Dataset: nutrients and metals

Name: Nutrients, cobalt, dissolved iron, and dissolved manganese from trace metal bottles from R/V Knorr cruise KN192-05 in the South Atlantic subtropical gyre and Benguela upwelling region in 2007 (CoFeMUG project)
Published: 2013-03-20
License: https://creativecommons.org/licenses/by/4.0/
Keywords: oceans

Cite This Dataset

Project:

Cobalt, Iron and Micro-organisms from the Upwelling zone to the Gyre (CoFeMUG)

Principal Investigator:

Mak A. Saito (Woods Hole Oceanographic Institution, WHOI)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version Date:

2013-03-20

Validated:

Yes

Current State:

Final no updates expected

Data URL:

https://www.bco-dmo.org/dataset/3233/data

Nutrients, cobalt, dissolved iron, and dissolved manganese from trace metal bottles from R/V Knorr cruise KN192-05 in the South Atlantic subtropical gyre and Benguela upwelling region in 2007 (CoFeMUG project)

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Description

Analysis of nutrients, Cobalt (total and labile), dissolved Iron, and dissolved Manganese of water samples drawn from Trace Metal Rosette (TMR) bottle casts.

Related Publications:
Noble, A.E, C. H. Lamborg, D. C. Ohnemus, P. J. Lam, T. J. Goepfert, C. I. Measures, C. H. Frame, K. L. Casciotti, G. R. DiTullio, J. Jennings, M. A. Saito. 2012. Basin-scale inputs of cobalt, iron, and manganese from the Benguela-Angola front to the South Atlantic Ocean. Limnology and Oceanography, 57(4) 989-1010. doi:10.4319/lo.2012.57.4.0989

Sohm, J. A., J. A. Hilton, A. E. Noble, J. P. Zehr, M. A. Saito, and E. A. Webb. 2011. Nitrogen fixation in the South Atlantic Gyre and the Benguela Upwelling System. Geophys. Res. Letters. 38: L16608, doi:10.1029/2011GL048315

Acquisition Description

Three transects were sampled using the Trace Metal Rosette (TMR) on the CoFeMUG cruise aboard R/V Knorr in 2007. Refer to Noble et al. (2012) for detailed information on acquisition and processing.

Nutrient Analyses: Technicon AutoAnalyzer II components were used to measure phophate and ammonium. Alpkem rapid flow analyzer (RFA) 300 components were used to measure silicic acid, nitrate+nitrite, and nitrite.

Cobalt Analyses: Total dissolved and labile cobalt concentrations were determined using cathodic stripping voltammetry, previously described by Saito and Moffet (2001) and Saito et al. (2004). Measurements were made using Eco-Chemie uAutolab-III systems connected to Metrohm 663 VA Stands with hanging mercury drop electrodes and Teflon sampling cups.

Iron and Manganese Analyses: Total dissolved iron and manganese concentrations were measured using inductively coupled plasma mass spectrometry (ICP-MS). SAFe seawater intercalibration standards were analyzed at the beginning of each analysis day with iron concentrations of 0.96 ± 0.095 nmol L-1 for D2 and 0.125 ± 0.046 nmol L-1 for S1 (n = 10), which are within the reported ranges of 0.91 + 0.17 nmol L-1 and 0.097 + 0.043 nmol L-1 (Johnson et al. 2007).

References:
Johnson, K.S. et al. 2007. Developing iron standards for seawater. EOS Trans. 88: 11, 131-132. doi: 10.1029/2007EO110003

Saito, M. A., and J. W. Moffett. 2001. Complexation of cobalt by natural organic ligands in the Sargasso Sea as determined by a new high-sensitivity electrochemical cobalt speciation method suitable for open ocean work. Marine Chemistry. 75 (49-68). doi: 10.1016/S0304-4203(01)00025-1.

Saito, M. A., J. W. Moffett, and G. DiTullio. 2004. Cobalt and Nickel in the Peru Upwelling Region: a Major Flux of Cobalt Utilized as a Micronutrient. Global Biogeochemical Cycles. 18 GB4030, doi: 10.1029/2003GB002216.

Processing Description

Asterisks next to some values for Fe and Mn denote samples where contamination is suspected. Quality flags indicate values below detection limits and potentially erroneous data according to the codes below.

Quality Flag Codes:
0 = no quality control = No quality control procedures have been applied to the data value. This is the initial status for all data values entering the working archive.
1 = good value = Good quality data value that is not part of any identified malfunction and has been verified as consistent with real phenomena during the quality control process.
2 = probably good value = Data value that is probably consistent with real phenomena but this is unconfirmed or data value forming part of a malfunction that is considered too small to affect the overall quality of the data object of which it is a part.
3 = probably bad value = Data value recognized as unusual during quality control that forms part of a feature that is probably inconsistent with real phenomena.
4 = bad value = An obviously erroneous data value.
5 = changed value = Data value adjusted during quality control. Best practice strongly recommends that the value before the change be preserved in the data or its accompanying metadata.
6 = value below detection = The level of the measured phenomenon was too small to be quantified by the technique employed to measure it. The accompanying value is the detection limit for the technique or zero if that value is unknown.
7 = missing = Bottle didn't trip or sample wasn't taken.

BCO-DMO Processing Notes:
-Modified original parameter names to conform with BCO-DMO naming conventions;
-Missing values (blank) were replaced with 'nd' to indicate 'no data'.
History:
7 October 2009 - nutrients and preliminary Co data submitted to BCO-DMO; awaiting documentation from originating PI.
February 2010 - units for nutrient data confirmed to be micromolar; Cobalt measurements will be added in the future and are picomolar.
20 March 2013 - Co, Fe, Mn data submitted and joined to nutrients. Quality flags were also added by investigator.

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-0452883

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
KN192-05	CoFeMUG KN192-5	2007-11-16	R/V Knorr	Mak A. Saito (Chief Scientist)	data info

Instruments

Metrohm 663 VA Stand mercury electrode

(more info)

Short Name: Metrohm 663 VA

Community Standard Description

Generic Description

The Metrohm 663 VA stand forms the wet chemical part of a polarographic and voltammetric analytical system. It features a mercury electrode, an Ag/AgCl reference electrode and a glassy carbon counter electrode. The size of the mercury drop and the stirrer speed are set manually on the VA Stand. The VA Stand can be operated in Dropping Mercury Electrode (DME), Hanging Mercury Drop Electrode (HMDE) and Static Mercury Drop Electrode (SMDE) modes. The VA Stand can be controlled by a potentiostat in conjunction with the Metrohm IME663 interface.

PI supplied instrument name: Metrohm 663 VA Stand mercury electrode

Dataset-specific description

Nutrient Autoanalyzer

(more info)

Short Name: Nutrient Autoanalyzer

Community Standard Description

Generic Description

Nutrient Autoanalyzer is a generic term used when specific type, make and model were not specified. In general, a Nutrient Autoanalyzer is an automated flow-thru system for doing nutrient analysis (nitrate, ammonium, orthophosphate, and silicate) on seawater samples.

PI supplied instrument name: Nutrient Autoanalyzer

Dataset-specific description

Technicon AutoAnalyzer II components and Alpkem rapid flow analyzer (RFA) 300 componentswere used to measure nutrients.

Trace Metal Bottle

(more info)

Short Name: TM Bottle

Community Standard Description

Generic Description

Trace metal (TM) clean rosette bottle used for collecting trace metal clean seawater samples.

PI supplied instrument name: Trace Metal Bottle

Dataset-specific description

Trace Metal Rosette (11 bottle) plus CTD

Voltammetry Analyzers

(more info)

Short Name: Voltammetry Analyzers

Community Standard Description

Generic Description

Instruments that obtain information about an analyte by applying a potential and measuring the current produced in the analyte.

PI supplied instrument name: Voltammetry Analyzers

Dataset-specific description

Eco-Chemie uAutolab-III systems were used.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
cruise_id	Ship's cruise designation	dimensionless	cruise_id
sta	Station number	dimensionless	sta
cast	Cast number	dimensionless	cast
date	date; reported in GMT as YYYYMMDD (year; month; day)	YYYYMMDD	date
year	year, reported as YYYY	YYYY	year
mon	month of year; numeric 1 to 12	MM	month
day	day of month; numeric 1 to 31	DD	day
time	time of day; reported in GMT as hhmm	hhmm	time
lon_360	longitude ranging from 0 to 360 degrees	decimal degrees	lon_360
lon	longitude; East is positive, West is negative	decimal degrees	lon
lat	latitude; North is positive, South is negative	decimal degrees	lat
depth_w	water depth, in meters	meters	depth_w
depth	Sample depth	meters	depth
PO4	Phosphate concentration in uM.	micromolar	PO4
NO3_NO2	Nitrate plus nitrite concentration in uM. (Originally named 'N+N'.)	micromolar	NO3_NO2
SiO4	Silicate (Orthosilicic Acid) concentration in uM.	micromolar	Silicate
NO2	Nitrite concentration in uM.	micromolar	NO2
NH4	Ammonium concentration in uM.	micromolar	NH4
run_id	run ID of sample	dimensionless	unknown
ev_code	event code; type and number of sampling event; matches cruise event log	dimensionless	ev_code
Co_tot	Total Cobalt concentration in pM. (Originally named 'TCo'.)	picomolar	trace_metal_conc
Co_labile	Concentration of labile Cobalt in pM. (Originally named Co'.) Note: lt_0.75 = less than 0.75.	picomolar	trace_metal_conc
Fe_Td	Total dissolved Iron concentration in nM.	nanomolar	trace_metal_conc
Mn_Td	Total dissolved Manganese concentration in nM.	nanomolar	trace_metal_conc
NO3_NO2_flag	Quality flag for NO3_NO2. See 'Processing Description' for code definitions.	dimensionless	q_flag
PO4_flag	Quality flag for PO4. See 'Processing Description' for code definitions.	dimensionless	q_flag
SiO4_flag	Quality flag for SiO4. See 'Processing Description' for code definitions.	dimensionless	q_flag
NO2_flag	Quality flag for NO2. See 'Processing Description' for code definitions.	dimensionless	q_flag
NH4_flag	Quality flag for NH4. See 'Processing Description' for code definitions.	dimensionless	q_flag
Co_tot_flag	Quality flag for Co_tot. See 'Processing Description' for code definitions.	dimensionless	q_flag
Co_labile_flag	Quality flag for Co_labile. See 'Processing Description' for code definitions.	dimensionless	q_flag
Fe_Td_flag	Quality flag for Fe_Td. See 'Processing Description' for code definitions.	dimensionless	q_flag
Mn_Td_flag	Quality flag for Mn_Td. See 'Processing Description' for code definitions.	dimensionless	q_flag
ISO_DateTime_UTC	Date/Time (UTC) formatted to ISO8601 standard. T indicates start of time string; Z indicates UTC. Generated from original date and time fields.	YYYY-mm-ddTHH:MM:SS.ssZ	ISO_DateTime_UTC

Database

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Dataset: nutrients and metals