Dataset: GP16 Dissolved Fe, Mn, Cd, Cu and Zn
Deployment: TN303

Dissolved Fe, Mn, Cd, Cu and Zn from bottle samples

Principal Investigator:

Jingfeng Wu (University of Miami Rosenstiel School of Marine and Atmospheric Science, UM-RSMAS)

Student:

Saeed Roshan (University of Miami Rosenstiel School of Marine and Atmospheric Science, UM-RSMAS)

Contact:

Jingfeng Wu (University of Miami Rosenstiel School of Marine and Atmospheric Science, UM-RSMAS)

BCO-DMO Data Manager:

Amber D. York (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Geotraces Pacific section: Dissolved Fe, Mn, Zn, Cu, and Cd and colloidal Fe (FeMnCdCuZn)

U.S. GEOTRACES East Pacific Zonal Transect (GP16) (U.S. GEOTRACES EPZT)

Deployment Synonyms:

GP16, GEOTRACES EPZT, GEOTRACES East Pacific Zonal Transect (EPZT), GT13, 325020131025

Data URL:

https://www.bco-dmo.org/dataset-deployment/671157/data

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Description

This dataset contains dissolved concentrations of trace metals including iron (Fe), manganese (Mn), cadmium (Cd), copper (Cu), and zinc (Zn) from bottle samples. The samples were collected during the U.S. GEOTRACES EPZT cruise TN303 aboard the R/V Thomas G. Thompson between November and December of 2013. Also included in this dataset are latitude, longitude, depth, event number, station number, cast number, and bottle number.

Methods & Sampling

Dataset acquisition description

Samples were collected by the U.S. GEOTRACES sampling team from 24 modified 12-L Teflon-coated GO-FLO samplers mounted on the GEOTRACES clean CTD rosette system (Cutter and Bruland 2012). The U.S. GEOTRACES sampling team filtered the samples through 0.2 um Supor Acropak filter cartridges (Pall) inside the U.S. GEOTRACES clean-air laboratory van. Filtered samples were stored in LDPE 0.5-L bottles. After transportation to the land-based lab, samples were acidified using trace metal grade nitric acid (HNO3). Samples were stored at room temperature for more than two months prior to analysis.

Dissolved trace metal analysis:

Acidified samples were determined for dissolved Fe, Mn, Cd, Cu, and Zn using Mg(OH)2 co-precipitation method coupled to isotope dilution and by means of a multiple-collector inductively coupled plasma mass spectrometer. The method is a modified version of Wu and Boyle (1997 and 1998).

Data Processing Description

Dataset Processing Description

Data processing was carried out using Thermo Scientific software and also Microsoft Excel.

BCO-DMO Data Manager Processing Notes:
* added a conventional header with dataset name, PI name, version date
* modified parameter names to conform with BCO-DMO naming conventions
* blank values replaced with no data value 'nd'
* removed data column "Cruise" containing value "USGT_EPZT" for all cells
* added SECT_ID "EPZT" and cruise_id "TN303"
* changed parameter names with _std to _SD to be consistent with other GEOTRACES datasets
* joined dataset as described below to add :
CASTNO,GEOTRC_EVENTNO,BTL_ISO_DATETIME_UTC,BTLNBR,BTLNBR_FLAG_W,ISO_DATETIME_UTC_START_EVENT,EVENT_LAT,EVENT_LON,STNNBR,CTDDEPTH,CTDPRS
* changed depth variable to PI_depth to distinguish between the master epzt depth and the rounded depth originally in the dataset.
* new data version posted (2017-03-21) which replaces version 2016-12-28. The only change is 5 replacements of "nd " to "nd" with space removed.

Additional GEOTRACES Processing:
As was done for the GEOTRACES-NAT data, BCO-DMO added standard US GEOTRACES information, such as the US GEOTRACES event number, to each submitted dataset lacking this information. To accomplish this, BCO-DMO compiled a 'master' dataset composed of the following parameters:

cruise_id, EXPOCODE,SECT_ID, STNNBR, CASTNO, GEOTRC_EVENTNO, GEOTRC_SAMPNO, GEOTRC_INSTR, SAMPNO, GF_NO, BTLNBR, BTLNBR_FLAG_W, DATE_START_EVENT, TIME_START_EVENT, ISO_DATETIME_UTC_START_EVENT, EVENT_LAT, EVENT_LON, DEPTH_MIN, DEPTH_MAX, BTL_DATE, BTL_TIME, BTL_ISO_DATETIME_UTC, BTL_LAT, BTL_LON, ODF_CTDPRS, SMDEPTH, FMDEPTH, BTMDEPTH, CTDPRS, CTDDEPTH.

This added information will facilitate subsequent analysis and inter comparison of the datasets.

Bottle parameters in the master file were taken from the GT-C_Bottle and ODF_Bottle datasets. Non-bottle parameters, including those from GeoFish tows, Aerosol sampling, and McLane Pumps, were taken from the TN303 Event Log (version 30 Oct 2014). Where applicable, pump information was taken from the PUMP_Nuts_Sals dataset.

A standardized BCO-DMO method (called "join") was then used to merge the missing parameters to each US GEOTRACES dataset, most often by matching on sample_GEOTRC or on some unique combination of other parameters.

If the master parameters were included in the original data file and the values did not differ from the master file, the original data columns were retained and the names of the parameters were changed from the PI-submitted names to the standardized master names. If there were differences between the PI-supplied parameter values and those in the master file, both columns were retained. If the original data submission included all of the master parameters, no additional columns were added, but parameter names were modified to match the naming conventions of the master file.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1233155	NSF Division of Ocean Sciences

Instruments

CTD Sea-Bird SBE 911plus

Supplied Name: GEOTRACES clean CTD rosette system

Supplied Description:

Instrument Type

Generic Name: CTD Sea-Bird SBE 911plus

Acronym: CTD SBE 911plus

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0058/

Generic Description:

The Sea-Bird SBE 911 plus is a type of CTD instrument package for continuous measurement of conductivity, temperature and pressure. The SBE 911 plus includes the SBE 9plus Underwater Unit and the SBE 11plus Deck Unit (for real-time readout using conductive wire) for deployment from a vessel. The combination of the SBE 9 plus and SBE 11 plus is called a SBE 911 plus. The SBE 9 plus uses Sea-Bird's standard modular temperature and conductivity sensors (SBE 3 plus and SBE 4). The SBE 9 plus CTD can be configured with up to eight auxiliary sensors to measure other parameters including dissolved oxygen, pH, turbidity, fluorescence, light (PAR), light transmission, etc.). more information from Sea-Bird Electronics

GO-FLO Teflon Trace Metal Bottle

Supplied Name: Teflon-coated GO-FLO

Supplied Description:

Instrument Type

Generic Name: GO-FLO Teflon Trace Metal Bottle

Acronym: GO-FLO Teflon TM

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

Generic Description:

GO-FLO Teflon-lined Trace Metal free sampling bottles are used for collecting water samples for trace metal, nutrient and pigment analysis. The GO-FLO sampling bottle is designed specifically to avoid sample contamination at the surface, internal spring contamination, loss of sample on deck (internal seals), and exchange of water from different depths.

Inductively Coupled Plasma Mass Spectrometer

Supplied Name: multiple-collector inductively coupled plasma mass spectrometer

Supplied Description:

Instrument Type

Generic Name: Inductively Coupled Plasma Mass Spectrometer

Acronym: ICP Mass Spec

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB15/

Generic Description:

An ICP Mass Spec is an instrument that passes nebulized samples into an inductively-coupled gas plasma (8-10000 K) where they are atomized and ionized. Ions of specific mass-to-charge ratios are quantified in a quadrupole mass spectrometer.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
GEOTRC_SAMPNO	Unique GEOTRACES sample number based on USGT EPZT documentation	unitless	sample
year	year of sampling	untiless	year
STNNBR	station number from USGT EPZT cruise documentation	unitless	station
PI_depth	depth of sample	meters	depth
Fe_D_CONC_BOTTLE	dissolved concentration (<0.2 um) of iron (Fe) from bottle sample	nanomolar(nM)	trace_metal_conc
Fe_D_CONC_BOTTLE_SD	standard deviation of dissolved concentration (<0.2 um) of iron (Fe) from bottle sample	nanomolar(nM)	trace_metal_conc
Mn_D_CONC_BOTTLE	dissolved concentration (<0.2 um) of manganese (Mn) from bottle sample	nanomolar(nM)	trace_metal_conc
Mn_D_CONC_BOTTLE_SD	standard deviation of dissolved concentration (<0.2 um) of manganese (Mn) from bottle sample	nanomolar(nM)	trace_metal_conc
Cd_D_CONC_BOTTLE	dissolved concentration (<0.2 um) of cadmium (Cd) from bottle sample	picomolar(pM)	trace_metal_conc
Cd_D_CONC_BOTTLE_SD	standard deviation of dissolved concentration (<0.2 um) of cadmium (Cd) from bottle sample	picomolar(pM)	trace_metal_conc
Cu_D_CONC_BOTTLE	dissolved concentration (<0.2 um) of copper (Cu) from bottle sample	nanomolar(nM)	trace_metal_conc
Cu_D_CONC_BOTTLE_SD	standard deviation of dissolved concentration (<0.2 um) of copper (Cu) from bottle sample	nanomolar(nM)	trace_metal_conc
Zn_D_CONC_BOTTLE	dissolved concentration (<0.2 um) of zinc (Zn) from bottle sample	nanomolar(nM)	trace_metal_conc
Zn_D_CONC_BOTTLE_SD	standard deviation of dissolved concentration (<0.2 um) of zinc (Zn) from bottle sample	nanomolar(nM)	trace_metal_conc
ISO_DATETIME_UTC_START_EVENT	ISO timestamp for start of sampling event in format YYYY-mm-ddTHH:MM:SS[.xx]Z (UTC time)	unitless	ISO_DateTime_UTC
BTLNBR	Identifier for GEOTRACES bottle sample	unitless	bottle
CASTNO	Identifier for CTD cast	unitless	cast
GEOTRC_EVENTNO	Identifier for GEOTRACES event	unitless	event
BTL_ISO_DATETIME_UTC	ISO timestamp for bottle sample in format YYYY-mm-ddTHH:MM:SS[.xx]Z (UTC time)	unitless	ISO_DateTime_UTC
EVENT_LAT	latitude of GEOTRACES event; north is positive	decimal degres	lat
EVENT_LON	longitude of GEOTRACES event; east is positive	decimal degrees	lon
CTDDEPTH	CTD bottle firing depth	meters	depth
CTDPRS	Pressure from CTD	decibars	press

Database

Contribute Data

Dataset: GP16 Dissolved Fe, Mn, Cd, Cu and Zn
Deployment: TN303

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: GP16 Dissolved Fe, Mn, Cd, Cu and ZnDeployment: TN303

Dataset acquisition description

Dataset Processing Description

Dataset: GP16 Dissolved Fe, Mn, Cd, Cu and Zn
Deployment: TN303