Dataset: d15N of PON from Sediment Traps

Name: d15N of size-fractionated particulate organic nitrogen (PON) from sediment traps in the Sargasso Sea
Published: 2018-10-01
Keywords: oceans

Cite This Dataset

DOI:10.1575/1912/bco-dmo.747014.1

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

Temporal Extent: 2009-11 - 2010-11

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 sediment traps in the Sargasso Sea

Abstract:

d15N of size-fractionated particulate organic nitrogen (PON) from sediment traps n the Sargasso Sea (off Bermuda) in the western subtropical North Atlantic. Sediment traps from 500 m, 1500 m, and 3200 m water depth (31°50’N, 64°10’W).

Expand/Collapse All

Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2018-10-01	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.1575/1912/bco-dmo.747014.1	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

Bulk sinking PON was collected by sediment traps moored at 500 m, 1500 m, and 3200 m water depth (Conte et al., 2001; Conte and Weber, 2014) between November 2009 and November 2010, with each sample representing a two-week collection. Isotope measurements were made on the <125 um size fraction. See methods section of Smart et al. (2018) for more details of sample collection, isotope analysis and data quality.

The d15N of sinking PON was analyzed on the <125 um size fraction of sediment trap samples by mass spectrometry using either a Europa 20-20 or GV Isoprime mass spectrometer.

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 hyphens and spaces w/ underscores);
- converted date format from mm/dd/yyyy to yyyy-mm-dd.

Data Files

File
d15N_SedimentTraps.csv (Comma Separated Values (.csv), 722 bytes) MD5:e0837bccd3b1ac74774bba386bac0257 Primary data file for dataset ID 747014

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

Isotope-ratio Mass Spectrometer

Supplied Name: Europa 20-20 or GV Isoprime

Supplied Description:

The d15N of sinking PON was analyzed on the <125 um size fraction of sediment trap samples by mass spectrometry using either a Europa 20-20 or GV Isoprime 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).

Sediment Trap

Supplied Name: sediment traps

Supplied Description:

Bulk sinking PON was collected by sediment traps moored at 500 m, 1500 m, and 3200 m water depth.

Instrument Type

Generic Name: Sediment Trap

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/33/

Generic Description:

Sediment traps are specially designed containers deployed in the water column for periods of time to collect particles from the water column falling toward the sea floor. In general a sediment trap has a jar at the bottom to collect the sample and a broad funnel-shaped opening at the top with baffles to keep out very large objects and help prevent the funnel from clogging. This designation is used when the specific type of sediment trap was not specified by the contributing investigator.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
mid_collection_date	Collection date (yyyy-mm-dd)	unitless	date
bulk_d15N_500m	Bulk d15N (per mil vs. AIR) of the <125 um size fraction from 500m. 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
bulk_d15N_1500m	Bulk d15N (per mil vs. AIR) of the <125 um size fraction from 1500m.	per mil	d15N
bulk_d15N_3200m	Bulk d15N (per mil vs. AIR) of the <125 um size fraction from 3200m.	per mil	d15N