http://lod.bco-dmo.org/id/dataset/818610
eng; USA
utf8
dataset
Highest level of data collection, from a common set of sensors or instrumentation, usually within the same research project
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
2020-07-15
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Dissolved Cobalt and Labile Cobalt from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018
2020-07-15
publication
2020-07-15
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2020-07-24
publication
https://doi.org/10.26008/1912/bco-dmo.818610.1
Mak A. Saito
Woods Hole Oceanographic Institution
principalInvestigator
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
publisher
Cite this dataset as: Saito, M. (2020) Dissolved Cobalt and Labile Cobalt from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2020-07-15 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.818610.1 [access date]
Dissolved Cobalt and Labile Cobalt from Leg 2 of the GP15 GEOTRACES Pacific Meridional Transect Dataset Description: Methods and Sampling: <p>North and equatorial Pacific seawater samples were collected on the GP15 expedition as part of the U.S. GEOTRACES program (RR1804 and RR1805, September to November 2018). Dissolved water samples were collected along a transect that mostly followed the 152W meridian from 76N to 20S, traveling from the Gulf of Alaska to Hawaii (Leg 1), and on to Tahiti, French Polynesia (Leg 2). Sampling locations included 20 deep full-depth stations with a bottom depth of over 4000 m, 5 shallow/coastal full-depth stations, and 10 surface stations where only the surface 1000 m was sampled.</p>
<p>Dissolved seawater samples were collected using a 24-bottle trace metal clean rosette equipped with 12 L Go-Flo bottles (General Oceanics), a titanium frame, and a Kevlar cable, as described in (Cutter and Bruland 2012). Surface water samples were collected from a trace metal clean towfish and pump while arriving at each station. Seawater from the Go-Flo bottles was subsampled in a trace metal clean van under positive pressure. Dissolved Co subsamples were filtered using a 0.2 um Acropack (Pall) and stored until analysis at 4 degrees C in a 60 mL LDPE bottle that had been soaked for ~1 week in Citranox, an acidic detergent, rinsed with Milli-Q water (Millipore), soaked for ~2 weeks in 10% trace metal grade HCl, and rinsed with lightly acidic Milli-Q water (&lt;0.1% HCl). All Co values were analyzed at sea, but replicates of all samples were taken for future dCo analysis in the laboratory. Preserved samples were filled entirely with no remaining headspace, stored with one oxygen-absorbing satchel (Mitsubishi Gas Chemical, model RP-3K) per 60 mL water sample, vacuum-sealed in plastic bags, and stored at 4 degrees C.</p>
<p>Dissolved cobalt was determined by cathodic stripping voltammetry (CSV) as originally described by (Saito and Moffett 2001) and modified by (Saito et al. 2010; Hawco et al. 2016). Measurement occurred shipboard within a trace metal clean plastic "bubble" within one week of sample collection using the Metrohm 663 VA and uAutolabIII systems equipped with a hanging mercury drop working electrode. For total dissolved Co (dCo) analysis, 0.2 um filtered water samples were UV-irradiated in acid-washed quartz tubes for one hour using a water-cooled UV irradiation system (Metrohm 705 UV Digestor) to destroy natural ligand-bound Co complexes. For labile dissolved Co analysis (L-dCo), no UV-irradiation was performed. Then, 11 mL of sample seawater was aliquoted into 15 mL acid-washed polypropylene vials, and 33 uL of 0.1 M dimethyglyoxime (DMG, Sigma Aldrich) and 130 uL of 0.5 M N-(2-hydroxyethyl)piperazine-N-(3-propanesulfonic acid) (EPPS, Sigma Aldrich) buffer was added. The samples were then processed on an autosampler (Metrohm 858 Sample Processor), which added 8.5 mL of the sample solution and 1.5 mL of a 1.5 M NaNO₂ reagent (Merck) to a Teflon cup for electrochemical analysis. The mercury electrode performed a fast linear sweep from -1.4 V to -0.6 V at a rate of 5 V s⁻¹, which reduced the Co bound in the Co(DMG)₂ complex from Co(II) to Co(0) and produced a Co reduction peak at -1.15 V (Saito and Moffett 2001) with a height linearly proportional to the amount of dCo present in the sample. A standard curve was created with 4 additions of 25 pM CoCl₂ to each sample, and a linear regression of the addition standard curve allowed for the calculation of the initial amount of Co present in the sample, assuming all available Co binds to the DMG ligand. Reagent purification protocols and standard addition calculations are outlined in more detail in (Saito and Moffett 2001). Triplicate technical replicates were run on every sample to determine the precision of the method, and duplicate depths from different rosette casts were run when available.</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1736599 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1736599
completed
Mak A. Saito
Woods Hole Oceanographic Institution
508-289-2393
266 Woods Hole Rd. MS #51 Watson Lab
Woods Hole
MA
02543
USA
msaito@whoi.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Station_ID
Start_Date_UTC
Start_Time_UTC
Start_ISO_DateTime_UTC
End_Date_UTC
End_Time_UTC
End_ISO_DateTime_UTC
Start_Latitude
Start_Longitude
End_Latitude
End_Longitude
Event_ID
Sample_ID
Sample_Depth
Co_D_CONC_BOTTLE_0vn2hs
SD1_Co_D_CONC_BOTTLE_0vn2hs
Flag_Co_D_CONC_BOTTLE_0vn2hs
L1Co_D_CONC_BOTTLE_mgxi4u
SD1_L1Co_D_CONC_BOTTLE_mgxi4u
Flag_L1Co_D_CONC_BOTTLE_mgxi4u
Co_D_CONC_FISH_r17gqs
SD1_Co_D_CONC_FISH_r17gqs
Flag_Co_D_CONC_FISH_r17gqs
L1Co_D_CONC_FISH_u2dkub
SD1_L1Co_D_CONC_FISH_u2dkub
Flag_L1Co_D_CONC_FISH_u2dkub
trace metal clean towfish
Go-Flo bottles
Metrohm 858 Sample Processor
Metrohm 663 VA
Metrohm 705 UV Digestor
µAutolabIII
theme
None, User defined
station
date
time of day
ISO_DateTime_UTC
latitude
longitude
event
sample identification
water pressure
trace metal concentration
quality flag
featureType
BCO-DMO Standard Parameters
GeoFish Towed near-Surface Sampler
GO-FLO Teflon Trace Metal Bottle
Laboratory Autosampler
Metrohm 663 VA Stand mercury electrode
UV Digester
Voltammetry Analyzers
instrument
BCO-DMO Standard Instruments
RR1815
service
Deployment Activity
Hilo, HI to Papeete, French Polynesia
place
Locations
otherRestrictions
otherRestrictions
Access Constraints: none. Use Constraints: Please follow guidelines at: http://www.bco-dmo.org/terms-use Distribution liability: Under no circumstances shall BCO-DMO be liable for any direct, incidental, special, consequential, indirect, or punitive damages that result from the use of, or the inability to use, the materials in this data submission. If you are dissatisfied with any materials in this data submission your sole and exclusive remedy is to discontinue use.
U.S. GEOTRACES
http://www.geotraces.org/
U.S. GEOTRACES
GEOTRACES is a SCOR sponsored program; and funding for program infrastructure development is provided by the U.S. National Science Foundation.
GEOTRACES gained momentum following a special symposium, S02: Biogeochemical cycling of trace elements and isotopes in the ocean and applications to constrain contemporary marine processes (GEOSECS II), at a 2003 Goldschmidt meeting convened in Japan. The GEOSECS II acronym referred to the Geochemical Ocean Section Studies To determine full water column distributions of selected trace elements and isotopes, including their concentration, chemical speciation, and physical form, along a sufficient number of sections in each ocean basin to establish the principal relationships between these distributions and with more traditional hydrographic parameters;
* To evaluate the sources, sinks, and internal cycling of these species and thereby characterize more completely the physical, chemical and biological processes regulating their distributions, and the sensitivity of these processes to global change; and
* To understand the processes that control the concentrations of geochemical species used for proxies of the past environment, both in the water column and in the substrates that reflect the water column.
GEOTRACES will be global in scope, consisting of ocean sections complemented by regional process studies. Sections and process studies will combine fieldwork, laboratory experiments and modelling. Beyond realizing the scientific objectives identified above, a natural outcome of this work will be to build a community of marine scientists who understand the processes regulating trace element cycles sufficiently well to exploit this knowledge reliably in future interdisciplinary studies.
Expand "Projects" below for information about and data resulting from individual US GEOTRACES research projects.
U.S. GEOTRACES
largerWorkCitation
program
US GEOTRACES Pacific Meridional Transect (GP15)
http://www.geotraces.org/
US GEOTRACES Pacific Meridional Transect (GP15)
<p>A 60-day research cruise took place in 2018 along a transect form Alaska to Tahiti at 152° W. A description of the project titled "<em>Collaborative Research: Management and implementation of the US GEOTRACES Pacific Meridional Transect</em>", funded by NSF, is below. Further project information is available on the <a href="https://www.geotraces.org/" target="_blank">US GEOTRACES website</a> and on the <a href="https://geotraces-gp15.com/" target="_blank">cruise blog</a>. A detailed <a href="https://datadocs.bco-dmo.org/docs/geotraces/GEOTRACES_PMT/casciotti/data_docs/GP15_Cruise_Report_with_ODF_Report.pdf" target="_blank">cruise report is also available</a> as a PDF.</p>
<p><em>Description from NSF award abstract:</em><br />
GEOTRACES is a global effort in the field of Chemical Oceanography in which the United States plays a major role. The goal of the GEOTRACES program is to understand the distributions of many elements and their isotopes in the ocean. Until quite recently, these elements could not be measured at a global scale. Understanding the distributions of these elements and isotopes will increase the understanding of processes that shape their distributions and also the processes that depend on these elements. For example, many "trace elements" (elements that are present in very low amounts) are also important for life, and their presence or absence can play a vital role in the population of marine ecosystems. This project will launch the next major U.S. GEOTRACES expedition in the Pacific Ocean between Alaska and Tahiti. The award made here would support all of the major infrastructure for this expedition, including the research vessel, the sampling equipment, and some of the core oceanographic measurements. This project will also support the personnel needed to lead the expedition and collect the samples.</p>
<p>This project would support the essential sampling operations and infrastructure for the U.S. GEOTRACES Pacific Meridional Transect along 152° W to support a large variety of individual science projects on trace element and isotope (TEI) biogeochemistry that will follow. Thus, the major objectives of this management proposal are: (1) plan and coordinate a 60 day research cruise in 2018; (2) obtain representative samples for a wide variety of TEIs using a conventional CTD/rosette, GEOTRACES Trace Element Sampling Systems, and in situ pumps; (3) acquire conventional CTD hydrographic data along with discrete samples for salinity, dissolved oxygen, algal pigments, and dissolved nutrients at micro- and nanomolar levels; (4) ensure that proper QA/QC protocols are followed and reported, as well as fulfilling all GEOTRACES intercalibration protocols; (5) prepare and deliver all hydrographic data to the GEOTRACES Data Assembly Centre (via the US BCO-DMO data center); and (6) coordinate all cruise communications between investigators, including preparation of a hydrographic report/publication. This project would also provide baseline measurements of TEIs in the Clarion-Clipperton fracture zone (~7.5°N-17°N, ~155°W-115°W) where large-scale deep sea mining is planned. Environmental impact assessments are underway in partnership with the mining industry, but the effect of mining activities on TEIs in the water column is one that could be uniquely assessed by the GEOTRACES community. In support of efforts to communicate the science to a wide audience the investigators will recruit an early career freelance science journalist with interests in marine science and oceanography to participate on the cruise and do public outreach, photography and/or videography, and social media from the ship, as well as to submit articles about the research to national media. The project would also support several graduate students.</p>
U.S. GEOTRACES PMT
largerWorkCitation
project
US GEOTRACES PMT: Cobalt Biogeochemical Cycling and Connections to Metalloenzymes in the Pacific Ocean
https://osprey.bco-dmo.org/project/785826
US GEOTRACES PMT: Cobalt Biogeochemical Cycling and Connections to Metalloenzymes in the Pacific Ocean
<p>NSF abstract:</p>
<p>Cobalt is important for many forms of marine life, yet it is one of the scarcest nutrients in the sea. Cobalt's oceanic abundance and distribution, along with other scarce nutrients, can influence the growth of microscopic plants (phytoplankton). This in turn can influence carbon cycles in the ocean and atmosphere. Therefore, knowledge of the controls on cobalt's abundance and chemical forms in seawater is a valuable component of our ability to understand the ocean's influence on global carbon cycling. Within phytoplankton and other marine microbes, metals such as cobalt, iron, nickel, and copper are used as critical components of enzymes responsible for key cellular reactions. Since these enzymes require metals to work, they are named metalloenzymes. Participating in a Pacific Ocean cruise from Alaska to Tahiti, this project will study the oceanic distributions of dissolved cobalt and the cellular content of a group of metalloenzymes known to influence biogeochemical cycles. The project will provide scientific impact by creating new knowledge about oceanic micronutrients in regions of economic interest with regard to fisheries and deep-sea mining. Measurement of proteins in the North Pacific will provide data of broad biological and chemical interest and will be made available through a new NSF-funded "EarthCube Ocean Protein Portal" data base. Educational impact will stem from participation of a graduate student and two young technicians, as well as the PI's development of a high school chemistry curriculum for use in two local high schools, thus allowing teachers to include real oceanic and environmental data at their first introduction to chemistry.</p>
<p>Cobalt has a complex biogeochemical cycle. Both its inorganic and organic forms are used by biology in the upper ocean and it is removed from solution by being scavenged in the intermediate and deep ocean. This scavenging removal results in cobalt having the smallest oceanic inventory of any biologically utilized element. Recent studies, however, have found that large dissolved cobalt plumes occur in major oxygen minimum zones due to a combination of less scavenging and additions from sedimentary and remineralization fluxes. The GP15 US GEOTRACES Pacific Meridional Transect (PMT) provides an opportunity to examine the influence of oxygen depletion on cobalt chemistry. Moreover, the study of the protein component of microbial communities using new proteomic techniques will provide evidence of how different major microorganisms respond to the chemical environment (e.g. through transporter production for specific nutrients and micronutrients) as well as the biochemical basis for metal requirements related to the use of specific metalloenzymes. Specifically, the PMT provides an opportunity to confirm that the Pacific oxygen minimum zones contain a large amount of cobalt and to test the hypotheses that simultaneous zinc scarcity could induce wide-scale biochemical substitution of cobalt for zinc in the North Pacific Ocean.</p>
PMT Cobalt and Metalloenzymes
largerWorkCitation
project
eng; USA
oceans
Hilo, HI to Papeete, French Polynesia
-155.258
-151.993
-20
18.907
2018-10-25
2018-11-22
From projects that focused on the following 2 locations: 1. Pacific Meridional Transect along 152W (GP15) 2. Laboratory Study and Cultures from Northeast Pacific Line P Transect 48.8167 N 128.667 W
0
BCO-DMO catalogue of parameters from Dissolved Cobalt and Labile Cobalt from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
http://lod.bco-dmo.org/id/dataset-parameter/818677.rdf
Name: Station_ID
Units: unitless
Description: <p>Station number</p>
http://lod.bco-dmo.org/id/dataset-parameter/818678.rdf
Name: Start_Date_UTC
Units: unitless
Description: <p>Sampling start date (UTC); format: MM-DD-YY</p>
http://lod.bco-dmo.org/id/dataset-parameter/818679.rdf
Name: Start_Time_UTC
Units: unitless
Description: <p>Sampling start time (UTC); format: hh:mm</p>
http://lod.bco-dmo.org/id/dataset-parameter/818680.rdf
Name: Start_ISO_DateTime_UTC
Units: yyyy-MM-dd'T'HH:mm'Z'
Description: <p>Sampling start date/time (UTC) formatted to ISO8601 standard: YYYY-MM-DDThh:mmZ</p>
http://lod.bco-dmo.org/id/dataset-parameter/818681.rdf
Name: End_Date_UTC
Units: unitless
Description: <p>Sampling end date (UTC); format: MM-DD-YY</p>
http://lod.bco-dmo.org/id/dataset-parameter/818682.rdf
Name: End_Time_UTC
Units: unitless
Description: <p>Sampling end time (UTC); format: hh:mm</p>
http://lod.bco-dmo.org/id/dataset-parameter/818683.rdf
Name: End_ISO_DateTime_UTC
Units: unitless
Description: <p>Sampling end date/time (UTC) formatted to ISO8601 standard: YYYY-MM-DDThh:mmZ</p>
http://lod.bco-dmo.org/id/dataset-parameter/818684.rdf
Name: Start_Latitude
Units: decimal degrees North
Description: <p>Sampling start latitude</p>
http://lod.bco-dmo.org/id/dataset-parameter/818685.rdf
Name: Start_Longitude
Units: decimal degrees East
Description: <p>Sampling start longitude</p>
http://lod.bco-dmo.org/id/dataset-parameter/818686.rdf
Name: End_Latitude
Units: decimal degrees North
Description: <p>Sampling end latitude</p>
http://lod.bco-dmo.org/id/dataset-parameter/818687.rdf
Name: End_Longitude
Units: decimal degrees East
Description: <p>Sampling end longitude</p>
http://lod.bco-dmo.org/id/dataset-parameter/818688.rdf
Name: Event_ID
Units: unitless
Description: <p>GEOTRACES event number</p>
http://lod.bco-dmo.org/id/dataset-parameter/818689.rdf
Name: Sample_ID
Units: unitless
Description: <p>GEOTRACES sample number</p>
http://lod.bco-dmo.org/id/dataset-parameter/818690.rdf
Name: Sample_Depth
Units: decibars
Description: <p>Sample/sensor pressure (CTDPRS)</p>
http://lod.bco-dmo.org/id/dataset-parameter/818691.rdf
Name: Co_D_CONC_BOTTLE_0vn2hs
Units: picomoles per kilogram (pmol/kg)
Description: <p>Concentration of dissolved Co (after UV oxidation) from Niskin</p>
http://lod.bco-dmo.org/id/dataset-parameter/818692.rdf
Name: SD1_Co_D_CONC_BOTTLE_0vn2hs
Units: picomoles per kilogram (pmol/kg)
Description: <p>One standard deviation of Co_D_CONC_BOTTLE_0vn2hs</p>
http://lod.bco-dmo.org/id/dataset-parameter/818693.rdf
Name: Flag_Co_D_CONC_BOTTLE_0vn2hs
Units: unitless
Description: <p>Quality flag for Co_D_CONC_BOTTLE_0vn2hs</p>
http://lod.bco-dmo.org/id/dataset-parameter/818694.rdf
Name: L1Co_D_CONC_BOTTLE_mgxi4u
Units: picomoles per kilogram (pmol/kg)
Description: <p>Concentration of dissolved labile Co from Niskin</p>
http://lod.bco-dmo.org/id/dataset-parameter/818695.rdf
Name: SD1_L1Co_D_CONC_BOTTLE_mgxi4u
Units: picomoles per kilogram (pmol/kg)
Description: <p>One standard deviation of L1Co_D_CONC_BOTTLE_mgxi4u</p>
http://lod.bco-dmo.org/id/dataset-parameter/818696.rdf
Name: Flag_L1Co_D_CONC_BOTTLE_mgxi4u
Units: unitless
Description: <p>Quality flag for L1Co_D_CONC_BOTTLE_mgxi4u</p>
http://lod.bco-dmo.org/id/dataset-parameter/818697.rdf
Name: Co_D_CONC_FISH_r17gqs
Units: picomoles per kilogram (pmol/kg)
Description: <p>Concentration of dissolved Co (after UV oxidation) from tow fish</p>
http://lod.bco-dmo.org/id/dataset-parameter/818698.rdf
Name: SD1_Co_D_CONC_FISH_r17gqs
Units: picomoles per kilogram (pmol/kg)
Description: <p>One standard deviation of Co_D_CONC_FISH_r17gqs</p>
http://lod.bco-dmo.org/id/dataset-parameter/818699.rdf
Name: Flag_Co_D_CONC_FISH_r17gqs
Units: unitless
Description: <p>Quality flag for Co_D_CONC_FISH_r17gqs</p>
http://lod.bco-dmo.org/id/dataset-parameter/818700.rdf
Name: L1Co_D_CONC_FISH_u2dkub
Units: picomoles per kilogram (pmol/kg)
Description: <p>Concentration of dissolved labile Co from tow fish</p>
http://lod.bco-dmo.org/id/dataset-parameter/818701.rdf
Name: SD1_L1Co_D_CONC_FISH_u2dkub
Units: picomoles per kilogram (pmol/kg)
Description: <p>One standard deviation of L1Co_D_CONC_FISH_u2dkub</p>
http://lod.bco-dmo.org/id/dataset-parameter/818702.rdf
Name: Flag_L1Co_D_CONC_FISH_u2dkub
Units: unitless
Description: <p>Quality flag for L1Co_D_CONC_FISH_u2dkub</p>
GB/NERC/BODC > British Oceanographic Data Centre, Natural Environment Research Council, United Kingdom
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
53900
https://darchive.mblwhoilibrary.org/bitstream/1912/25991/1/dataset-818610_gp15-dissolved-and-labile-cobalt-leg-2__v1.tsv
download
https://doi.org/10.26008/1912/bco-dmo.818610.1
download
onLine
dataset
<p>North and equatorial Pacific seawater samples were collected on the GP15 expedition as part of the U.S. GEOTRACES program (RR1804 and RR1805, September to November 2018). Dissolved water samples were collected along a transect that mostly followed the 152W meridian from 76N to 20S, traveling from the Gulf of Alaska to Hawaii (Leg 1), and on to Tahiti, French Polynesia (Leg 2). Sampling locations included 20 deep full-depth stations with a bottom depth of over 4000 m, 5 shallow/coastal full-depth stations, and 10 surface stations where only the surface 1000 m was sampled.</p>
<p>Dissolved seawater samples were collected using a 24-bottle trace metal clean rosette equipped with 12 L Go-Flo bottles (General Oceanics), a titanium frame, and a Kevlar cable, as described in (Cutter and Bruland 2012). Surface water samples were collected from a trace metal clean towfish and pump while arriving at each station. Seawater from the Go-Flo bottles was subsampled in a trace metal clean van under positive pressure. Dissolved Co subsamples were filtered using a 0.2 um Acropack (Pall) and stored until analysis at 4 degrees C in a 60 mL LDPE bottle that had been soaked for ~1 week in Citranox, an acidic detergent, rinsed with Milli-Q water (Millipore), soaked for ~2 weeks in 10% trace metal grade HCl, and rinsed with lightly acidic Milli-Q water (&lt;0.1% HCl). All Co values were analyzed at sea, but replicates of all samples were taken for future dCo analysis in the laboratory. Preserved samples were filled entirely with no remaining headspace, stored with one oxygen-absorbing satchel (Mitsubishi Gas Chemical, model RP-3K) per 60 mL water sample, vacuum-sealed in plastic bags, and stored at 4 degrees C.</p>
<p>Dissolved cobalt was determined by cathodic stripping voltammetry (CSV) as originally described by (Saito and Moffett 2001) and modified by (Saito et al. 2010; Hawco et al. 2016). Measurement occurred shipboard within a trace metal clean plastic "bubble" within one week of sample collection using the Metrohm 663 VA and uAutolabIII systems equipped with a hanging mercury drop working electrode. For total dissolved Co (dCo) analysis, 0.2 um filtered water samples were UV-irradiated in acid-washed quartz tubes for one hour using a water-cooled UV irradiation system (Metrohm 705 UV Digestor) to destroy natural ligand-bound Co complexes. For labile dissolved Co analysis (L-dCo), no UV-irradiation was performed. Then, 11 mL of sample seawater was aliquoted into 15 mL acid-washed polypropylene vials, and 33 uL of 0.1 M dimethyglyoxime (DMG, Sigma Aldrich) and 130 uL of 0.5 M N-(2-hydroxyethyl)piperazine-N-(3-propanesulfonic acid) (EPPS, Sigma Aldrich) buffer was added. The samples were then processed on an autosampler (Metrohm 858 Sample Processor), which added 8.5 mL of the sample solution and 1.5 mL of a 1.5 M NaNO₂ reagent (Merck) to a Teflon cup for electrochemical analysis. The mercury electrode performed a fast linear sweep from -1.4 V to -0.6 V at a rate of 5 V s⁻¹, which reduced the Co bound in the Co(DMG)₂ complex from Co(II) to Co(0) and produced a Co reduction peak at -1.15 V (Saito and Moffett 2001) with a height linearly proportional to the amount of dCo present in the sample. A standard curve was created with 4 additions of 25 pM CoCl₂ to each sample, and a linear regression of the addition standard curve allowed for the calculation of the initial amount of Co present in the sample, assuming all available Co binds to the DMG ligand. Reagent purification protocols and standard addition calculations are outlined in more detail in (Saito and Moffett 2001). Triplicate technical replicates were run on every sample to determine the precision of the method, and duplicate depths from different rosette casts were run when available.</p>
Specified by the Principal Investigator(s)
<p>Peak heights were determined by ElectroChemistry Data SOFTware (ECDSOFT v. 1.0.0.0).</p>
<p>Data were flagged using the SeaDataNet quality flag scheme. For more information on SeaDataNet flags, see: <a href="https://www.geotraces.org/geotraces-quality-flag-policy/" target="_blank">https://www.geotraces.org/geotraces-quality-flag-policy/</a> and <a href="https://www.seadatanet.org/Standards/Data-Quality-Control" target="_blank">https://www.seadatanet.org/Standards/Data-Quality-Control</a></p>
<p>SeaDataNet quality flag definitions:<br />
0 = No quality control;<br />
1 = Good value;<br />
2 = Probably good value;<br />
3 = Probably bad value;<br />
4 = Bad value;<br />
5 = Changed value;<br />
6 = Value below detection;<br />
7 = Value in excess;<br />
8 = Interpolated value;<br />
9 = Missing value;<br />
A = Value phenomenon uncertain.</p>
<p>BCO-DMO Processing:<br />
- renamed fields;<br />
- added date/time columns in ISO8601 format;<br />
- corrected erroneous year values to '2018'.</p>
Specified by the Principal Investigator(s)
asNeeded
7.x-1.1
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
trace metal clean towfish
trace metal clean towfish
PI Supplied Instrument Name: trace metal clean towfish PI Supplied Instrument Description:Surface water samples were collected from a trace metal clean towfish and pump while arriving at each station. Instrument Name: GeoFish Towed near-Surface Sampler Instrument Short Name:GeoFish Instrument Description: The GeoFish towed sampler is a custom designed near surface (2 meters or less) sampling system for the collection of trace metal clean seawater. It consists of a PVC encapsulated lead weighted torpedo and separate PVC depressor vane supporting the intake utilizing all PFA Teflon tubing connected to a deck mounted, air-driven, PFA Teflon dual-diaphragm pump which provides trace-metal clean seawater at up to 3.7L/min. The GeoFish is towed at up to 13kts off to the side of the vessel outside of the ship's wake to avoid possible contamination from the ship's hull. It was developed by Geoffrey Smith and Ken Bruland (University of California, Santa Cruz). Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/31/
Go-Flo bottles
Go-Flo bottles
PI Supplied Instrument Name: Go-Flo bottles PI Supplied Instrument Description:Dissolved seawater samples were collected using a 24-bottle trace metal clean rosette equipped with 12 L Go-Flo bottles (General Oceanics), a titanium frame and a Kevlar cable, as described in (Cutter and Bruland 2012). Instrument Name: GO-FLO Teflon Trace Metal Bottle Instrument Short Name:GO-FLO Teflon TM Instrument 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. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/30/
Metrohm 858 Sample Processor
Metrohm 858 Sample Processor
PI Supplied Instrument Name: Metrohm 858 Sample Processor PI Supplied Instrument Description:The samples were processed on an autosampler (Metrohm 858 Sample Processor), which added 8.5 mL of the sample solution and 1.5 mL of a 1.5 M NaNO2 reagent (Merck) to a Teflon cup for electrochemical analysis. Instrument Name: Laboratory Autosampler Instrument Short Name: Instrument Description: Laboratory apparatus that automatically introduces one or more samples with a predetermined volume or mass into an analytical instrument.
Metrohm 663 VA
Metrohm 663 VA
PI Supplied Instrument Name: Metrohm 663 VA PI Supplied Instrument Description:Measurement occurred shipboard within a trace metal clean plastic "bubble" within one week of sample collection using the Metrohm 663 VA and µAutolabIII systems equipped with a hanging mercury drop working electrode. Instrument Name: Metrohm 663 VA Stand mercury electrode Instrument Short Name:Metrohm 663 VA Instrument 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. Community Standard Description: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0515/
Metrohm 705 UV Digestor
Metrohm 705 UV Digestor
PI Supplied Instrument Name: Metrohm 705 UV Digestor PI Supplied Instrument Description:For total dissolved Co (dCo) analysis, 0.2 um filtered water samples were UV-irradiated in acid-washed quartz tubes for one hour using a water-cooled UV irradiation system (Metrohm 705 UV Digestor) to destroy natural ligand-bound Co complexes. Instrument Name: UV Digester Instrument Short Name: Instrument Description: Digestion instrument for UV photolysis of water samples
µAutolabIII
µAutolabIII
PI Supplied Instrument Name: µAutolabIII PI Supplied Instrument Description:Measurement occurred shipboard within a trace metal clean plastic "bubble" within one week of sample collection using the Metrohm 663 VA and µAutolabIII systems equipped with a hanging mercury drop working electrode. Instrument Name: Voltammetry Analyzers Instrument Short Name:Voltammetry Analyzers Instrument Description: Instruments that obtain information about an analyte by applying a potential and measuring the current produced in the analyte. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB35/
Cruise: RR1815
RR1815
R/V Roger Revelle
Community Standard Description
International Council for the Exploration of the Sea
R/V Roger Revelle
vessel
RR1815
Gregory A. Cutter
Old Dominion University
https://datadocs.bco-dmo.org/docs/geotraces/GEOTRACES_PMT/casciotti/data_docs/GP15_Cruise_Report_with_ODF_Report.pdf
Report describing RR1815
R/V Roger Revelle
Community Standard Description
International Council for the Exploration of the Sea
R/V Roger Revelle
vessel