Dataset: ETSP 2013 NO3 NO2 N2O
Deployment: NBP1305

Nitrate, nitrite, and nitrous oxide isotope measurements from the Eastern Tropical South Pacific ocean (NBP13-05)

Principal Investigator:

Karen L. Casciotti (Stanford University)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Biogeochemistry of nitrous oxide cycling in the eastern tropical South Pacific (N2O Cycling)

Current State:

Final no updates expected

Data URL:

https://www.bco-dmo.org/dataset-deployment/744812/data

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Description

Nitrate, nitrite, and nitrous oxide isotope measurements from the Eastern Tropical South Pacific ocean (NBP13-05). The data in this dataset were published in Peters et al. (2018) and Casciotti et al. (2018).

Methods & Sampling

Dataset acquisition description

Samples were collected from a standard Niskin bottle rosette.

Nitrate isotope analyses were conducted by denitrifier method (Sigman et al., 2001; Casciotti et al., 2002) with updates (McIlviin and Casciotti, 2011). Nitrite was removed from samples containing more than 0.1 uM nitrite, using sulfuric acid (Granger and Sigman, 2009). Standards include USGS32, USGS34, and USGS35.

Nitrite isotope analyses were conducted by azide method (McIlvin and Altabet, 2005). Standards include N23, N7373, and N10219.

Nitrous oxide isotope analyses were conducted as described in McIlvin and Casciotti, 2010. N2O isotope measurements were calibrated against a laboratory N2O working gas.

The water mass analysis for the oxygen deficient zone waters was conducted as described in Peters et al., 2018, Deep Sea Research II, Estimating fixed nitrogen loss and associated isotope effects using concentration and isotope measurements of NO3-, NO2-, and N2 from the Eastern Tropical South Pacific oxygen deficient zone.

Data Processing Description

Dataset Processing Description

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1140404	NSF Division of Ocean Sciences
OCE-1233339	NSF Division of Ocean Sciences

Instruments

Isotope-ratio Mass Spectrometer

Supplied Name: ThermoFinnigan DeltaPLUS XP

Supplied Description:

All isotopic measurements were made on a ThermoFinnigan DeltaPLUS XP isotope ratio mass spectrometer.

Instrument Type

Generic Name: Isotope-ratio Mass Spectrometer

Acronym: IR Mass Spec; IRMS

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB16/

Generic Description:

The Isotope-ratio Mass Spectrometer is a particular type of mass spectrometer used to measure the relative abundance of isotopes in a given sample (e.g. VG Prism II Isotope Ratio Mass-Spectrometer).

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
CTD_cast	cast identifier from cruise	unitless	cast
STN	station identifier from cruise	unitless	station
date	date; formatted as yyyy-mm-dd	unitless	date
DEPTH	sample depth	meters	depth
PRESSURE	pressure	decibars	press
latitude	latitude of sampling	degrees North	lat
longitude	longitude of sampling	degrees East	lon
TEMPERATURE	temperature	degrees C	temp
SALINITY	salinity	PSU	sal
SIGMA_THETA	sigma-theta	kg/m3	sigma_theta
SBE_OXYGEN	oxygen measured by SBE	umol/kg	O2
O2_SAT_mL_L	oxygen saturation in milliters per liter	ml/L	O2sat
O2_SAT_umol_kg	oxygen saturation in micromoles per kilogram	umol/kg	O2sat
AOU	apparent oxygen utilization	umol/kg	AOU
NO3_sample_IDs	internal reference number for sample	unitless	sample
sulfamic_treated	An asterisk indicates a sample was treated with sulfamic acid to remove nitrite prior to nitrate isotopic analysis	unitless	treatment
d15N_NO3	delta 15N of nitrate	per mil vs. N2	dN15_NO3
d15N_NO3_sd	standard deviation of d15N_NO3	per mil	dN15_NO3
d18O_NO3	delta 18O of nitrate	per mil vs. VSMOW	d18O_NO3
d18O_NO3_sd	standard deviation of d18O_NO3	per mil	d18O_NO3
d15N_NO2	delta 15N of nitrite	per mil vs. N2	no_bcodmo_term
d15N_NO2_sd	standard deviation of d15N_NO2	per mil	no_bcodmo_term
d18O_NO2	d18O of nitrite	per mil vs. VSMOW	no_bcodmo_term
d18O_NO2_sd	standard deviation of d18O_NO2	per mil	no_bcodmo_term
N2O_sample_ID_1	internal reference number for sample (replicate 1 of 2)	unitless	sample
N2O_sample_ID_2	internal reference number for sample (replicate 2 of 2)	unitless	sample
N2O_conc	N2O concentration	nM	N2O
N2O_conc_sd	standard deviation of N2O_conc	nM	N2O
N2O_SP	N2O site preference	per mil	N2O
N2O_SP_sd	standard deviation of N2O_SP	per mil	N2O
d15N_N2O	delta 15N of N2O	per mil vs. N2	no_bcodmo_term
d15N_N2O_sd	standard deviation of d15N_N2O	per mil	no_bcodmo_term
d18O_N2O	delta 18O of N2O	per mil vs. VSMOW	no_bcodmo_term
d18O_N2O_sd	standard deviation of d18O_N2O	per mil	no_bcodmo_term
d15Na	delta 15N of N2O-alpha	per mil vs. N2	d15N
d15Na_sd	standard deviation of d15Na	per mil	d15N
d15Nb	delta 15N of N2O-beta	per mil vs. N2	d15N
d15Nb_sd	standard deviation of d15Nb	per mil	d15N
Kelvin	Temperature in Kelvin	K	no_bcodmo_term
ln_Ko	natural logarithm of Ko, the solubility of N2O in seawater as per Weiss and Price, 1980	unitless	no_bcodmo_term
Ko	solubility of N2O in seawater, as per Weiss and Price, 1980	mol N2O/kg/atm	no_bcodmo_term
N2O_sat_mol_kg	concentration of N2O at equilibrium with atmosphere at in situ temperature and salinity	mol N2O/kg	no_bcodmo_term
N2O_sat_nmol_L	concentration of N2O at equilibrium with atmosphere at in situ temperature and salinity, converted to nmol/L	nmol N2O/L	no_bcodmo_term
delta_N2O	N2O supersaturation, deltaN2O = [N2O]obs - [N2O]sat	nmol N2O/L	no_bcodmo_term
ESPIW	% Eastern South Pacific Intermediate Water, as per Peters et al., 2018 Deep Sea Research II	%	no_bcodmo_term
ESSW	% Equatorial Subsurface Water, as per Peters et al., 2018 Deep Sea Research II	%	no_bcodmo_term

Database

Contribute Data

Dataset: ETSP 2013 NO3 NO2 N2O
Deployment: NBP1305

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: ETSP 2013 NO3 NO2 N2ODeployment: NBP1305

Dataset acquisition description

Dataset Processing Description

Dataset: ETSP 2013 NO3 NO2 N2O
Deployment: NBP1305