Seasonal trends of NH&lt;sup&gt;+&lt;/sup&gt;&lt;sub&gt;4&lt;/sub&gt; and
                        NO&lt;sup&gt;-&lt;/sup&gt;&lt;sub&gt;3&lt;/sub&gt; nitrogen isotope
                        composition in rain collected at Jülich, Germany

Freyer, H. D.

doi:10.3402/tellusa.v30i1.10319

Cited by 136 publications

(170 citation statements)

References 27 publications

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“…However, this isotope effect does not provide an adequate explanation for the observed seasonal changes in d 15 N of NO 3 À at Summit , Ny Å lesund [Heaton et al, 2004], or Bermuda [Hastings et al, 2003]. In fact, recent calculations using this isotope effect and the assumptions made in the Freyer et al [27] Several studies suggest that the d 15 N of NO 3 À most likely reflects the N isotopic composition of NO x sources [Freyer, 1978[Freyer, , 1991Garten, 1996;Russell et al, 1998;Xiao and Liu, 2002;Hastings et al, 2003;Heaton et al, 2004]. The important pre-industrial sources of NO x include biomass burning, biogenic soil emissions, lightning, and stratospheric injection [e.g., Wolff, 1995;Legrand and Kirchner, 1990].…”

Section: No 3 à à à Scavengingmentioning

confidence: 99%

“…The isotopic composition of NO 3 À reflects the sources and chemical processing of atmospheric NO x [Freyer, 1978;Heaton, 1986;Freyer et al, 1993;Russell et al, 1998;Xiao and Liu, 2002;Hastings et al, 2003;Michalski et al, 2003;Heaton et al, 2004]. A recent study of the isotopic composition of NO 3 À in surface snow at Summit, Greenland reveals seasonal variation in both À .…”

Section: Introductionmentioning

confidence: 99%

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Glacial/interglacial changes in the isotopes of nitrate from the Greenland Ice Sheet Project 2 (GISP2) ice core

Hastings¹,

Sigman

Steig

2005

Global Biogeochemical Cycles

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The 15N/14N and 18O/16O ratios of nitrate in the Greenland Ice Sheet Project 2 (GISP2) (Summit, Greenland) ice core are much higher in ice from the last glacial period than in the pre‐industrial Holocene, despite the lack of a significant glacial/interglacial change in nitrate concentration. While both the 15N/14N and 18O/16O records are anticorrelated with snow accumulation rate, neither is satisfactorily explained by accumulation changes or post‐depositional processes. The similarity in the glacial/interglacial change in 15N/14N from several different Greenland ice cores and the large amplitude of this change relative to observed seasonal variation raise the possibility that the isotopes of nitrate in ice cores indicate a large‐scale glacial/interglacial change in the isotopic composition of atmospheric NOx. The glacial/interglacial change in 18O/16O is best explained by a greater contribution of HNO3 production from hydrolysis of N2O5, which has implications for reconstruction of past atmospheric oxidant levels. Although isotope effects associated with NOx photochemistry and nitrate scavenging have not been fully characterized, the 15N/14N data may indicate glacial/interglacial changes in the relative contributions from different natural sources of NOx on a hemispheric or global scale.

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Section: No 3 à à à Scavengingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Glacial/interglacial changes in the isotopes of nitrate from the Greenland Ice Sheet Project 2 (GISP2) ice core

Hastings¹,

Sigman

Steig

2005

Global Biogeochemical Cycles

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“…Also, volatilization of reactive nitrogen compounds from seawater and input from atmospheri c processes occur, but these fl uxes appear to be relatively small. They have been discussed in detail by Hoering (1957) and Freyer (1978).…”

Section: Nitrifying Bacteria Have Been Observed In the Open Waters Ofmentioning

confidence: 99%

Stable isotope geochemistry of nitrogen in marine particulates

Libes¹

1983

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“…Moore (1977) reported δ 15 N values for NH 3 -gas samples, collected close to the emission source in barnyards, of more than 20‰. However, several studies reported higher 15 N enrichment of nitrate in bulk precipitation than the co-existing am- monium (see also a review by Kendall 1998) and this was explained by the washout of 15 N depleted atmospheric NH 3 (Freyer 1978).…”

Section: N Abundance Of Needles and Fine Rootsmentioning

confidence: 99%

Natural abundance of 15N of a spruce forest ecosystem under acid rain and manipulated clean rain field conditions

Sah¹,

Brumme²,

Lamersdorf³

2008

J. For. Sci.

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We analysed stable isotopes of N in a spruce forest under ambient rainfall (no further manipulation of the atmospheric input) and clean rain application (10 years of reduced inorganic N- and acid-constituent input). The objectives of the study were to assess whether or not the natural 15N abundance would function as an indicator for the N-status of our forest ecosystems. For this purpose, natural 15N abundance values were measured in needles, litter fall, roots, soil, bulk precipitation, throughfall and soil water of both plots. In the bulk precipitation and throughfall the δ15N values of NO3-N were in the range reported by other studies (–16 to + 23‰). In both plots, the throughfall was greatly depleted of 15N compared to the bulk precipitation and this was attributed to nitrification in the canopy leaves, leading to δ15N-depleted nitrate production in the leaves that leaches down the soil surface. Nitrate in seepage water showed a general increase in δ15N values when it passes through the upper mineral soil (10 cm soil depth) and infiltrates into deeper mineral soil horizons (100 cm soil depth), similar to the δ15N enrichment of total nitrogen in the mineral soil. We observed 15N depletion in both green needles and litter fall at the clean rain plot, compared to the N-saturated control plot. We assumed it to be due to increased mycorrhizal N-uptake under N limited, i.e. clean rain conditions which are indicated by relatively lower N concentrations of green needles. With respect to the vertical gradient of the 15N abundance in the forest floor, both plots differ from each other, showing an untypical peak of δ15N depletion in the humus layer, which is more pronounced at the control plot. In contrast to the mineral soil where mineralisation is a dominant process for fractionation we attribute the δ15N pattern in the forest floor to additional processes like litter input and immobilisation. We conclude that the δ15N natural abundance analysis is helpful for interpreting the N-status of forest ecosystems but further research is needed especially with respect to the soil-root interface.

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Seasonal trends of NH<sup>+</sup><sub>4</sub> and NO<sup>-</sup><sub>3</sub> nitrogen isotope composition in rain collected at Jülich, Germany

Cited by 136 publications

References 27 publications

Glacial/interglacial changes in the isotopes of nitrate from the Greenland Ice Sheet Project 2 (GISP2) ice core

Glacial/interglacial changes in the isotopes of nitrate from the Greenland Ice Sheet Project 2 (GISP2) ice core

Stable isotope geochemistry of nitrogen in marine particulates

Natural abundance of <sup>15</sup>N of a spruce forest ecosystem under acid rain and manipulated clean rain field conditions

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