Dataset: Macronutrients from a 2014 IRNBRU cruise Rosette Data

Name: Macronutrient concentrations from samples collected using rosette on R/V Melville MV1405 (IRN-BRU) cruise in the California Current System in July 2014
Published: 2024-11-05
Keywords: California Current System, coastal upwelling, cyclonic eddies, oceans

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Spatial Extent: N:42.667 E:-120.026 S:34.231 W:-126.752

The California Current System, 33-44N, 118-128W, surface to 1500m max

Temporal Extent: 2014-07-05 - 2014-07-24

Project:

Accomplishment Based Renewal: An iron limitation mosaic within the central California Current System (iron limitation mosaic)

Principal Investigator:

Kenneth W. Bruland (University of California-Santa Cruz, UCSC)

Scientist:

Tyler Coale (University of California-Santa Cruz, UCSC)

Student:

Claire P. Till (University of California-Santa Cruz, UCSC)

BCO-DMO Data Manager:

Audrey Mickle (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2024-11-05

Restricted:

Validated:

Current State:

Preliminary and in progress

Macronutrient concentrations from samples collected using rosette on R/V Melville MV1405 (IRN-BRU) cruise in the California Current System in July 2014

Abstract:

This dataset includes macronutrient concentrations from seawater samples collected on R/V Melville MV1405 while investigating the mosaic of the California Current System in July 2014 using the shipboard rosette. It includes depth profiles of an active upwelling site nearshore over the shelf in northern California (Station 2), a more aged upwelling site offshore of the shelf break in southern Oregon (Station 28), a station in the Santa Barbara Basin that got suboxic in the lower depths of the water column (Station 29), and a set of stations (9, 12 and 15) that show two cyclonic eddies, one two months younger (station 9) than the other (station 15), but both coming from roughly the same place and moving offshore, with station 12 in between them in an offshoot of the California Current. The chief scientist of the cruise was Ken Bruland. Nutrient samples were analyzed by Tyler Coale. See related datasets for additional macronutrient concentrations and dissolved trace metal concentrations found in GoFlo and surface samples collected on MV1405.

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Methods & Sampling

Nitrate-nitrite, Phosphate, Silicate, Nitrite

Samples were collected from the ship's rosette. Samples were analyzed shortly after collection at sea using standard spectrophotometric methods (Parsons 1984) on a Lachat QuickChem 8000 Flow Injection Analysis System.

BCO-DMO Processing

- Imported original file "IRNBRU macronutrient rosette data.xlsx" into the BCO-DMO system.
- Combined "Latitude_degrees" and "Latitude_mins"
- Combined "Longitude_degrees" and "Longitude_mins"
- Converted Latitude and Longitude to decimal degrees
- Converted "date" from %m-%d-%y to ISO format %Y-%m-%d and changed parameter name to "Sampling_date"
- Created flag field "Nitrate_plus_nitrite_flag" to account for <LOD information for the "nitrate+nitrite" field
- Renamed fields to comply with BCO-DMO naming conventions, removing special characters and spaces
- Saved the final file as "942883_v1_iron_limitation_rosette"

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1259776

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
MV1405	IrnBru IronBru	2014-07-03	R/V Melville	Kenneth W. Bruland (Chief Scientist)	data info

Instruments

CTD - profiler

Supplied Name: Rosette

Supplied Description:

Instrument Type

Generic Name: CTD - profiler

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/130/

Generic Description:

The Conductivity, Temperature, Depth (CTD) unit is an integrated instrument package designed to measure the conductivity, temperature, and pressure (depth) of the water column. The instrument is lowered via cable through the water column. It permits scientists to observe the physical properties in real-time via a conducting cable, which is typically connected to a CTD to a deck unit and computer on a ship. The CTD is often configured with additional optional sensors including fluorometers, transmissometers and/or radiometers. It is often combined with a Rosette of water sampling bottles (e.g. Niskin, GO-FLO) for collecting discrete water samples during the cast.

This term applies to profiling CTDs. For fixed CTDs, see https://www.bco-dmo.org/instrument/869934.

Lachat QuikChem 8500 flow injection analysis system

Supplied Name: Lachat QuickChem 8000 Flow Injection Analysis System

Supplied Description:

Nutrients were analyzed with a Lachat QuickChem 8000 Flow Injection Analysis System.

Instrument Type

Generic Name: Lachat QuikChem 8500 flow injection analysis system

Acronym: QuikChem 8500

Generic Description:

The Lachat QuikChem 8500 Series 2 Flow Injection Analysis System features high sample throughput and simple, but rapid, method changeover. The QuikChem 8500 Series 2 system maximises productivity in determining ionic species in a variety of sample types, from sub-ppb to percent concentrations. Analysis takes 20 to 60 seconds, with a sample throughput of 60 to 120 samples per hour.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Sample_date	Date of sample collection Format: %Y-%m-%d	unitless	date
Latitude	Latitude of sampling site, negative values = South	decimal degrees	lat
Longitude	Longitude of sampling site, negative values = West	decimal degrees	lon
Station_number	Station identification	unitless	site
Station_notes	Station notes	unitless	site_descrip
Depth	Sample depth	m	depth
Phosphate	Phosphate concentrations	umol/kg	PO4
Silicic_acid	Silicic_acid concentrations	umol/kg	Silicate
Nitrate_plus_nitrite	Nitrate and nitrite concentrations	umol/kg	NO3_NO2
Nitrate_plus_nitrite_flag	Flag indicates wether the nitrate+nitrite measurement was detectable; values less than detection limit are marked "<LOD"	unitless	q_flag
Nitrite	Nitrate, NO2	umol/kg	NO2
Nitrate	Nitrate, NO3	umol/kg	NO3

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Dataset: Macronutrients from a 2014 IRNBRU cruise Rosette Data