Dataset: CliOMZ Nutrient profile data

Name: CliOMZ Nutrient profile data
Published: 2025-01-14
Keywords: oceans

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Eastern Tropical and Subtropical Pacific Ocean

Temporal Extent: 2021-06-12 - 2023-06-09

Project:

Collaborative Research: Underexplored Connections between Nitrogen and Trace Metal Cycling in Oxygen Minimum Zones Mediated by Metalloenzyme Inventories (CliOMZ)

Principal Investigator:

Alyson E. Santoro (University of California-Santa Barbara, UCSB)

Scientist:

Barbara Bayer (University of Vienna)

Contact:

Barbara Bayer (University of Vienna)

Data Manager:

Sawyer Newman (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2025-01-14

Restricted:

Validated:

Current State:

Preliminary and in progress

Abstract:

These data include nutrient measurements from two oceanographic expeditions on R/V Roger Revelle from San Diego to San Diego, USA in June 2021 and on R/V Atlantic (CliOMZ AT50-10 expedition) from Golfito, Costa Rica to San Diego, USA in May-June 2023. Instruments used were a CTD profiler, a fluorometer, and a flow injection analysis system.

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Methods & Sampling

Water samples were collected during cruises RR2104 and AT50-10 in the eastern tropical and subtropical Pacific Ocean. Discrete water samples were obtained using a CTD rosette sampler equipped with 24 x 10 L Niskin bottles. Different depths were sampled ranging from 10 meters to 2200 meters.

Ammonium concentrations were measured on board from unfiltered 40 mL seawater samples using the o-phthaldialdehyde derivatization method with modifications as suggested in (Taylor et al. 2007) on an Aquafluor 8000 handheld fluorometer. Samples for nitrite and nitrate concentration measurements were syringe-filtered (0.22 µm, Sterivex) and stored at −20°C before concentrations were determined by Cd reduction coupled to colorimetric detection via the Griess assay on a Lachat autoanalyzer.

BCO-DMO Processing

- Converted the primary data file from a variable width plain text file to a CSV file.

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1924512

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
AT50-10	CliOMZ	2023-05-02	R/V Atlantis	Mak A. Saito (Chief Scientist) Alyson E. Santoro (Chief Scientist)	data info
RR2104		2021-06-12	R/V Roger Revelle	C. Anela Choy (Chief Scientist)	data info

Instruments

Flow Injection Analyzer

Supplied Name: QuikChem 8500 Series 2 Flow Injection System (Lachat Instruments)

Supplied Description:

Samples for nitrite and nitrate concentration measurements were syringe-filtered (0.22 µm, Sterivex) and stored at −20°C before concentrations were determined by Cd reduction coupled to colorimetric detection via the Griess assay on a Lachat autoanalyzer.

Instrument Type

Generic Name: Flow Injection Analyzer

Acronym: FIA

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB36/

Generic Description:

An instrument that performs flow injection analysis. Flow injection analysis (FIA) is an approach to chemical analysis that is accomplished by injecting a plug of sample into a flowing carrier stream. FIA is an automated method in which a sample is injected into a continuous flow of a carrier solution that mixes with other continuously flowing solutions before reaching a detector. Precision is dramatically increased when FIA is used instead of manual injections and as a result very specific FIA systems have been developed for a wide array of analytical techniques.

Fluorometer

Supplied Name: Aquafluor 8000 (Turner Designs)

Supplied Description:

Instrument Type

Generic Name: Fluorometer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/113/

Generic Description:

A fluorometer or fluorimeter is a device used to measure parameters of fluorescence: its intensity and wavelength distribution of emission spectrum after excitation by a certain spectrum of light. The instrument is designed to measure the amount of stimulated electromagnetic radiation produced by pulses of electromagnetic radiation emitted into a water sample or in situ.

Niskin bottle

Supplied Name: 24x10 L Niskin Bottles

Supplied Description:

Discrete water samples were collected using a rosette sampler equipped with 24×10 L Niskin bottles.

Instrument Type

Generic Name: Niskin bottle

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0412/

Generic Description:

A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24, or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc.

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Dataset: CliOMZ Nutrient profile data