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OAS accession Detail for 0278619
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Title: Particle bulk d15N values from EXPORTS cruises SR1812 on R/V Sally Ride and RR1813 on R/V Roger Revelle in August to September 2018 (NCEI Accession 0278619)
Abstract: This dataset contains chemical data collected on R/V Roger Revelle and R/V Sally Ride during cruises RR1813 and SR1812 from 2018-08-15 to 2018-09-05. These data include Nitrogen, d15N, and depth. The instruments used to collect these data include Elemental Analyzer, Isotope-ratio Mass Spectrometer, McLane Large Volume Pumping System WTS-LV, Multiple Unit Large Volume Filtration System, Neutrally Buoyant Sediment Trap, and Sediment Trap. These data were collected by Brian N. Popp of University of Hawaii at Manoa and Hilary G. Close of University of Miami Rosenstiel School of Marine and Atmospheric Science as part of the "Collaborative Research: Isotopic Indicators for Mechanisms of Organic Matter Degradation in the Northeast Pacific (EXPORTS) (EXPORTS Isotopes)" project and "EXport Processes in the Ocean from Remote Sensing (EXPORTS)" program. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2022-09-30.

The following is the text of the dataset description provided by BCO-DMO:

Particle bulk d15N values

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.
Date received: 20220930
Start date: 20180815
End date: 20180905
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West boundary: -145.297716
East boundary: -144.80516
North boundary: 50.672621
South boundary: 50.046084
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Submitting institution: Biological and Chemical Oceanography Data Management Office
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Metadata version: 2
Keydate: 2023-05-22 04:47:35+00
Editdate: 2024-02-20 19:35:28+00