Dataset: d15N of PON from Net Tows

Name: d15N of size-fractionated particulate organic nitrogen (PON) from net tows in the Sargasso Sea at BATS and Hydro Station S
Published: 2018-10-01
Keywords: oceans

Cite This Dataset

DOI:10.1575/1912/bco-dmo.746854.1

Spatial Extent: N:32.167 E:-64.167 S:31.667 W:-64.567

Temporal Extent: 2011-07 - 2013-11

Project:

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

Principal Investigator:

Daniel M. Sigman (Princeton University)

Contact:

Sandi M. Smart (Stellenbosch University)

BCO-DMO Data Manager:

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

Version:

Version Date:

2018-10-01

Restricted:

Validated:

Yes

Current State:

Final no updates expected

d15N of size-fractionated particulate organic nitrogen (PON) from net tows in the Sargasso Sea at BATS and Hydro Station S

Abstract:

d15N of size-fractionated particulate organic nitrogen (PON) from net tows in the Sargasso Sea (off Bermuda) in the western subtropical North Atlantic. Net tow samples from 0-200 m at BATS (31°40’N, 64°10’W) and Hydro Station S (32°10’N, 64°34’W).

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2018-10-01	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.1575/1912/bco-dmo.746854.1	2020-01-10

Description

Data published in:
Smart, S.M., H. Ren, S.E. Fawcett, R. Schiebel, M. Conte, P.A. Rafter, K.K. Ellis, M.A. Weigand, S. Oleynik, G.H. Haug, D.M. Sigman (2018). Ground-truthing the planktic foraminifer-bound nitrogen isotope paleo-proxy in the Sargasso Sea, Geochimica et Cosmochimica Acta, doi: https://doi.org/10.1016/j.gca.2018.05.023

Methods & Sampling

PON samples were collected from the upper 200 m of the water column using a 1-m2, 200-um-mesh plankton net aboard the R/V Atlantic Explorer during ten cruises between July 2011 and November 2013. Approximately 10% of the tow material was size-fractionated and freeze-dried for elemental and isotopic analysis of PON. See methods section of Smart et al. (2018) for more details of sample collection, isotope analysis, and data quality.

The d15N of tow-collected, size-fractionated PON was determined by elemental analyzer-isotope ratio mass spectrometry (an Elementar Vario Isotope Cube online to an Elementar Isoprime visION), referencing to atmospheric N2 using USGS-40 and an in-house aminocaproic acid standard.

Data Processing Description

Data processing: After correcting for drift (when necessary) and non-linearity in the data, isotope ratio measurements were calibrated to N2 in air using international reference materials that were included in every run.

Missing data identifier = -999

BCO-DMO Processing: modified parameter names (replaced spaces w/ underscores; replaced # with "num").

Data Files

File
d15N_NetTows.csv (Comma Separated Values (.csv), 3.80 KB) MD5:57fda63f01f76234613d273c22dc0f26 Primary data file for dataset ID 746854

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1060947
NSF Division of Ocean Sciences	OCE-0960802
NSF Division of Ocean Sciences	OCE-1136345

Deployments

None available yet

Instruments

Elemental Analyzer

Supplied Name: Elementar Vario Isotope Cube

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: Elementar Isoprime visION

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).

Plankton Net

Supplied Name: mesh plankton net

Supplied Description:

PON samples were collected from the upper 200 m of the water column using a 1-m2, 200-μm-mesh plankton net.

Instrument Type

Generic Name: Plankton Net

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/22/

Generic Description:

A Plankton Net is a generic term for a sampling net that is used to collect plankton. It is used only when detailed instrument documentation is not available.

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
cruise	Cruise identifier	unitless	cruise_id
date	Date of collection (month and 2-digit year)	unitless	date
depth	Sample depth	meters	depth
size_fraction	Size fraction	micrometers (um)	samp_fraction
d15N_AVG	Average d15N (per mil vs. AIR). 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	d15N
d15N_stdev	Standard deviation of d15N_AVG	per mil	d15N
num_measurements	Number of measurements	unitless	numb_obs