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Dangl, Gabriela; Frey, Claudia; Hassenrück, Christiane; Sabbaghzadeh, Bita; Wäge-Recchioni, Janine; Lehmann, Moritz F; Ley, Martin; Rehder, Gregor; Jürgens, Klaus (2024): Nitrous oxide production rates and stable isotopes in the Benguela Upwelling System during METEOR cruise M157 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.966690

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Abstract:
Upwelling systems are significant sources of atmospheric nitrous oxide (N₂O). The Benguela Upwelling System is one of the most productive regions worldwide and a temporally variable source of N₂O. Strong O₂ depletions above the shelf are favoring periodically OMZ formations. We aimed to assess underlying N₂O production and consumption processes on different temporal and spatial scales during austral winter in the Benguela Upwelling System, when O₂-deficiency in the water column is relatively low. The fieldwork took place during the cruise M157 (August 4th – September 16th 2019) onboard the R/V METEOR. This expedition included four close-coastal regions around Walvis Bay at 23°S, which presented the lowest O₂ concentrations near the seafloor and thus may provide hotspots of N₂O production. Seawater was collected in 10 L free-flow bottles by using a rosette system equipped with conductivity-temperature-depth (CTD) sensors (SBE 911plus, Seabird-electronics, USA).
Incubation experiments were performed using stable isotope ¹⁵N-tracers. Seawater samples for ¹⁵N-tracer incubations and natural abundance N₂O analysis were collected from 10 L free-flow bottles and filled bubble-free into 125 mL serum bottles. The samples for natural abundance N₂O analysis were immediately fixed with saturated HgCl₂ and stored in the dark. To perform the incubation, we added ¹⁵N-labeled NO₂-, NO₃⁻ and NH₄⁺ to estimate the in-situ N₂O production rates and associated reactions. To determine a single rate, the bottles were sacrificed after tracer addition, and within the time interval of 12 h, 24 h and 48 h by adding HgCl₂. Rates were calculated based on a linear regression over time. Total N₂O and natural abundance isotopologues of N₂O were analyzed by using an isotope ratio mass spectrometer (IRMS, Delta V Plus, Thermo Scientific). NO₂- production was additionally analyzed by transforming ¹⁵NO₂- to ¹⁵N₂O following the azide method after McIlvin & Altabet (2005) and the nitrogen isotope ratio of N₂O was measured by an IRMS. N₂ production was determined via an IRMS (Flash-EA-ConfloIV-DELTA V Advanced, Thermo Scientific) by injecting headspace from exetainers. The N₂O yield per nitrite produced and the N₂O yield during denitrification was calculated. Samples for natural abundance N₂O was sampled and measured in triplicates and is shown as an average with standard deviation (SD). In order to estimate the contribution of different N₂O producing pathways by major biological processes and the extent of N₂O reduction to N₂, the dual-isotope mapping approach was applied to natural abundance isotopologues of N₂O, which uses the relative position of background-subtracted N₂O samples in a δ¹⁵Nˢᴾ-N₂O vs. δ¹⁸O-N₂O diagram (Yu et al., 2020; Lewicka-Szczebak et al., 2020).
Keyword(s):
15N-tracer; ammonium oxidation; Benguela Upwelling System; Denitrification; Field observation; N2O production rates; Namibia; nitrate reduction; nitrification; oxygen minimum zone; Stable isotope
Related to:
Dangl, Gabriela; Frey, Claudia; Hassenrück, Christiane; Sabbaghzadeh, Bita; Wäge-Recchioni, Janine; Lehmann, Moritz F; Ley, Martin; Rehder, Gregor; Jürgens, Klaus (2023): 16S amplicon sequences of the microbial communities in the water column of the Northern Benguela Upwelling System. European Nucleotide Archive (ENA), https://www.ebi.ac.uk/ena/browser/view/PRJEB60503
Dangl, Gabriela; Frey, Claudia; Hassenrück, Christiane; Sabbaghzadeh, Bita; Wäge-Recchioni, Janine; Lehmann, Moritz F; Ley, Martin; Rehder, Gregor; Jürgens, Klaus (2023): Inorganic nutrient measurements in the Benguela Upwelling System during METEOR cruise M157. PANGAEA, https://doi.org/10.1594/PANGAEA.956014
Dangl, Gabriela; Frey, Claudia; Hassenrück, Christiane; Sabbaghzadeh, Bita; Wäge-Recchioni, Janine; Lehmann, Moritz F; Ley, Martin; Rehder, Gregor; Jürgens, Klaus (2023): Nitrous oxide measurements in the Benguela Upwelling System during METEOR cruise M157. PANGAEA, https://doi.org/10.1594/PANGAEA.955991
Sabbaghzadeh, Bita; Glockzin, Michael; Rehder, Gregor (2022): Trace gases air daily means during METEOR cruise M157. PANGAEA, https://doi.org/10.1594/PANGAEA.946811
Zabel, Matthias (2020): Short Cruise Report RV METEOR Cruise M157. Expeditionsarchiv FS METEOR, 13, https://www.ldf.uni-hamburg.de/meteor/wochenberichte/wochenberichte-meteor/m156-m159/m157-scr.pdf (m157-scr.pdf)
Original version:
Dangl, Gabriela; Frey, Claudia; Hassenrück, Christiane; Sabbaghzadeh, Bita; Wäge-Recchioni, Janine; Lehmann, Moritz F; Ley, Martin; Rehder, Gregor; Jürgens, Klaus (2023): Nitrous oxide production rates and stable isotopes in the Benguela Upwelling System during METEOR cruise M157. PANGAEA, https://doi.org/10.1594/PANGAEA.956016
References:
Lewicka-Szczebak, Dominika; Lewicki, Maciej Piotr; Well, Reinhard (2020): N2O isotope approaches for source partitioning of N2O production and estimation of N2O reduction – validation with the 15N gas-flux method in laboratory and field studies. Biogeosciences, 17(22), 5513-5537, https://doi.org/10.5194/bg-17-5513-2020
McIlvin, Matthew R; Altabet, Mark A (2005): Chemical Conversion of Nitrate and Nitrite to Nitrous Oxide for Nitrogen and Oxygen Isotopic Analysis in Freshwater and Seawater. Analytical Chemistry, 77(17), 5589-5595, https://doi.org/10.1021/ac050528s
Toyoda, Sakae; Kuroki, Natsuko; Yoshida, Naohiro; Ishijima, Kentaro; Tohjima, Yasunori; Machida, Toshinobu (2013): Decadal time series of tropospheric abundance of N2O isotopomers and isotopologues in the Northern Hemisphere obtained by the long-term observation at Hateruma Island, Japan. Journal of Geophysical Research: Atmospheres, 118(8), 3369-3381, https://doi.org/10.1002/jgrd.50221
Yu, Longfei; Harris, Eliza; Lewicka-Szczebak, Dominika; Barthel, M; Blomberg, Margareta RA; Harris, Stephen J; Johnson, Matthew S; Lehmann, Moritz F; Liisberg, Jesper; Müller, Christoph; Ostrom, Nathaniel E; Six, Johan; Toyoda, Sakae; Yoshida, Naohiro; Mohn, Joachim (2020): What can we learn from N2O isotope data? - Analytics, processes and modelling. Rapid Communications in Mass Spectrometry, 34(20), https://doi.org/10.1002/rcm.8858
Coverage:
Median Latitude: -22.999986 * Median Longitude: 14.224164 * South-bound Latitude: -23.000120 * West-bound Longitude: 14.053270 * North-bound Latitude: -22.999800 * East-bound Longitude: 14.366900
Date/Time Start: 2019-08-24T14:33:00 * Date/Time End: 2019-09-13T10:49:00
Minimum DEPTH, water: 10 m * Maximum DEPTH, water: 127 m
Event(s):
M157_2-9  * Latitude: -22.999800 * Longitude: 14.366900 * Date/Time: 2019-09-13T10:49:00 * Elevation: -46.0 m * Campaign: M157 (BUSUC 1) * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
M157_14-14  * Latitude: -22.999983 * Longitude: 14.053267 * Date/Time: 2019-08-24T14:33:00 * Elevation: -132.0 m * Campaign: M157 (BUSUC 1) * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
M157_16-25  * Latitude: -22.999967 * Longitude: 14.216833 * Date/Time: 2019-09-03T04:16:00 * Elevation: -114.0 m * Campaign: M157 (BUSUC 1) * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 Event labelEventDangl, Gabriela
2 Station labelStationDangl, Gabriela
3 Sample code/labelSample labelDangl, GabrielaSample title used in 16S amplicon sequence data submission
4 DATE/TIMEDate/TimeDangl, GabrielaGeocode
5 LATITUDELatitudeDangl, GabrielaGeocode
6 LONGITUDELongitudeDangl, GabrielaGeocode
7 DEPTH, waterDepth watermDangl, GabrielaGeocode
8 Nitrous oxide productionN2O prodnmol/l/dayDangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plusfrom ammonium, 15N tracer incubations, calculated according to (Trimmer et al. 2016)
9 Nitrous oxide production, standard errorN2O prod std e±Dangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plusfrom ammonium, 15N tracer incubations, calculated according to (Trimmer et al. 2016)
10 Nitrous oxide productionN2O prodnmol/l/dayDangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plusfrom nitrite, 15N tracer incubations, calculated according to Trimmer et al. (2016)
11 Nitrous oxide production, standard errorN2O prod std e±Dangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plusfrom nitrite, 15N tracer incubations, calculated according to Trimmer et al. (2016)
12 Nitrous oxide productionN2O prodnmol/l/dayDangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plusfrom nitrate, 15N tracer incubations, calculated according to Trimmer et al. (2016)
13 Nitrous oxide production, standard errorN2O prod std e±Dangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plusfrom nitrate, 15N tracer incubations, calculated according to Trimmer et al. (2016)
14 Nitrous oxide, limit of detectionN2O LODnmol/l/dayDangl, GabrielaCalculatedfrom ammonium
15 Nitrous oxide, limit of detectionN2O LODnmol/l/dayDangl, GabrielaCalculatedfrom nitrate
16 Nitrous oxide, limit of detectionN2O LODnmol/l/dayDangl, GabrielaCalculatedfrom nitrite
17 Ammonium, oxidation rate[NH4]+ ORnmol/l/dayDangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plus15N tracer incubation, measured as N2O and calculated according to azide method McIlvin & Altabet (2005)
18 Ammonium, oxidation rate, standard error[NH4]+OR std e±Dangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plus15N tracer incubation, measured as N2O and calculated according to azide method McIlvin & Altabet (2005)
19 Nitrate, reduction rate[NO3]- RRnmol/l/dayDangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plus15N tracer incubation, measured as N2O and calculated according to azide method McIlvin & Altabet (2005)
20 Nitrate, reduction rate[NO3]- RRnmol/l/dayDangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plus15N tracer incubation, measured as N2O and calculated according to azide method McIlvin & Altabet (2005)
21 Ammonium, oxidation rate, limit of detection[NH4]+ OR LODnmol/l/dayDangl, GabrielaCalculated
22 Nitrate, reduction rate, limit of detection[NO3]- RR LODnmol/l/dayDangl, GabrielaCalculated
23 Nitrous oxide, yieldN2O yield%Dangl, GabrielaCalculatedfrom ammonium oxidation
24 Nitrous oxide, yieldN2O yield%Dangl, GabrielaCalculatedfrom nitrate reduction
25 Anammox rateAnammox ratenmol/l/dayDangl, GabrielaIsotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Advantage [Conflo IV interface]from ammonium, 15N tracer incubations, measured as N2 and calculated according to Thamdrup et al. (2006)
26 Anammox rate, standard errorAnammox rate std e±Dangl, GabrielaIsotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Advantage [Conflo IV interface]from ammonium, 15N tracer incubations, measured as N2 and calculated according to Thamdrup et al. (2006)
27 Anammox rateAnammox ratenmol/l/dayDangl, GabrielaIsotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Advantage [Conflo IV interface]from nitrate, 15N tracer incubations, measured as N2 and calculated according to Thamdrup et al. (2006)
28 Anammox rate, standard errorAnammox rate std e±Dangl, GabrielaIsotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Advantage [Conflo IV interface]from nitrate, 15N tracer incubations, measured as N2 and calculated according to Thamdrup et al. (2006)
29 Anammox rateAnammox ratenmol/l/dayDangl, GabrielaIsotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Advantage [Conflo IV interface]from nitrite, 15N tracer incubations, measured as N2 and calculated according to Thamdrup et al. (2006)
30 Anammox rate, standard errorAnammox rate std e±Dangl, GabrielaIsotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Advantage [Conflo IV interface]from nitrite, 15N tracer incubations, measured as N2 and calculated according to Thamdrup et al. (2006)
31 DenitrificationDenitrifinmol/l/dayDangl, GabrielaIsotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Advantage [Conflo IV interface]from nitrate, 15N tracer incubations, measured as N2 and calculated according to Thamdrup et al. (2006)
32 Denitrification rate, standard errorDenitrifi std e±Dangl, GabrielaIsotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Advantage [Conflo IV interface]from nitrate, 15N tracer incubations, measured as N2 and calculated according to Thamdrup et al. (2006)
33 DenitrificationDenitrifinmol/l/dayDangl, GabrielaIsotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Advantage [Conflo IV interface]from nitrite, 15N tracer incubations, measured as N2 and calculated according to Thamdrup et al. (2006)
34 Denitrification rate, standard errorDenitrifi std e±Dangl, GabrielaIsotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Advantage [Conflo IV interface]from nitrite, 15N tracer incubations, measured as N2 and calculated according to Thamdrup et al. (2006)
35 Nitrous oxide, yieldN2O yield%Dangl, GabrielaCalculatedfrom denitrification
36 Site preference, N2OSP N2ODangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plusin ‰
37 Site preference, N2O, standard deviationSP N2O std dev±Dangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plus
38 δ18O, nitrous oxideδ18O N2O‰Dangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plus‰ VSMOW
39 δ18O, nitrous oxide, standard deviationδ18O N2O std dev±Dangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plus
40 δ15N, nitrous oxideδ15N N2O‰Dangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plus‰ AIR (bulk)
41 δ15N, nitrous oxide, standard deviationδ15N N2O std dev±Dangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plus
42 δ15N-alpha, nitrous oxideδ15Na N2O‰Dangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plus‰ AIR (α)
43 δ15N-alpha, nitrous oxide, standard deviationδ15Na N2O std dev±Dangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plus
44 δ15Nbeta, nitrous oxideδ15Nb N2O‰Dangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plus‰ AIR (β)
45 δ15Nbeta, nitrous oxide, standard deviationδ15Nb N2O std dev±Dangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plus
46 Site preference, N2OSP N2ODangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plusin ‰; background-subtracted; corrected with present troposphere values: δ15Nbulk-N2O = 6.96 ‰, δ18O-N2O = 44.24 ‰, δ15NSP-N2O = 18.45 ‰; Toyoda et al. (2013); calculated for dual-isotope mapping approach according to Yu et al. (2020) and Lewicka-Szczebak et al. (2020)
47 Site preference, N2O, standard deviationSP N2O std dev±Dangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plusbackground-subtracted; calculated for dual-isotope mapping approach according to Yu et al. (2020) and Lewicka-Szczebak et al. (2020)
48 δ15N, nitrous oxideδ15N N2O‰Dangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plus‰; background-subtracted; corrected with present troposphere values: δ15Nbulk-N2O = 6.96 ‰, δ18O-N2O = 44.24 ‰, δ15NSP-N2O = 18.45 ‰; Toyoda et al. (2013); calculated for dual-isotope mapping approach according to Yu et al. (2020) and Lewicka-Szczebak et al. (2020)
49 δ15N, nitrous oxide, standard deviationδ15N N2O std dev±Dangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plusbackground-subtracted; calculated for dual-isotope mapping approach according to Yu et al. (2020) and Lewicka-Szczebak et al. (2020)
50 δ18O, nitrous oxideδ18O N2O‰Dangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plus‰; background-subtracted; corrected with present troposphere values: δ15Nbulk-N2O = 6.96 ‰, δ18O-N2O = 44.24 ‰, δ15NSP-N2O = 18.45 ‰; Toyoda et al. (2013); calculated for dual-isotope mapping approach according to Yu et al. (2020) and Lewicka-Szczebak et al. (2020)
51 δ18O, nitrous oxide, standard deviationδ18O N2O std dev±Dangl, GabrielaGas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plusbackground-subtracted; calculated for dual-isotope mapping approach according to Yu et al. (2020) and Lewicka-Szczebak et al. (2020)
Change history:
2024-03-18T08:08:21 – Previous version doi:10.1594/PANGAEA.956016 contains errors due to data processing.
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
801 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 
Event		2 
Station		3 
Sample label
(Sample title used in 16S ampl...)		4 
Date/Time		5 
Latitude		6 
Longitude		7 
Depth water [m]		8 
N2O prod [nmol/l/day]
(from ammonium, 15N tracer inc...)		9 
N2O prod std e [±]
(from ammonium, 15N tracer inc...)		10 
N2O prod [nmol/l/day]
(from nitrite, 15N tracer incu...)		11 
N2O prod std e [±]
(from nitrite, 15N tracer incu...)		12 
N2O prod [nmol/l/day]
(from nitrate, 15N tracer incu...)		13 
N2O prod std e [±]
(from nitrate, 15N tracer incu...)		14 
N2O LOD [nmol/l/day]
(from ammonium, Calculated)		15 
N2O LOD [nmol/l/day]
(from nitrate, Calculated)		16 
N2O LOD [nmol/l/day]
(from nitrite, Calculated)		17 
[NH4]+ OR [nmol/l/day]
(15N tracer incubation, measur...)		18 
[NH4]+OR std e [±]
(15N tracer incubation, measur...)		19 
[NO3]- RR [nmol/l/day]
(15N tracer incubation, measur...)		20 
[NO3]- RR [nmol/l/day]
(15N tracer incubation, measur...)		21 
[NH4]+ OR LOD [nmol/l/day]
(Calculated)		22 
[NO3]- RR LOD [nmol/l/day]
(Calculated)		23 
N2O yield [%]
(from ammonium oxidation, Calc...)		24 
N2O yield [%]
(from nitrate reduction, Calcu...)		25 
Anammox rate [nmol/l/day]
(from ammonium, 15N tracer inc...)		26 
Anammox rate std e [±]
(from ammonium, 15N tracer inc...)		27 
Anammox rate [nmol/l/day]
(from nitrate, 15N tracer incu...)		28 
Anammox rate std e [±]
(from nitrate, 15N tracer incu...)		29 
Anammox rate [nmol/l/day]
(from nitrite, 15N tracer incu...)		30 
Anammox rate std e [±]
(from nitrite, 15N tracer incu...)		31 
Denitrifi [nmol/l/day]
(from nitrate, 15N tracer incu...)		32 
Denitrifi std e [±]
(from nitrate, 15N tracer incu...)		33 
Denitrifi [nmol/l/day]
(from nitrite, 15N tracer incu...)		34 
Denitrifi std e [±]
(from nitrite, 15N tracer incu...)		35 
N2O yield [%]
(from denitrification, Calculated)		36 
SP N2O
(in ‰, Gas Chromatograph (GC),...)		37 
SP N2O std dev [±]
(Gas Chromatograph (GC), Manuf...)		38 
δ18O N2O [‰]
(‰ VSMOW, Gas Chromatograph (G...)		39 
δ18O N2O std dev [±]
(Gas Chromatograph (GC), Manuf...)		40 
δ15N N2O [‰]
(‰ AIR (bulk), Gas Chromatogra...)		41 
δ15N N2O std dev [±]
(Gas Chromatograph (GC), Manuf...)		42 
δ15Na N2O [‰]
(‰ AIR (α), Gas Chromatograph ...)		43 
δ15Na N2O std dev [±]
(Gas Chromatograph (GC), Manuf...)		44 
δ15Nb N2O [‰]
(‰ AIR (β), Gas Chromatograph ...)		45 
δ15Nb N2O std dev [±]
(Gas Chromatograph (GC), Manuf...)		46 
SP N2O
(in ‰; background-subtracted; ...)		47 
SP N2O std dev [±]
(background-subtracted; calcul...)		48 
δ15N N2O [‰]
(‰; background-subtracted; cor...)		49 
δ15N N2O std dev [±]
(background-subtracted; calcul...)		50 
δ18O N2O [‰]
(‰; background-subtracted; cor...)		51 
δ18O N2O std dev [±]
(background-subtracted; calcul...)
M157_2-9 N23002EVAR222019-09-13T10:49:00-22.9998014.36690350.3240.0600.1800.0820.0840.0330.1420.0780.192167.4023.028.141.3254.173.100.392.020.000.000.000.000.000.000.000.00100.00015.340.6653.970.302.170.0910.120.25-5.230.4113.601.02-0.520.1459.420.47
M157_2-9N23002EVAR232019-09-13T10:49:00-22.9998014.36690370.1530.0920.0600.0520.1220.0010.2150.0020.12275.1014.298.320.3133.610.730.412.840.000.000.000.000.000.0022.410.53100.00015.692.2257.580.093.080.1511.161.01-4.531.2214.223.411.020.2264.680.14
M157_2-9N23002EVAR242019-09-13T10:49:00-22.9998014.36690400.1120.0100.1130.1120.3670.1120.0240.2640.26459.923.6324.524.918.5311.550.372.910.000.000.000.000.000.000.000.00100.00015.891.1261.000.503.270.2111.440.39-4.450.7514.701.651.550.3168.810.73
M157_17-16 N23005EVAR282019-09-12T19:28:00-23.0001214.31675500.2630.0140.0470.0050.0020.0020.0320.0050.013123.289.958.111.2223.422.880.430.040.000.000.000.000.000.000.000.00100.00016.910.8051.511.251.290.5310.060.11-6.850.9116.251.15-1.140.7654.611.78
M157_17-16N23005EVAR302019-09-12T19:28:00-23.0001214.31675571.5280.9640.0580.0050.0820.0092.2680.0200.011161.047.5010.190.5517.641.301.901.590.000.000.000.00113.3011.2334.768.960.07312.111.1153.520.330.530.016.930.55-5.180.569.591.55-2.030.0157.210.45
M157_17-16N23005EVAR312019-09-12T19:28:00-23.0001214.31675600.1940.0180.0250.0720.0510.0170.0430.0400.169173.2814.4613.271.9334.034.540.220.760.000.000.000.000.000.000.000.00100.00010.380.4453.240.18-0.020.115.530.12-4.850.327.260.61-2.720.1556.710.25
M157_17-16N23005EVAR322019-09-12T19:28:00-23.0001214.31675650.2800.0530.0900.0180.0730.0660.1240.1540.041126.0514.7310.030.4234.650.990.441.440.000.001.000.540.000.000.000.00100.00011.662.9352.241.76-0.670.875.560.65-6.102.299.164.01-3.481.2055.182.41
M157_17-16N23005EVAR342019-09-12T19:28:00-23.0001214.31675700.3050.3530.0000.0580.2500.0700.8300.1650.136158.046.8410.470.5316.091.250.394.550.000.000.000.000.000.000.000.00100.00010.351.2354.240.420.270.275.790.39-4.560.857.411.67-2.160.3657.870.57
M157_16-25 N23010EVAR112019-09-03T04:16:00-22.9999714.21683600.0390.0090.0490.0330.0040.0030.0200.0070.07833.528.403.640.4219.760.980.230.200.000.000.000.002.481.09199.2717.030.000.000.00217.051.2245.820.553.550.7912.300.57-4.751.2416.221.941.531.2546.760.87
M157_16-25N23010EVAR122019-09-03T04:16:00-22.9999714.21683700.1970.0570.0160.0230.0040.0070.1340.0160.05377.278.419.510.9819.792.300.510.081.831.6616.283.781.030.120.000.000.000.00100.00019.471.6550.560.67-2.220.238.010.63-11.461.0320.042.56-7.290.3654.061.04
M157_16-25N23010EVAR132019-09-03T04:16:00-22.9999714.21683800.1450.0720.4660.0770.3900.1980.1690.4660.182131.2739.5743.303.8293.119.000.221.778.650.320.000.004.91-0.99243.9582.4720.346.050.16026.251.9859.083.61-3.171.7610.510.69-15.742.6630.483.05-8.672.7267.135.58
M157_16-25N23010EVAR142019-09-03T04:16:00-22.9999714.216831000.3750.0410.0210.0110.9760.1580.0970.3720.026105.753.3625.947.067.9016.610.717.0014.114.220.000.006.520.990.000.000.000.00100.00020.550.9257.630.55-1.810.398.940.11-11.620.8221.491.32-5.730.5663.610.80
M157_16-25N23010EVAR152019-09-03T04:16:00-22.9999714.216831050.1180.0580.0340.0890.6820.1830.1370.4310.21098.5311.4837.415.0827.0211.960.243.5210.672.063.460.757.530.530.000.000.000.00100.00023.330.1458.900.37-1.310.1710.820.09-12.520.2325.410.20-4.830.2465.140.53
M157_14-14 N230202019-08-24T14:33:00-22.9999814.05327100.0010.0020.0000.0180.0160.0230.0060.0550.0423.090.8916.204.882.0911.490.090.200.000.000.000.00100.00020.320.4247.870.505.660.0416.440.26-3.880.1623.541.133.410.1254.131.35
M157_14-14N230202019-08-24T14:33:00-22.9999814.05327300.0120.0050.0000.0000.0540.0090.0110.0210.00165.1712.935.780.4130.430.970.041.840.000.000.000.000.000.000.000.000.000.00100.00020.581.6044.770.766.150.4416.751.47-3.840.2024.024.174.851.1645.621.98
M157_14-14N230202019-08-24T14:33:00-22.9999814.05327500.0080.0020.0020.0020.1770.0810.0050.1910.00516.563.442.010.268.080.610.0914.960.000.000.000.000.000.000.000.0023.6212.58100.00019.132.0548.670.924.430.1514.341.11-4.790.9420.255.420.280.4055.952.44
M157_14-14N230202019-08-24T14:33:00-22.9999814.05327900.0000.0220.0090.0060.7080.4710.0521.1090.01310.601.756.350.364.120.850.0018.220.000.000.000.000.000.000.000.000.000.00100.00014.991.4944.370.055.700.4113.310.36-1.691.1412.402.624.750.7244.460.09
M157_14-14N230202019-08-24T14:33:00-22.9999814.053271270.1300.0410.0110.0090.1550.3600.0960.8480.021197.9114.8214.241.2334.882.890.132.130.000.006.631.781.200.120.000.000.000.00100.00017.170.7848.200.073.890.0312.680.42-4.490.3616.381.271.980.0450.670.11