Dataset: ETSP N2O
Deployment: AT15-61

ETSP Nitrous oxide (N2O) concentration data and associated physicochemical parameters from the CTD sensor package

View Data: For data, See Dataset Metadata Page: https://www.bco-dmo.org/dataset/821268

Principal Investigator:

Karen L. Casciotti (Woods Hole Oceanographic Institution, WHOI)

Contact:

Alyson E. Santoro (Woods Hole Oceanographic Institution, WHOI)

BCO-DMO Data Manager:

Dana Stuart Gerlach (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Expression of Microbial Nitrification in the Stable Isotopic Systematics of Oceanic Nitrite and Nitrate (Microbial Nitrification)

Version:

Deployment Synonyms:

ETSP2010

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Description

This data was published as Figure 5 in Santoro et al. (2020)

Acquisition Description

Dataset acquisition description

Seawater samples were obtained during the R/V Atlantis (AT15-61) and R/V Melville (MV1104) cruises in Jan-Feb 2010 and Mar-Apr 2011. Water samples were collected at discrete depths using Niskin bottle type rosette samplers equipped with either 24 bottles (10L) or 12 bottles (20L), and an SBE9plus conductivity-temperature-depth (CTD) sensor package (SeaBird Electronics, Bellevue, WA). This dataset's samples were collected from Niskin bottles into 160 mL glass serum vials, killed with saturated mercuric chloride, and crimp sealed with gray butyl stoppers. Prior to sealing, ~1 mL of sample was removed to allow room for sample expansion and to prevent the sample vessel from shattering upon warming.

Processing Description

Dataset Processing Description

Sample processing:

Nitrous oxide (N2O) concentration measurements were performed on a Thermo Delta Plus XP isotope ratio mass spectrometer using a custom-built automated purge and trap system (McIlvin and Casciotti, 2010). Dissolved N2O concentrations were determined by comparison of mass/charge (m/z) = 44 peak area against analyses of known amounts of N2O (1-10 nmol) and the volume of sample analyzed (153.8 ± 0.5 mL).

Data processing:

CTD sensor data were processed using Seabird Electronics (SBE) Data Processing software using SBE recommended parameters, including the tau oxygen correction and oxygen hysteresis correction. Processing commands were applied in the following order: filter, alignctd, celltm, loopedit, wildedit.
Derived parameters (pottemp, aou, sigma_theta) were calculated in MATLAB using the CSIRO SEAWATER function library for MATLAB, ver 3.3 (22-Sept-2010).

BCO-DMO processing:

Added a conventional header with dataset name, PI name, version date.
Adjusted parameter names to comply with database requirements.
Combined year, month, day fields and adjusted timezone to create ISO date field.
Units in parentheses removed and added to Parameter Description metadata section.
Missing data identifier of 'NaN' replaced with 'nd' ('nd' is BCO-DMO system default missing data identifier).

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-0961098	NSF Division of Ocean Sciences

Instruments

Isotope-ratio Mass Spectrometer

Supplied Name: Thermo Delta Plus XP isotope ratio mass spectrometer

Supplied Description:

Thermo Delta Plus XP isotope ratio mass spectrometer is specially designed for measurement of light environmental stable isotopes (2H, 13C, 15N, 18O, 34S) and is a sensitive and selective instrument with applications in hydrology, geology, environmental protection, paleoclimate.

Instrument Type

Generic Name: Isotope-ratio Mass Spectrometer

Acronym: IR Mass Spec

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
ISO_Date_Local	Date of sampling in ISO format (yyyy-mm-dd). Timezone was GMT-5 in 2010, GMT-4 in 2011	unitless	date_local
Year	Deployment year	unitless	date
Month	Deployment month (local)	unitless	date
Day	Deployment day (local)	unitless	date
Latitude	Latitude of sample collection, South is negative	decimal degrees	lat
Longitude	Longitude of sample collection, West is negative	decimal degrees	lon
Station	Station Number	unitless	station
Cast	Cast Number	unitless	cast
Depth	Sample collection depth	meters	depth
Salinity	Salinity	practical salinity units (psu)	sal
Temperature	Temperature	degrees Celsius	temp
Density	Seawater density	kilograms per cubic meter (kg/m^3)	density
Oxygen	Dissolved oxygen	micromoles per kilogram (umol/kg)	O2
Pressure	Pressure	decibars	press
Potential_Temp	Potential Temperature	degrees Celsius	potemp
AOU	Apparent oxygen utilization	micromoles per kilogram (umol/kg)	AOU
sigma_theta	sigma-theta, Potential density anomaly	kilograms per cubic meter (kg/m^3)	sigma_0
sigma_T	sigma-T, Density anomaly	kilograms per cubic meter (kg/m^3)	sigma_t
N2O	Nitrous oxide concentration	micromoles per liter (umol/L)	N2O

Database

Geospatial Access

Contribute Data

Dataset: ETSP N2O
Deployment: AT15-61

Dataset acquisition description

Dataset Processing Description

Database

Geospatial Access

Contribute Data

Dataset: ETSP N2ODeployment: AT15-61

Dataset acquisition description

Dataset Processing Description

Dataset: ETSP N2O
Deployment: AT15-61