Dataset: Particle bulk d15N values
Deployment: SR1812

Particle bulk d15N values

Principal Investigator:

Hilary G. Close (University of Miami Rosenstiel School of Marine and Atmospheric Science, UM-RSMAS)

Co-Principal Investigator:

Brian N. Popp (University of Hawaiʻi at Mānoa, SOEST)

Student:

Paul K. Wojtal (University of Miami Rosenstiel School of Marine and Atmospheric Science, UM-RSMAS)

BCO-DMO Data Manager:

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

Project:

Collaborative Research: Isotopic Indicators for Mechanisms of Organic Matter Degradation in the Northeast Pacific (EXPORTS) (EXPORTS Isotopes)

Deployment Synonyms:

EXPORTS

Data URL:

https://www.bco-dmo.org/dataset-deployment/880383/data

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Description

Methods & Sampling

Dataset acquisition description

In situ pump filtration was performed using large volume pumps (WTS-LV; McLane Research Laboratories, Inc.) outfitted with mini-MULVFS (Multiple Unit Large Volume in-situ Filtration System) filter holders (Bishop et al. 2012). Pumps were loaded with filter stacks of either 3 filter pore sizes (51- and 5-um acid cleaned Nitex screens and 1 um pre-combusted quartz fiber filter) or 4 filter pore sizes (51- and 6-um acid cleaned Nitex screens, a double layer of 1 um pre-combusted quartz fiber filters, and a double layer of 0.3 um of pre-combusted glass fiber filters). Samples were frozen at -80 degrees Celsius until laboratory analysis. Sediment trap collection was performed using surface tethered sediment traps (STT) and neutrally buoyant sediment traps (NBST). Particles were collected in polycarbonate tubes with a collection area of 0.0113 m² and triggered to close at the end of the sampling period. Samples were collected in 500 mL of 70 ppt salinity, 0.1% formaldehyde-poisoned brine, buffered to pH 8.5 with borate and overlain with 1‑um filtered surface seawater. After collection and allowing particles to sink to the bottom of the tube on board the ship for an hour, brine was filtered through a 335‑um polyester screen and rotary wet split onto pre-combusted glass fiber filters with a pore size of 0.7 um. Samples were frozen at -80 degrees Celsius until laboratory analysis.

Subsamples were split gravimetrically and packed directly into tin capsules for elemental and isotopic composition.

Analyses were carried out using a Thermo Fisher Scientific Flash Elemental Analyzer (EA) coupled to a MAT 253 Plus Isotope Ratio Mass Spectrometer (IRMS) via a Conflo IV open split interface. The EA oxidation reactor was held at 980 degrees C, the reduction reactor at 650 degrees C, and the gas chromatography column at 65 degrees C.

Data Processing Description

Dataset Processing Description

Data Processing:
Data were processed through Thermo Fisher Isodat 3.0 and Microsoft Excel.

BCO-DMO Processing:
- replaced "n/a" with "nd" as missing data value ("no data");
- replaced hyphens with underscores in parameter names to comply with BCO-DMO naming conventions;
- changed all date fields to format YYYY-MM-DD.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1830016	NSF Division of Ocean Sciences

Instruments

Elemental Analyzer

Supplied Name: Thermo Fisher Scientific Flash Elemental Analyzer (EA)

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: MAT 253 Plus Isotope Ratio Mass Spectrometer (IRMS)

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).

McLane Large Volume Pumping System WTS-LV

Supplied Name: large volume pumps (WTS-LV; McLane Research Laboratories, Inc.)

Supplied Description:

Instrument Type

Generic Name: McLane Large Volume Pumping System WTS-LV

Acronym: WTS-LV

Generic Description:

The WTS-LV is a Water Transfer System (WTS) Large Volume (LV) pumping instrument designed and manufactured by McLane Research Labs (Falmouth, MA, USA). It is a large-volume, single-event sampler that collects suspended and dissolved particulate samples in situ.

Ambient water is drawn through a modular filter holder onto a 142-millimeter (mm) membrane without passing through the pump. The standard two-tier filter holder provides prefiltering and size fractioning. Collection targets include chlorophyll maximum, particulate trace metals, and phytoplankton. It features different flow rates and filter porosity to support a range of specimen collection. Sampling can be programmed to start at a scheduled time or begin with a countdown delay. It also features a dynamic pump speed algorithm that adjusts flow to protect the sample as material accumulates on the filter. Several pump options range from 0.5 to 30 liters per minute, with a max volume of 2,500 to 36,000 liters depending on the pump and battery pack used. The standard model is depth rated to 5,500 meters, with a deeper 7,000-meter option available. The operating temperature is -4 to 35 degrees Celsius.

The WTS-LV is available in four different configurations: Standard, Upright, Bore Hole, and Dual Filter Sampler. The high-capacity upright WTS-LV model provides three times the battery life of the standard model. The Bore-Hole WTS-LV is designed to fit through a narrow opening such as a 30-centimeter borehole. The dual filter WTS-LV features two vertical intake 142 mm filter holders to allow simultaneous filtering using two different porosities.

Multiple Unit Large Volume Filtration System

Supplied Name: mini-MULVFS (Multiple Unit Large Volume in-situ Filtration System)

Supplied Description:

Instrument Type

Generic Name: Multiple Unit Large Volume Filtration System

Acronym: MULVFS

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/32/

Generic Description:

The Multiple Unit Large Volume Filtration System (MULVFS) was first described in Bishop et al., 1985 (doi: 10.1021/ba-1985-0209.ch009). The MULVFS consists of multiple (commonly 12) specialized particulate matter pumps, mounted in a frame and tethered to the ship by a cable (Bishop et al., 1985; Bishop and Wood, 2008). The MULVFS filters particulates from large volumes of seawater, although the exact protocols followed will vary for each project.

Neutrally Buoyant Sediment Trap

Supplied Name: neutrally buoyant sediment traps (NBST)

Supplied Description:

Instrument Type

Generic Name: Neutrally Buoyant Sediment Trap

Acronym: NBST

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

Generic Description:

In general, 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. The Neutrally Buoyant Sediment Trap (NBST) was designed by researchers at Woods Hole Oceanographic Institution. The central cylinder of the NBST controls buoyancy and houses a satellite transmitter. The other tubes collect sediment as the trap drifts in currents at a predetermined depth. The samples are collected when the tubes snap shut before the trap returns to the surface. (more: http://www.whoi.edu/instruments/viewInstrument.do?id=10286)

Sediment Trap

Supplied Name: surface tethered sediment traps (STT)

Supplied Description:

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Cruise	Cruise designation	Unitless	cruise_id
Cruise_SampleID	Sample Number given to each filter	Unitless	sample
R2R_Event	R2R catalog identifier for this cruise	Unitless	event
Latitude	Latitude in decimal degrees North	Decimal degrees North	lat
Longitude	Longitude in decimal degrees West	Decimal degrees West	lon
ISO_DateTime_UTC	Date and time (UTC) of sampling in ISO8601 format: YYYY-MM-DDThh:mm:ssZ	Unitless	ISO_DateTime_UTC
Date	Sampling date (UTC); format: YYYY-MM-DD	Unitless	date
Time	Sampling time (UTC); format: hh:mm:ss	Unitless	time
Depth	Depth of pump deployment	meters (m)	depth
Size_Fraction_Min	Minimum size fraction captured on filter	micrometers (mm)	filter_size
Size_Fraction_Max	Maximum size fraction captured on filter	micrometers (mm)	filter_size
Volume_Filtered	Volume of water filtered through the filter	liters (L)	volume
Start_R2R_Event	R2R catalog identifier for the start of the sediment trap deployment for this cruise	Unitless	event
End_R2R_Event	R2R catalog identifier for the end of the sediment trap deployment for this cruise	Unitless	event
Deploy_Latitude	Latitude at time of sediment trap deployment in decimal degrees North	Decimal degrees North	lat
Deploy_Longitude	Longitude at time of sediment trap deployment in decimal degrees West	Decimal degrees West	lon
Resurfaced_Latitude	Latitude at time of sediment trap resurface in decimal degrees North	Decimal degrees North	lat
Resurfaced_Longitude	Longitude at time of sediment trap resurface in decimal degrees West	Decimal degrees West	lon
Recover_Latitude	Latitude at time of sediment trap recovery in decimal degrees North	Decimal degrees North	lat
Recover_Longitude	Longitude at time of sediment trap recovery in decimal degrees West	Decimal degrees West	lon
ISO_DateTime_UTC_Deployed	Date and time (UTC) of sediment trap deployment in ISO8601 format: YYYY-MM-DDThh:mm:ssZ	Unitless	ISO_DateTime_UTC
Date_Deployed	Sediment trap deployment date (UTC); format: YYYY-MM-DD	Unitless	date
Time_Deployed	Sediment trap deployment time (UTC); format: hh:mm:ss	Unitless	time
ISO_DateTime_UTC_AtDepth	Date and time (UTC) of sediment trap reaching sampling depth in ISO8601 format: YYYY-MM-DDThh:mm:ssZ	Unitless	ISO_DateTime_UTC
Date_AtDepth	Sediment trap reaching sampling depth date (UTC); format: YYYY-MM-DD	Unitless	date
Time_AtDepth	Sediment trap reaching sampling depth time (UTC); format: hh:mm:ss	Unitless	time
ISO_DateTime_UTC_LidsClosed	Date and time (UTC) of sediment trap tube lids closing in ISO8601 format: YYYY-MM-DDThh:mm:ssZ	Unitless	ISO_DateTime_UTC
Date_LidsClosed	Sediment trap tube lids closing date (UTC); format: YYYY-MM-DD	Unitless	date
Time_LidsClosed	Sediment trap tube lids closing time (UTC); format: hh:mm:ss	Unitless	time
ISO_DateTime_UTC_Resurfaced	Date and time (UTC) of sediment trap resurfacing in ISO8601 format: YYYY-MM-DDThh:mm:ssZ	Unitless	ISO_DateTime_UTC
Date_Resurfaced	Sediment trap resurfacing date (UTC); format: YYYY-MM-DD	Unitless	date
Time_Resurfaced	Sediment resurfacing time (UTC); format: hh:mm:ss	Unitless	time
ISO_DateTime_UTC_Recovered	Date and time (UTC) of sediment trap recovery in ISO8601 format: YYYY-MM-DDThh:mm:ssZ	Unitless	ISO_DateTime_UTC
Date_Recovered	Sediment trap recovery date (UTC); format: YYYY-MM-DD	Unitless	date
Time_Recovered	Sediment recovery time (UTC); format: hh:mm:ss	Unitless	time
Target_Depth	Target sampling depth for sediment traps	meters (m)	depth
Actual_Depth	Actual sampling depth for sediment traps	meters (m)	depth
Time_Elapsed_Deploy_to_Recover	Time elapsed between sediment trap being deployed and sediment trap being recovered	days (d)	time_elapsed
Flux	Area of collection of the sediment traps divided by the number of days of collection	square meters per day (m2/d)	flux
d15N	The isotopic composition of particulate nitrogen in the sample	permil relative to AIR (‰)	d15N
SD_d15N	The standard deviation of the isotopic composition of particulate nitrogen in the sample	permil relative to AIR (‰)	d15N
PN_Conc	The concentration of particulate nitrogen in the sample	micromoles per cubic meter (mmol/m3)	N
PN_Flux	The flux of particulate nitrogen in the sample	micromoles per square meter per day (mmol/m2/d)	N

Database

Contribute Data

Dataset: Particle bulk d15N values
Deployment: SR1812

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Particle bulk d15N valuesDeployment: SR1812

Dataset acquisition description

Dataset Processing Description

Dataset: Particle bulk d15N values
Deployment: SR1812