Dataset: Southern Ocean particulate organic N isotopes
Deployment: VOY016

Bulk suspended PON d15N from the region south of African sector

Principal Investigator:

Contact:

Sandi M. Smart (Stellenbosch University)

BCO-DMO Data Manager:

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

Project:

High-resolution, Assemblage-specific Records of Diatom-bound N Isotopes from the Indian Sector of the Antarctic Ocean (Diatom-bound_N_Isotopes)

MRI: Acquisition of Stable Isotope Instrumentation for the Biogeosciences at Princeton University (stable isotope instrumentation)

Understanding the nitrogen isotopes of planktonic foraminifera: A modern Sargasso Sea study (N Isotopes Foraminifera)

Current State:

Final no updates expected

Data URL:

https://www.bco-dmo.org/dataset-deployment/805459/data

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Description

Compilation of surface measurements of bulk suspended particulate organic nitrogen (PON) collected from the Southern Ocean south of Africa (spanning 0-42°E). Date, time, latitude, and longitude are the averages of the start and end values of each underway collection.

Methods & Sampling

Dataset acquisition description

Bulk (>0.3 um) suspended PON samples were collected from the underway intake (at 7 m depth) and frozen at −80°C until isotope analysis. The N isotope composition of bulk PON was measured by elemental analyser-isotope ratio mass spectrometry at the University of Cape Town. See methods section of Smart et al. (2020) for more detail.

Data Processing Description

Dataset Processing Description

N isotope measurements were referenced to atmospheric N₂ using three in-house organic standards: Choc, Merck Gel, and Valine. Samples containing GF/F material were additionally corrected for the contribution of the N blank associated with the filter paper.

BCO-DMO Processing:
- added ISO_DateTime field.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-0922345	NSF Division of Ocean Sciences
OCE-1060947	NSF Division of Ocean Sciences
PLR-1401489	NSF Division of Polar Programs

Instruments

Elemental Analyzer

Supplied Name: Thermo Scientific FLASH 2000 elemental analyzer

Supplied Description:

Instrument Type

Generic Name: Elemental Analyzer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB01/

Generic Description:

Instruments that quantify carbon, nitrogen and sometimes other elements by combusting the sample at very high temperature and assaying the resulting gaseous oxides. Usually used for samples including organic material.

Isotope-ratio Mass Spectrometer

Supplied Name: Thermo Scientific Delta V Plus mass spectrometer

Supplied Description:

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
cruise	Cruise identifier	unitless	cruise_id
leg	Cruise leg	unitless	leg
ship	Ship name	unitless	ship
date	Date; format: yyyy-mm-dd	unitless	date
time	Time; format: HH:MM	unitless	time
latitude	Latitude; positive values = North	decimal degrees	lat
longitude	Longitude; positive values = East	decimal degrees	lon
PONconc_avg	Mean PON concentration. PON is the bulk (> 0.3 µm) particulate organic nitrogen in surface waters filtered from the ship's underway intake) concentration.	micrometers (µm)	PON
PONconc_sd	Standard deviation of PONconc_avg	micrometers (µm)	PON
PONconc_n	Number of replicate measurements of PON	unitless	num_reps
PONd15N_avg	Mean PON d15N. d15N is the nitrogen isotopic composition of a sample expressed in delta notation (d15N in units of per mil, ‰) relative to atmospheric N2, where d15N = {[(15N/14N)sample/(15N/14N)atmN2] – 1} × 1000.	per mil vs AIR	d15N
PONd15N_sd	Standard deviation of PONd15N_avg	per mil vs AIR	d15N
PONd15N_n	Number of replicate measurements of PONd15N	unitless	num_reps
ISO_DateTime_UTC	Date and time formatted to the ISO 8601 standard; format: yyyy-mm-ddTHH:MM	yyyy-MM-dd'T'HH:mm	date

Database

Contribute Data

Dataset: Southern Ocean particulate organic N isotopes
Deployment: VOY016

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Southern Ocean particulate organic N isotopesDeployment: VOY016

Dataset acquisition description

Dataset Processing Description

Dataset: Southern Ocean particulate organic N isotopes
Deployment: VOY016