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Title Sum-
Institution Dataset ID
   set  data   graph     files  public Surface transects for arsenic speciation, antimony speciation, and alkaline phosphatase
activity from R/V Knorr cruise KN204-01 in the Subtropical North Atlantic Ocean in 2011 (U.S.
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The Dataset's Variables and Attributes

Row Type Variable Name Attribute Name Data Type Value
attribute NC_GLOBAL access_formats String .htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson
attribute NC_GLOBAL acquisition_description String Filtered (0.4 micromole) water samples from the Geotraces surface tow-fish
taken at discrete times were placed into 500 mL Teflon FEP bottles,
refrigerated, and analyzed within 24 hours of collection. Arsenic and antimony
speciation determined using selective hydride generation, liquid nitrogen-
cooled trapping, and then revolatilization and determination with gas
chromatography/photoionization detection (Cutter et al., 1991; Cutter and
Cutter, 2006).

Calibration performed daily via the standard additions method, with a minimum
of 4 additions of AsIII, AsV, MMAs, or DMAs depending on the analyses. The
slope from the linear fit to these data was then applied to all samples for
that day. Detection limits were 25 pmol/L for As(III) and As(III+V), and 50
pmol/L for MMAs and DMAs. Precision was better than 8% (relative standard
deviation) for all As species. Alkaline phosphatase enzyme activity was
measured using the fluorescence method of Ammerman (1993).
attribute NC_GLOBAL awards_0_award_nid String 54753
attribute NC_GLOBAL awards_0_award_number String OCE-0926423
attribute NC_GLOBAL awards_0_data_url String http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=0926423 (external link)
attribute NC_GLOBAL awards_0_funder_name String NSF Division of Ocean Sciences
attribute NC_GLOBAL awards_0_funding_acronym String NSF OCE
attribute NC_GLOBAL awards_0_funding_source_nid String 355
attribute NC_GLOBAL awards_0_program_manager String Donald L. Rice
attribute NC_GLOBAL awards_0_program_manager_nid String 51467
attribute NC_GLOBAL awards_1_award_nid String 54938
attribute NC_GLOBAL awards_1_award_number String OCE-0926092
attribute NC_GLOBAL awards_1_data_url String http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=0926092 (external link)
attribute NC_GLOBAL awards_1_funder_name String NSF Division of Ocean Sciences
attribute NC_GLOBAL awards_1_funding_acronym String NSF OCE
attribute NC_GLOBAL awards_1_funding_source_nid String 355
attribute NC_GLOBAL awards_1_program_manager String Donald L. Rice
attribute NC_GLOBAL awards_1_program_manager_nid String 51467
attribute NC_GLOBAL cdm_data_type String Other
attribute NC_GLOBAL comment String Version: 03 January 2013
PI: Cutter

KN204-01,A/B surface transects from tow-fish
for arsenic speciation and alkaline phosphatase activity

Please note that data may not be final, pending intercalibration results and
further analysis. If you are interested in following changes to US GEOTRACES
NAT data, there is an RSS feed available via the BCO-DMO US GEOTRACES
<a href="https://www.bco-dmo.org/project/2066" target="_blank">project page</a>.
attribute NC_GLOBAL Conventions String COARDS, CF-1.6, ACDD-1.3
attribute NC_GLOBAL creator_email String info at bco-dmo.org
attribute NC_GLOBAL creator_name String BCO-DMO
attribute NC_GLOBAL creator_type String institution
attribute NC_GLOBAL creator_url String https://www.bco-dmo.org/ (external link)
attribute NC_GLOBAL data_source String extract_data_as_tsv version 2.3 19 Dec 2019
attribute NC_GLOBAL date_created String 2012-12-31T20:08:39Z
attribute NC_GLOBAL date_modified String 2020-04-10T19:14:34Z
attribute NC_GLOBAL defaultDataQuery String &amp;time&lt;now
attribute NC_GLOBAL doi String 10.26008/1912/bco-dmo.3830.1
attribute NC_GLOBAL Easternmost_Easting double -24.5337
attribute NC_GLOBAL geospatial_lat_max double 38.6944
attribute NC_GLOBAL geospatial_lat_min double 17.417
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_max double -24.5337
attribute NC_GLOBAL geospatial_lon_min double -69.8106
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL infoUrl String https://www.bco-dmo.org/dataset/3830 (external link)
attribute NC_GLOBAL institution String BCO-DMO
attribute NC_GLOBAL instruments_0_acronym String GeoFish
attribute NC_GLOBAL instruments_0_dataset_instrument_nid String 5971
attribute NC_GLOBAL instruments_0_description String The GeoFish towed sampler is a custom designed near surface (
attribute NC_GLOBAL instruments_0_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/31/ (external link)
attribute NC_GLOBAL instruments_0_instrument_name String GeoFish Towed near-Surface Sampler
attribute NC_GLOBAL instruments_0_instrument_nid String 549
attribute NC_GLOBAL instruments_0_supplied_name String GeoFish
attribute NC_GLOBAL instruments_1_acronym String TUV
attribute NC_GLOBAL instruments_1_dataset_instrument_nid String 6018
attribute NC_GLOBAL instruments_1_description String A towed undulating vehicle is a generic class of instruments. See the data set specific information for a detailed description. These are often prototype instrument packages designed to make very specific measurements.
attribute NC_GLOBAL instruments_1_instrument_name String towed undulating vehicle
attribute NC_GLOBAL instruments_1_instrument_nid String 604
attribute NC_GLOBAL instruments_1_supplied_name String towed undulating vehicle
attribute NC_GLOBAL instruments_2_acronym String Gas Chromatograph
attribute NC_GLOBAL instruments_2_dataset_instrument_nid String 5972
attribute NC_GLOBAL instruments_2_description String Instrument separating gases, volatile substances, or substances dissolved in a volatile solvent by transporting an inert gas through a column packed with a sorbent to a detector for assay. (from SeaDataNet, BODC)
attribute NC_GLOBAL instruments_2_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/LAB02/ (external link)
attribute NC_GLOBAL instruments_2_instrument_name String Gas Chromatograph
attribute NC_GLOBAL instruments_2_instrument_nid String 661
attribute NC_GLOBAL instruments_2_supplied_name String Gas Chromatograph
attribute NC_GLOBAL keywords String AP_Turnover_Rate, AP_Turnover_Time, AsIII, bco, bco-dmo, biological, chemical, cruise, cruise_id, cruise_part, data, dataset, date, dmas, dmo, erddap, geofish, geofish_station, iii, latitude, longitude, management, mmas, oceanography, office, part, preliminary, rate, station, tas, time, time2, turnover
attribute NC_GLOBAL license String https://www.bco-dmo.org/dataset/3830/license (external link)
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/3830 (external link)
attribute NC_GLOBAL Northernmost_Northing double 38.6944
attribute NC_GLOBAL param_mapping String {'3830': {'lat': 'master - latitude', 'lon': 'master - longitude'}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/3830/parameters (external link)
attribute NC_GLOBAL people_0_affiliation String Old Dominion University
attribute NC_GLOBAL people_0_affiliation_acronym String ODU
attribute NC_GLOBAL people_0_person_name String Gregory Cutter
attribute NC_GLOBAL people_0_person_nid String 50679
attribute NC_GLOBAL people_0_role String Principal Investigator
attribute NC_GLOBAL people_0_role_type String originator
attribute NC_GLOBAL people_1_affiliation String Leibniz Institute for Baltic Sea Research Warnemunde Germany
attribute NC_GLOBAL people_1_person_name String Oliver Wurl
attribute NC_GLOBAL people_1_person_nid String 51337
attribute NC_GLOBAL people_1_role String Contact
attribute NC_GLOBAL people_1_role_type String related
attribute NC_GLOBAL people_2_affiliation String Woods Hole Oceanographic Institution
attribute NC_GLOBAL people_2_affiliation_acronym String WHOI BCO-DMO
attribute NC_GLOBAL people_2_person_name String Theresa McKee
attribute NC_GLOBAL people_2_person_nid String 51103
attribute NC_GLOBAL people_2_role String BCO-DMO Data Manager
attribute NC_GLOBAL people_2_role_type String related
attribute NC_GLOBAL project String U.S. GEOTRACES NAT
attribute NC_GLOBAL projects_0_acronym String U.S. GEOTRACES NAT
attribute NC_GLOBAL projects_0_description String Much of this text appeared in an article published in OCB News, October 2008, by the OCB Project Office.
The first U.S. GEOTRACES Atlantic Section will be specifically centered around a sampling cruise to be carried out in the North Atlantic in 2010. Ed Boyle (MIT) and Bill Jenkins (WHOI) organized a three-day planning workshop that was held September 22-24, 2008 at the Woods Hole Oceanographic Institution. The main goal of the workshop, sponsored by the National Science Foundation and the U.S. GEOTRACES Scientific Steering Committee, was to design the implementation plan for the first U.S. GEOTRACES Atlantic Section. The primary cruise design motivation was to improve knowledge of the sources, sinks and internal cycling of Trace Elements and their Isotopes (TEIs) by studying their distributions along a section in the North Atlantic (Figure 1). The North Atlantic has the full suite of processes that affect TEIs, including strong meridional advection, boundary scavenging and source effects, aeolian deposition, and the salty Mediterranean Outflow. The North Atlantic is particularly important as it lies at the "origin" of the global Meridional Overturning Circulation.
It is well understood that many trace metals play important roles in biogeochemical processes and the carbon cycle, yet very little is known about their large-scale distributions and the regional scale processes that affect them. Recent advances in sampling and analytical techniques, along with advances in our understanding of their roles in enzymatic and catalytic processes in the open ocean provide a natural opportunity to make substantial advances in our understanding of these important elements. Moreover, we are motivated by the prospect of global change and the need to understand the present and future workings of the ocean's biogeochemistry. The GEOTRACES strategy is to measure a broad suite of TEIs to constrain the critical biogeochemical processes that influence their distributions. In addition to these "exotic" substances, more traditional properties, including macronutrients (at micromolar and nanomolar levels), CTD, bio-optical parameters, and carbon system characteristics will be measured. The cruise starts at Line W, a repeat hydrographic section southeast of Cape Cod, extends to Bermuda and subsequently through the North Atlantic oligotrophic subtropical gyre, then transects into the African coast in the northern limb of the coastal upwelling region. From there, the cruise goes northward into the Mediterranean outflow. The station locations shown on the map are for the "fulldepth TEI" stations, and constitute approximately half of the stations to be ultimately occupied.
Figure 1. The proposed 2010 Atlantic GEOTRACES cruise track plotted on dissolved oxygen at 400 m depth. Data from the World Ocean Atlas (Levitus et al., 2005) were plotted using Ocean Data View (courtesy Reiner Schlitzer). [click on the image to view a larger version]
Hydrography, CTD and nutrient measurements will be supported by the Ocean Data Facility (J. Swift) at Scripps Institution of Oceanography and funded through NSF Facilities. They will be providing an additional CTD rosette system along with nephelometer and LADCP. A trace metal clean Go-Flo Rosette and winch will be provided by the group at Old Dominion University (G. Cutter) along with a towed underway pumping system.
The North Atlantic Transect cruise began in 2010 with KN199 leg 4 (station sampling) and leg 5 (underway sampling only) (Figure 2).
KN199-04 Cruise Report (PDF)
Figure 2. The red line shows the cruise track for the first leg of the US Geotraces North Atlantic Transect on the R/V Knorr in October 2010.  The rest of the stations (beginning with 13) will be completed in October-December 2011 on the R/V Knorr (courtesy of Bill Jenkins, Chief Scientist, GNAT first leg). [click on the image to view a larger version]
The section completion effort resumed again in November 2011 with KN204-01A,B (Figure 3).
KN204-01A,B Cruise Report (PDF)
Figure 3. Station locations occupied on the US Geotraces North Atlantic Transect on the R/V Knorr in November 2011.  [click on the image to view a larger version]
Data from the North Atlantic Transect cruises are available under the Datasets heading below, and consensus values for the SAFe and North Atlantic GEOTRACES Reference Seawater Samples are available from the GEOTRACES Program Office: Standards and Reference Materials
ADCP data are available from the Currents ADCP group at the University of Hawaii at the links below:KN199-04   (leg 1 of 2010 cruise; Lisbon to Cape Verde)KN199-05   (leg 2 of 2010 cruise; Cape Verde to Charleston, NC)KN204-01A (part 1 of 2011 cruise; Woods Hole, MA to Bermuda)KN204-01B (part 2 of 2011 cruise; Bermuda to Cape Verde)
attribute NC_GLOBAL projects_0_end_date String 2013-08
attribute NC_GLOBAL projects_0_geolocation String Subtropical western and eastern North Atlantic Ocean
attribute NC_GLOBAL projects_0_name String U.S. GEOTRACES North Atlantic Transect
attribute NC_GLOBAL projects_0_project_nid String 2066
attribute NC_GLOBAL projects_0_project_website String http://www.geotraces.org/ (external link)
attribute NC_GLOBAL projects_0_start_date String 2010-10
attribute NC_GLOBAL publisher_name String Biological and Chemical Oceanographic Data Management Office (BCO-DMO)
attribute NC_GLOBAL publisher_type String institution
attribute NC_GLOBAL sourceUrl String (local files)
attribute NC_GLOBAL Southernmost_Northing double 17.417
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v55
attribute NC_GLOBAL subsetVariables String cruise_id
attribute NC_GLOBAL summary String Surface transects for arsenic speciation, antimony speciation, and alkaline phosphatase activity. Data for the concentrations of the dissolved (<0.4 \u00b5m) arsenic species: total inorganic As (III+V), arsenite (AsIII), As(V), monomethyl As, dimethyl As, and the activity of the enzyme alkaline phosphatase (unfiltered).
attribute NC_GLOBAL title String Surface transects for arsenic speciation, antimony speciation, and alkaline phosphatase activity from R/V Knorr cruise KN204-01 in the Subtropical North Atlantic Ocean in 2011 (U.S. GEOTRACES NAT project)
attribute NC_GLOBAL version String 1
attribute NC_GLOBAL Westernmost_Easting double -69.8106
attribute NC_GLOBAL xml_source String osprey2erddap.update_xml() v1.3
variable cruise_id   String  
attribute cruise_id bcodmo_name String cruise_id
attribute cruise_id description String cruise id
attribute cruise_id long_name String Cruise Id
attribute cruise_id units String text
variable cruise_part   String  
attribute cruise_part bcodmo_name String cruise_part
attribute cruise_part description String Identifier for a segment of a leg of a cruise, where a leg may have been broken into parts.
attribute cruise_part long_name String Cruise Part
attribute cruise_part units String dimensionless
variable geofish_station   String  
attribute geofish_station bcodmo_name String geofish_station
attribute geofish_station description String towed fish station
attribute geofish_station long_name String Geofish Station
attribute geofish_station units String text
variable date   int  
attribute date _FillValue int 2147483647
attribute date actual_range int 20111108, 20111209
attribute date bcodmo_name String date
attribute date description String Date in the format YYYYMMDD
attribute date long_name String Date
attribute date nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/ (external link)
attribute date units String unitless
variable time2   String  
attribute time2 bcodmo_name String time
attribute time2 description String Time
attribute time2 long_name String Time
attribute time2 nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/AHMSAA01/ (external link)
attribute time2 units String HHMM
variable latitude   double  
attribute latitude _CoordinateAxisType String Lat
attribute latitude _FillValue double NaN
attribute latitude actual_range double 17.417, 38.6944
attribute latitude axis String Y
attribute latitude bcodmo_name String latitude
attribute latitude colorBarMaximum double 90.0
attribute latitude colorBarMinimum double -90.0
attribute latitude description String Latitude (South is negative)
attribute latitude ioos_category String Location
attribute latitude long_name String Latitude
attribute latitude nerc_identifier String https://vocab.nerc.ac.uk/collection/P09/current/LATX/ (external link)
attribute latitude standard_name String latitude
attribute latitude units String degrees_north
variable longitude   double  
attribute longitude _CoordinateAxisType String Lon
attribute longitude _FillValue double NaN
attribute longitude actual_range double -69.8106, -24.5337
attribute longitude axis String X
attribute longitude bcodmo_name String longitude
attribute longitude colorBarMaximum double 180.0
attribute longitude colorBarMinimum double -180.0
attribute longitude description String Longitude (West is negative)
attribute longitude ioos_category String Location
attribute longitude long_name String Longitude
attribute longitude nerc_identifier String https://vocab.nerc.ac.uk/collection/P09/current/LONX/ (external link)
attribute longitude standard_name String longitude
attribute longitude units String degrees_east
variable AsIII   float  
attribute AsIII _FillValue float NaN
attribute AsIII actual_range float 0.0, 5.44
attribute AsIII bcodmo_name String unknown
attribute AsIII description String Arsenite (HAsO32-)
attribute AsIII long_name String As III
attribute AsIII units String nmol/L
variable TAs   float  
attribute TAs _FillValue float NaN
attribute TAs actual_range float 2.69, 32.71
attribute TAs bcodmo_name String unknown
attribute TAs description String Total inorganic arsenic (AsIII+V)
attribute TAs long_name String TAs
attribute TAs units String nmol/L
variable As   float  
attribute As _FillValue float NaN
attribute As actual_range float 2.12, 31.82
attribute As bcodmo_name String arsenic
attribute As description String Arsenic As(V)
attribute As long_name String As
attribute As units String nanomoles/liter
variable MMAs   float  
attribute MMAs _FillValue float NaN
attribute MMAs actual_range float 0.01, 1.42
attribute MMAs bcodmo_name String unknown
attribute MMAs description String Monomethyl arsenic
attribute MMAs long_name String MMAs
attribute MMAs units String nmol/L
variable DMAs   float  
attribute DMAs _FillValue float NaN
attribute DMAs actual_range float 0.03, 34.67
attribute DMAs bcodmo_name String unknown
attribute DMAs description String Dimethyl arsenic
attribute DMAs long_name String DMAs
attribute DMAs units String nmol/L
variable AP_Turnover_Time   float  
attribute AP_Turnover_Time _FillValue float NaN
attribute AP_Turnover_Time actual_range float 0.2, 3.72
attribute AP_Turnover_Time bcodmo_name String unknown
attribute AP_Turnover_Time description String Alkaline phosphatase turnover time
attribute AP_Turnover_Time long_name String AP Turnover Time
attribute AP_Turnover_Time units String hours
variable AP_Turnover_Rate   float  
attribute AP_Turnover_Rate _FillValue float NaN
attribute AP_Turnover_Rate actual_range float 0.0023, 0.0759
attribute AP_Turnover_Rate bcodmo_name String unknown
attribute AP_Turnover_Rate description String Alkaline phosphatase turnover rate
attribute AP_Turnover_Rate long_name String AP Turnover Rate
attribute AP_Turnover_Rate units String h-1

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.

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