Dataset: Dissolved trace metals and macronutrients from a 2014 IRNBRU cruise GoFlo Data

Name: Dissolved trace metals and macronutrients from samples collected using GoFlo 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

Cite This Dataset

DOI:10.26008/1912/bco-dmo.942928.1

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: 2014-07-06 - 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:

Yes

Current State:

Final no updates expected

Dissolved trace metals and macronutrients from samples collected using GoFlo on R/V Melville MV1405 (IRN-BRU) cruise in the California Current System in July 2014

Abstract:

This dataset is a suite of dissolved trace metal concentrations, along with macronutrient concentrations, collected using a GoFlo on R/V Melville cruise MV1405 (IRN-BRU) while investigating the mosaic of the California Current System in July 2014. 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. Trace metal samples were analyzed by Claire Till (nee Parker) as his graduate student. Nutrient samples were analyzed by Tyler Coale. See related datasets for additional samples using a regular rosette (macronutrient concentrations) and surface samples from a TowFish (macronutrient and dissolved trace metal concentrations) collected on MV1405.

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2024-11-05	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.942928.1	2024-11-25

Methods & Sampling

Nitrate-nitrite, Phosphate, Silicate, Nitrite

Samples were collected from teflon-coated Go-Flos on a non-metal line. Samples were analyzed shortly after collection at sea using standard spectrophotometric methods (Parsons 1984) on a Lachat QuickChem 8000 Flow Injection Analysis System.

Dissolved trace metals

Depth profiles were taken using individual teflon-coated GoFlo bottles on a non-metal line, which were sampled in a trace metal clean van at sea. Samples were filtered directly from the GoFlo through 0.2 μm Acropak Supor membrane capsule filters into pre-cleaned LDPE bottles. The acropaks were pre-cleaned and flushed with at least 250 mL of sample before sampling. Sample bottles were pre-cleaned cleaned rigorously as per the GEOTRACES cookbook (Cutter et al., 2014), and were rinsed with sample three times before filling. Samples were acidified at sea to a pH of ~1.7 with quartz-distilled 6 M HCl (4 mL per liter) and stored for analysis post-cruise. Samples were analyzed for trace metals after the cruise with the method of Biller and Bruland (2012), with modifications as described in Parker et al. (2016). Briefly, this involves buffering the seawater to pH 6.0 ± 0.2 immediately before pre-concentrating on PA1 resin. The resin was extracted with 1 N optima nitric acid with rhodium as an internal standard. Extracts were analyzed on the Thermo Fisher Element 2 extended range ICP-MS at UC Santa Cruz.

Iron was additionally analyzed shipboard with a flow injection analysis method published in Lohan et al. (2006) with modifications as described in Biller et al. (2013). Briefly, this method involves pre-concentrating the iron on a toyopearl column at pH 2, eluting it into a buffered (pH ~5.7) reaction stream that contains DPD, a molecule that turns pink when oxidized by iron. H2O2 is also in the reaction stream, which re-oxidizes the iron, so that each iron molecule can react with multiple DPD molecules, another mechanism to increase the iron signal. The reaction stream absorbance is measured with a flow through spectrophotometer.

Generally, the measurements from these two methods for Fe agreed well; where there was a problem with one or the other dataset, we only report one dataset.

BCO-DMO Processing

- Imported original file "IRNBRU TM and macronutrient GoFlo 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"
- Renamed fields to comply with BCO-DMO naming conventions, removing special characters and spaces
- Saved the final file as "942928_v1_iron_limitation_goflo.csv"

Data Files

File
942928_v1_iron_limitation_goflo.csv (Comma Separated Values (.csv), 6.58 KB) MD5:9fd544cf6cc4120a689f6267e4d7ee88 Primary data file for dataset ID 942928, version 1

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

GO-FLO Bottle

Supplied Name: Teflon coated GO-Flo bottles

Supplied Description:

Samples were collected with Teflon coated GO-Flo bottles (General Oceanics).

Instrument Type

Generic Name: GO-FLO Bottle

Acronym: GO-FLO

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/30/

Generic Description:

GO-FLO bottle cast used to collect water samples for pigment, nutrient, plankton, etc. The GO-FLO sampling bottle is specially designed to avoid sample contamination at the surface, internal spring contamination, loss of sample on deck (internal seals), and exchange of water from different depths.

Lachat QuikChem 8000 flow injection analyzer and Ion Chromatography (IC) 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 8000 flow injection analyzer and Ion Chromatography (IC) system

Generic Description:

The Lachat QuikChem 8000 can operate flow injection analysis and ion chromatography simultaneously and independently on the same instrument platform. Instrument includes sampler, dilutor, sampling pump, electronics unit, and data station. Analysis takes 20-60 seconds, with a sample throughput of 60-120 samples per hour. Measurements are in the range of parts per trillion to parts per hundred.

Thermo Scientific ELEMENT XR high resolution inductively coupled plasma mass spectrometer

Supplied Name: Thermo Element XR magnetic sector inductively coupled plasma mass spectrometer (ICP-MS)

Supplied Description:

Trace metal extracts were analyzed with a Thermo Element XR magnetic sector inductively coupled plasma mass spectrometer (ICP-MS)

Instrument Type

Generic Name: Thermo Scientific ELEMENT XR high resolution inductively coupled plasma mass spectrometer

Acronym: Element XR HR-ICP-MS

Generic Description:

A high-resolution (HR) inductively coupled plasma (ICP) mass spectrometer (MS) composed of a dual mode secondary electron multiplier (SEM) and a Faraday detector. The ELEMENT XR instrument has a dynamic range of 5 x 10^7 to 1 x 10^12 counts per second (cps), and allows simultaneous measurement of elements at concentrations over 1000 ug/g.

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
Nitrate_plus_nitrite	Nitrate and nitrite concentration	umol/kg	NO3_NO2
Phosphate	Phosphate concentration	umol/kg	PO4
Silicate	Silicic concentration	umol/kg	Silicate
Fe	Iron concentration	nmol/kg	Fe
Y	Yttrium concentration	pmol/kg	trace_metal_conc
Cd	Cadmium concentration	pmol/kg	Cd
La	Lanthanum concentration	pmol/kg	Lanthanum
Pb	Lead concentration	pmol/kg	Pb
Ce	Cerium concentration	pmol/kg	trace_metal_conc
Sc	Scandium concentration	pmol/kg	Sc
Mn	Manganese concentration	nmol/kg	Mn
Co	Cobalt concentration	pmol/kg	Co
Ni	Nickel concentration	nmol/kg	Ni
Cu	Copper concentration	nmol/kg	Cu
Zn	Zinc concentration	nmol/kg	Zn
Ga	Gallium concentration	pmol/kg	Ga