Dataset: GT10-11 - Fe Mn Zn Cd and Cu

Name: Dissolved Iron, Manganese, Zinc, Cadmium and Copper concentrations from R/V Knorr KN199-04, KN204-01 in the subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project)
Published: 2012-12-27
Keywords: oceans

Cite This Dataset

Spatial Extent: N:39.7007 E:-9.6601 S:17.3502 W:-69.8029

Project:

U.S. GEOTRACES North Atlantic Transect (GA03) (U.S. GEOTRACES NAT)

Program:

U.S. GEOTRACES (U.S. GEOTRACES)

Principal Investigator:

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

BCO-DMO Data Manager:

Ms Dicky Allison (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2012-12-27

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Dissolved Iron, Manganese, Zinc, Cadmium and Copper concentrations from R/V Knorr KN199-04, KN204-01 in the subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project)

Abstract:

Dissolved and dissolvable Fe, Mn, Zn, Cd and Cu concentrations from GeoTraces Go-Flo rosette casts analyzed by isotope dilution using Inductively Coupled Plasma Mass Spectrometry. Samples were collected at sea and analyzed later ashore.

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Description

NOTE: These Data were unrestricted when the GEOTRACES Intermediate Data Product was published by BODC.

Methods & Sampling

Sampling: Seawater samples for dissolved Fe, Mn, Zn, Cu and Cd analysis were collected using GEOTRACES trace metal clean sampler (Teflon coated Go-Flo Bottles attached to non-metallic rosette). The collected samples were passed through 0.4 micrometer diameter pore filter membrane before acidification by adding 2.8 ml triple distilled HCl per liter sample. The acidified samples were stored in acid washed low density polyethylene bottles at room temperature for more than 3 months before analysis.

Data Processing Description

Analytical Methods: Dissolved Fe, Zn, Cu and Cd in the seawater samples were analyzed using Mg(OH)₂ coprecipitation ID-ICPMS (isotope dilution - Inductively Coupled Plasma Mass Spectrometry) (Wu and Boyle, 1997; 1998). Dissolved Mn was measured using the same method modified by Boyle et al (2005). The precision and analytical blanks vary for each station and are provided together with each profile in the submitted file.

References: Wu J. and Boyle E. A. (1997) Low blank preconcentration technique for the determination of lead, copper, and cadmium in small-volume seawater samples by isotope dilution ICPMS. Anal. Chem. 69, 2464-2470.

Wu J. and Boyle E. A. (1998) Determination of iron in seawater by isotope dilution inductively couple plasma mass spectrometry after Mg(OH)₂ coprecipitation. Anal. Chim. Acta 367, 183-191.

Boyle E. A., Bergquist R. A., Hayser R. A. and Mahowald N. (2005) Iron, manganese, and lead at Hawaii ocean time-series station ALOHA: temporal variability in an intermediate water hydrothermal plume. Geochim. Cosmochim. Acta 69, 933-952.

BCO-DMO edits:
- Depth and Pressure occupied the 'Depth(m)' column. To be consistent, where necessary corrected to Depth in meters. (information from GT-C Bottle file)
- Cadmium concentration reported in both nM and pM. PI said change to pM.
- Cadmium concentration was displayed without decimal precision when submitted, although the Excel cells had 16 decimals of precision. DMO changed to two decimal places to be consistent with other Cd submitted. Submitted Cd blanks have zero to two decimals.
- Two portions of KN204-01, KN204-01A and KN204-01B, were reported as 'cruise_part'.
- Station nominal locations were provided by Chief Scientists because casts were not all in the same place as the original station location. This dataset had no cast information.
- 'nd's put in blank cells.

- KN199-04:
station 7 depth changed to 751 from 757
station 10 depth changed to 800 from 780
station 12 Wu depths were Measures' pressure, so I changed the numbers to match Measures depths, according to instructions from the PI.

Reference Concentrations

Data Files

File
Fe-Zn-Mn-Cd-Cu_GT10-11.csv (Comma Separated Values (.csv), 124.97 KB) MD5:e87769f4b188f054cd990dcbfe504c90 Primary data file for dataset ID 3861

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-0927558

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
KN199-04	GA03 GT10 USGT-NAT-2010 KN199-4 GNAT U.S. GEOTRACES NAZT Leg 1 knorr199-4/5 Section Cruise (GA03) 316N20101015	2010-10-15	R/V Knorr	William J. Jenkins (Chief Scientist) Edward A. Boyle (Co-Chief Scientist) Gregory A. Cutter (Co-Chief Scientist)	data info
KN204-01	GA03 GT11 KN204-01A KN204-01B USGT-NAT-2011 USGNAZT GNAT 316N20111106 KN204-1	2011-11-06	R/V Knorr	Edward A. Boyle (Chief Scientist) Gregory A. Cutter (Co-Chief Scientist)	data info

Instruments

GO-FLO Teflon Trace Metal Bottle

Supplied Name: GO-FLO Teflon Trace Metal

Supplied Description:

Teflon coated Go-Flo bottles attached to non-metallic rosette.

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: Isotope dilution -Inductively Coupled Plasma Mass Spectrometer

Supplied Description:

ID-ICPMS

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

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

Supplied Name	Supplied description	Supplied Units	Standard Name
cruise_name	local cruise name	dimensionless	cruise_name
cruise_id	cruise ID number	alphanumeric	cruise_id
station	station number within cruise	integer	station
lat_chsci	latitude provided by Chief Scientist - this is the nominal location of the data. For all lats north is positive.	decimal degrees	lat
lon_chsci	longitude provided by Chief Scientist - this is the nominal location of the data - theoretically these were the station locations given to the bridge. For all Lons west is negative.	decimal degrees	lon
lat_nom	when Chief Scientist was unable to provide the station list given to the bridge the locations of all the casts for this station were averaged and this is the mean latitude	decimal degrees	lat
lon_nom	see lat_nom	decimal degrees	lon
depth	depth the data were collected	meters	depth
Fe_average	average dissolved Iron concentration. Average of replicates.	nanoMoles	trace_metal_conc
Fe_stdev	standard deviation of dissolved iron concentration	nanoMoles	trace_metal_sd
Fe_blank	Iron concentration blank	nanoMoles	trace_metal_conc
Fe_blank_uncert	uncertainty in iron blank -- reported as blank plus or minus this number	nanoMoles	trace_metal_conc
Fe_flag	quality flag for the iron data - not a number - questionable or good.	alphanumeric	qflag
Fe_n	number of replicates	integer	num_reps
Zn_average	average dissolved Zinc concentration. Average of replicates.	nanoMoles	trace_metal_conc
Zn_stdev	standard deviation of dissolved zinc concentration	nanoMoles	trace_metal_sd
Zn_blank	Zinc concentration blank	nanoMoles	trace_metal_conc
Zn_blank_uncert	uncertainty in zinc blank -- reported as blank plus or minus this number	nanoMoles	trace_metal_conc
Zn_flag	quality flag for the zinc data - not a number - questionable or good.	alphanumeric	qflag
Zn_n	number of replicates	integer	num_reps
Mn_average	average dissolved Manganese concentration. Average of replicates.	nanoMoles	trace_metal_conc
Mn_stdev	standard deviation of dissolved manganese concentration	nanoMoles	trace_metal_sd
Mn_blank	Manganese concentration blank	nanoMoles	trace_metal_conc
Mn_blank_uncert	uncertainty in manganese blank -- reported as blank plus or minus this number	nanoMoles	trace_metal_conc
Mn_flag	quality flag for the manganese data - not a number - questionable or good.	alphanumeric	qflag
Mn_n	number of replicates	integer	num_reps
Cd_average	average dissolved Cadmium concentration. Average of replicates.	picoMoles	trace_metal_conc
Cd_stdev	standard deviation of dissolved cadmium concentration	picoMoles	trace_metal_sd
Cd_blank	Cadmium concentration blank	picoMoles	trace_metal_conc
Cd_blank_uncert	uncertainty in cadmium blank -- reported as blank plus or minus this number	picoMoles	trace_metal_conc
Cd_flag	quality flag for the cadmium data - not a number - questionable or good.	alphanumeric	qflag
Cd_n	number of replicates	integer	num_reps
Cu_average	average dissolved Copper concentration. Average of replicates.	nanoMoles	trace_metal_conc
Cu_stdev	standard deviation of dissolved copper concentration	nanoMoles	trace_metal_sd
Cu_blank	Copper concentration blank	nanoMoles	trace_metal_conc
Cu_blank_uncert	uncertainty in copper blank -- reported as blank plus or minus this number	nanoMoles	trace_metal_conc
Cu_flag	quality flag for the copper data - not a number - questionable or good.	alphanumeric	qflag
Cu_n	number of replicates	integer	num_reps
cruise_part	KN204-01A or KN204-01B	alphanumeric	cruise_id
lat	PI supplied lat - probably first cast latitude. North is positive.	decimal degrees	lat
lon	PI supplied lon - probably first cast longitude. West is negative	decimal degrees	lon
sample_GEOTRC	GEOTRACES sample number.	none	sample

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Dataset: GT10-11 - Fe Mn Zn Cd and Cu