0304-4203(75)90009-2

Cited by 432 publications

(253 citation statements)

References 21 publications

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“…The samples (Tables 1 and 2) were preserved by adding either 1 ml of saturated HgCl* or 4 ml of concentrated HCl solution to each liter of water. The waters were analyzed for nitrogen isotopic composition of nitrate (including nitrite) at UCLA, following the method of Cline and Kaplan (1975).…”

Section: Methodsmentioning

confidence: 99%

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The eastern tropical Pacific as a source of 15N‐enriched nitrate in seawater off southern California

Liu

Kaplan

1989

Limnology & Oceanography

331

196

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Dissolved nitrate in the subsurface water (200-650 m) off southern California is unusually high in 615N compared with waters from the same depth in the central and western Pacific, which have 6r5N values similar to the deep oceans. Marc than 150 seawater samples from the sea off southern California and the North Atlantic were analyzed for the 615N of nitrate. The mean 615N (& 1 SD) of deep waters (> 1,500 m) is 5.7 40.7%. The mean iY5N in the "N-anomaly zone off southern California is 9.0*0.7%~. Maxima of 615N were found to coincide with salinity maxima, which occurred in the same isopycnal levels as the 15N-enriched denitrifying zone in the eastern tropical North Pacific (ETNP). Using the correlation between ti15N and salinity, we can show the southern California waters to be of mixed origin with the denitrifying water from the ETNP as one end member. Our observations support the notion that the oxygen-deficient waters in the eastern tropical Pacific arc important sources of 15N-enriched nitrate. Sweeney et al. (1978) studied the isotopic composition of particulate organic matter (POM) in sediments from the southern California borderland and showed that the avcrage 615N of marine organic nitrogen was higher than that of terrigenous organic nitrogen by 7%~. Wada et al. (1975) suggested that the high 615N of nitrogenous compounds in the sea, and in planktonic proteins, is mainly attributable to the isotopic composition of nitrate in seawater, which is enriched in 15N due to preferential removal of 14N03-during denitrification. Saino and Hattori (1987) reported geographic variation of the 615N value of POM and attributed the difference primarily to isotopic altcration in nitrate. This paper demonstrates geographic inhomogeneity in the nitrogen isotopic composition of nitrate and offers some explanations for the variation. The ' Present address: Inst. Earth Sci.,

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Section: Methodsmentioning

confidence: 99%

“…Wada et al (1975) obtained a mean 615Nvalue(+ 1 SD)fornitratcof5.8+1.60/00 folr 18 seawater samples. Cline and Kaplan (1975) observed a large enrichment of 15N in nitrate (with 615N up to 19%0) …”

mentioning

confidence: 93%

The eastern tropical Pacific as a source of 15N‐enriched nitrate in seawater off southern California

Liu

Kaplan

1989

Limnology & Oceanography

331

196

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“…6c). In this case, water-column denitrification and anammox would have resulted in a positive fractionation and a 15 N-enriched nitrate pool (Cline and Kaplan, 1975;Liu and Kaplan, 1988) (Fig. 6c).…”

Section: Early Cambrian Stagementioning

confidence: 98%

Marine redox variations and nitrogen cycle of the early Cambrian southern margin of the Yangtze Platform, South China: Evidence from nitrogen and organic carbon isotopes

Wang

Struck

Guo

et al. 2015

Precambrian Research

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“…Many wastewater treatment plants employ microbial processing to remove nitrogen at rates higher than in natural ecosystems. Microbial nitrogen removal processes, particularly denitrification, favor the isotopically light 14 N and enrich the remaining nitrate pool with 15 N (Cline and Kaplan 1975;Kendall 1998). Additionally, ammonia from human and animal waste fractionates during volatilization, leaving the non-volatile portion further enriched with 15 N (McClelland andValiela 1998, Fry 2006).…”

mentioning

confidence: 99%

Oyster and Macroalgae Bioindicators Detect Elevated δ15N in Maryland’s Coastal Bays

Fertig

Carruthers

Dennison

et al. 2009

Estuaries and Coasts

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Nitrogen loading from anthropogenic sources, including fertilizer, manure, and sewage effluents, has been linked with declining water quality in coastal lagoons worldwide. Freshwater inputs to mid-Atlantic coastal lagoons of the USA are from terrestrially influenced sources: groundwater and overland flow via streams and agricultural ditches, with occasional precipitation events. Stable nitrogen isotopes ratios (δ 15 N) in bioindicator species combined with conventional water quality monitoring were used to assess nitrogen sources and provide insights into their origins. Water quality data revealed that nutrients derived from terrestrial sources increased after precipitation events. Tissues from two bioindicator species, a macroalgae (Gracilaria sp.) and the eastern oyster (Crassostrea virginica) were analyzed for δ 15 N to determine spatial and temporal patterns of nitrogen sources.

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Isotopic fractionation of dissolved nitrate during denitrification in the eastern tropical north pacific ocean

Cited by 432 publications

References 21 publications

The eastern tropical Pacific as a source of 15N‐enriched nitrate in seawater off southern California

The eastern tropical Pacific as a source of 15N‐enriched nitrate in seawater off southern California

Marine redox variations and nitrogen cycle of the early Cambrian southern margin of the Yangtze Platform, South China: Evidence from nitrogen and organic carbon isotopes

Oyster and Macroalgae Bioindicators Detect Elevated δ15N in Maryland’s Coastal Bays

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