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Title Sum-
Institution Dataset ID
   set  data   graph     files  public Concentration measurements of water column phosphate, nitrate and nitrite, dissolved organic
phosphorus, methane, and ethylene from samples collected during the R/V Neil Armstrong cruise
AR16 in the western North Atlantic Ocean in May 2017
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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,.odvTxt
attribute NC_GLOBAL acquisition_description String Sampling was conducted aboard the R/V Neil Armstrong (cruise AR16) in May
2017. Seawater was collected from Niskin bottles deployed on a rosette with a

Samples for seawater methane (CH4) and ethylene (C2H4) concentration
measurements were collected from the CTD rosette in 250 mL glass serum vials
(pre-combusted) crimp-sealed with aluminum collars and with Teflon-lined
septa. Samples were typically analyzed the same day of sampling aboard the R/V
Armstrong with an Agilent 7980A gas chromatograph equipped with a flame
ionization detector (FID) and a gas stripping and cryo-trap concentration
method as described previously (Repeta et al. 2016). The FID was calibrated by
injecting different sized loops of a gas mixture standard containing 10 ppm of
CH4 and C2H4 in pure nitrogen gas (Scott-Marrin, Riverside, CA, USA).

Samples for nutrient analyses were collected in acid-clean HDPE plastic
bottles. Samples were shipped frozen to the Center for Microbial Oceanography:
Research and Education at the University of Hawaii at Manoa where they were
stored frozen until analysis.

Seawater phosphate (PO4) concentrations were determined following the
autoanalyzer colorimetric procedure of Foreman et al. (2019). Seawater
nitrate+nitrite (NOx) concentrations were determined following the
autoanalyzer colorimetric procedure outlined of Foreman et al. (2016). Both
PO4 and NOx analyses were performed on a SEAL Analytics autoanalyzer model 3

Seawater samples with low level N+N (LLN) concentrations were measured using
the modified chemiluminescent method based on titanium (III) trichloride
reduction of N+N to nitric oxide gas and detection with an Antek model 7090 as
described by Foreman et al. (2016).

MAGIC soluble reactive phosphorus (SRP) concentrations (i.e. phosphate) were
determined in seawater samples using the MAGnesium Induced Coprecipitation
(MAGIC) technique as described by Karl and Tien (1992) with modifications
based on Thompson-Bulldis and Karl (1998) and Cavendar-Bares et al. (2001) to
increase the concentration factor of phosphate. Specifically, SRP was
concentrated from 150 mL sweater samples using 0.75 mL (0.5% v/v) of 1M NaOH
to precipitate Mg(OH)\u2082 and the Mg(OH)\u2082 pellets were dissolved with
5.25 mL of 0.1M HCl.

Total dissolved P (TDP) concentrations were measured by a photo-oxidation
procedure in which controlled exposure to ultraviolet (UV) radiation converts
organic P in seawater to phosphate which is then measured by the modified
molybdenum blue method adapted for the autoanalyzer technique. The UV photo-
oxidation methodology for TDP analysis is described in Foreman et al. (2019).
The difference between TDP and PO4 or TDP and SRP is calculated to estimate
the concentration of dissolved organic phosphorus (DOP) in seawater.
attribute NC_GLOBAL awards_0_award_nid String 765013
attribute NC_GLOBAL awards_0_award_number String OCE-1634080
attribute NC_GLOBAL awards_0_data_url String http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1634080 (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 Dr Simone Metz
attribute NC_GLOBAL awards_0_program_manager_nid String 51479
attribute NC_GLOBAL cdm_data_type String Other
attribute NC_GLOBAL comment String Water column methane, ethylene, and corresponding nutrients from R/V Armstrong cruise AR16
PI: Daniel J. Repeta (WHOI)
Co-PIs: David M. Karl (University of Hawaii)
Version date hisotry:
19 July 2019 (current) - version 2; detection limits of ethylene gas were re-calculated.
11 June 2019 - version 1; original submission.

Note: nd = not determined; bdl = below detection limit.
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 2019-05-31T16:07:12Z
attribute NC_GLOBAL date_modified String 2019-07-22T17:48:47Z
attribute NC_GLOBAL defaultDataQuery String &time<now
attribute NC_GLOBAL doi String 10.1575/1912/bco-dmo.769203.2
attribute NC_GLOBAL Easternmost_Easting double -64.1875
attribute NC_GLOBAL geospatial_lat_max double 40.4025
attribute NC_GLOBAL geospatial_lat_min double 29.05817
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_max double -64.1875
attribute NC_GLOBAL geospatial_lon_min double -71.33867
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL geospatial_vertical_max double 1000.0
attribute NC_GLOBAL geospatial_vertical_min double 5.0
attribute NC_GLOBAL geospatial_vertical_positive String down
attribute NC_GLOBAL geospatial_vertical_units String m
attribute NC_GLOBAL infoUrl String https://www.bco-dmo.org/dataset/769203 (external link)
attribute NC_GLOBAL institution String BCO-DMO
attribute NC_GLOBAL instruments_0_acronym String Niskin bottle
attribute NC_GLOBAL instruments_0_dataset_instrument_nid String 769221
attribute NC_GLOBAL instruments_0_description String A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24 or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc.
attribute NC_GLOBAL instruments_0_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L22/current/TOOL0412/ (external link)
attribute NC_GLOBAL instruments_0_instrument_name String Niskin bottle
attribute NC_GLOBAL instruments_0_instrument_nid String 413
attribute NC_GLOBAL instruments_0_supplied_name String Niskin bottles
attribute NC_GLOBAL instruments_1_acronym String Gas Chromatograph
attribute NC_GLOBAL instruments_1_dataset_instrument_nid String 769222
attribute NC_GLOBAL instruments_1_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_1_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/LAB02/ (external link)
attribute NC_GLOBAL instruments_1_instrument_name String Gas Chromatograph
attribute NC_GLOBAL instruments_1_instrument_nid String 661
attribute NC_GLOBAL instruments_1_supplied_name String Agilent 7980A
attribute NC_GLOBAL instruments_2_dataset_instrument_nid String 769225
attribute NC_GLOBAL instruments_2_description String The chemiluminescence method for gas analysis of oxides of nitrogen relies on the measurement of light produced by the gas-phase titration of nitric oxide and ozone. A chemiluminescence analyzer can measure the concentration of NO/NO2/NOX.

One example is the Teledyne Model T200: http://www.teledyne-api.com/products/T200.asp
attribute NC_GLOBAL instruments_2_instrument_name String Chemiluminescence NOx Analyzer
attribute NC_GLOBAL instruments_2_instrument_nid String 542895
attribute NC_GLOBAL instruments_2_supplied_name String Antek model 7090
attribute NC_GLOBAL instruments_3_acronym String FID
attribute NC_GLOBAL instruments_3_dataset_instrument_nid String 769223
attribute NC_GLOBAL instruments_3_description String A flame ionization detector (FID) is a scientific instrument that measures the concentration of organic species in a gas stream. It is frequently used as a detector in gas chromatography. Standalone FIDs can also be used in applications such as landfill gas monitoring, fugitive emissions monitoring and internal combustion engine emissions measurement in stationary or portable instruments.
attribute NC_GLOBAL instruments_3_instrument_name String Flame Ionization Detector
attribute NC_GLOBAL instruments_3_instrument_nid String 644600
attribute NC_GLOBAL instruments_3_supplied_name String Agilent 7980A
attribute NC_GLOBAL instruments_4_acronym String Seal Analytical AutoAnalyser 3HR
attribute NC_GLOBAL instruments_4_dataset_instrument_nid String 769224
attribute NC_GLOBAL instruments_4_description String A fully automated Segmented Flow Analysis (SFA) system, ideal for water and seawater analysis. It comprises a modular system which integrates an autosampler, peristaltic pump, chemistry manifold and detector. The sample and reagents are pumped continuously through the chemistry manifold, and air bubbles are introduced at regular intervals forming reaction segments which are mixed using glass coils. The AA3 uses segmented flow analysis principles to reduce inter-sample dispersion, and can analyse up to 100 samples per hour using stable LED light sources.
attribute NC_GLOBAL instruments_4_instrument_name String Seal Analytical AutoAnalyser 3HR
attribute NC_GLOBAL instruments_4_instrument_nid String 765117
attribute NC_GLOBAL instruments_4_supplied_name String SEAL Analytics autoanalyzer model 3 HR
attribute NC_GLOBAL keywords String bco, bco-dmo, biological, C2H4, cast, ch4, chemical, cruise, data, dataset, date, depth, dmo, erddap, iso, latitude, lln, longitude, management, nox, oceanography, office, phosphate, po4, preliminary, srp, station, tdp, time
attribute NC_GLOBAL license String https://www.bco-dmo.org/dataset/769203/license (external link)
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/769203 (external link)
attribute NC_GLOBAL Northernmost_Northing double 40.4025
attribute NC_GLOBAL param_mapping String {'769203': {'Latitude': 'flag - latitude', 'Depth': 'flag - depth', 'Longitude': 'flag - longitude', 'ISO_DateTime_UTC': 'flag - time'}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/769203/parameters (external link)
attribute NC_GLOBAL people_0_affiliation String Woods Hole Oceanographic Institution
attribute NC_GLOBAL people_0_affiliation_acronym String WHOI
attribute NC_GLOBAL people_0_person_name String Daniel J. Repeta
attribute NC_GLOBAL people_0_person_nid String 50621
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 University of Hawaii at Manoa
attribute NC_GLOBAL people_1_affiliation_acronym String SOEST
attribute NC_GLOBAL people_1_person_name String David M. Karl
attribute NC_GLOBAL people_1_person_nid String 50750
attribute NC_GLOBAL people_1_role String Co-Principal Investigator
attribute NC_GLOBAL people_1_role_type String originator
attribute NC_GLOBAL people_2_affiliation String University of Hawaii at Manoa
attribute NC_GLOBAL people_2_affiliation_acronym String SOEST
attribute NC_GLOBAL people_2_person_name String Oscar A. Sosa
attribute NC_GLOBAL people_2_person_nid String 769207
attribute NC_GLOBAL people_2_role String Contact
attribute NC_GLOBAL people_2_role_type String related
attribute NC_GLOBAL people_3_affiliation String Woods Hole Oceanographic Institution
attribute NC_GLOBAL people_3_affiliation_acronym String WHOI BCO-DMO
attribute NC_GLOBAL people_3_person_name String Shannon Rauch
attribute NC_GLOBAL people_3_person_nid String 51498
attribute NC_GLOBAL people_3_role String BCO-DMO Data Manager
attribute NC_GLOBAL people_3_role_type String related
attribute NC_GLOBAL project String PHAT
attribute NC_GLOBAL projects_0_acronym String PHAT
attribute NC_GLOBAL projects_0_description String NSF Award Abstract:
The "marine methane paradox" refers to observations of high concentrations of methane in surface waters of the ocean, even though these waters are well-oxygenated and high in sulfate, both features which generally do not favor the production of methane. This project aims to elucidate on the cause of this paradox. Based on preliminary results, the investigator identified the potential for methane production stimulated by microbial cycling of dissolved organic matter. Polysaccharides (carbonates such as starch) are a major component of high molecular weight dissolved organic matter (HMWDOM) and they can incorporate esters of methylphosphonate, which may be allowing for the production of methane in surface waters. When these HMWDOM polysaccharides were introduced to seawater samples, the researchers saw production of methane with an anomalous stable carbon isotope ratio comparable to what is seen in the paradoxical surface waters enriched in methane. By making measurements of trace gases, HMWDOM phosphonate, and stable carbon isotope measurements in the western North Atlantic Ocean, the investigator and his collaborators will reassess the preliminary data and the implications of these results for the entire oceanographic cycling of methane. Both educational and outreach efforts have been included. For the educational component, a postdoc, a graduate student, and summer undergraduate students will be work on the project, whereas for the outreach activities, the proponent plans to develop curricula on basic science and oceanography for high school students, include a high school teacher in the research cruise, and integrate results into an organic geochemistry course, the lectures of which will be publically available online.
This project seeks to evaluate the possibility that the "marine methane paradox", or the super-saturation of methane in high sulfate, well-oxygenated surface waters, is caused by microbial cycling of dissolved organic matter (DOM). There has been a great deal of preliminary evidence to support this theory. For example, samples from station ALOHA were amended with purified high molecular weight DOM (HMWDOM) polysaccharides, and methane, ethylene, and propylene productions were stimulated. HMWDOM polysaccharides incorporate esters of methylphosphonate (MPn), 2-hydroxyethylphosphonates (2-HEP), and other minor phosphonates, which are likely facilitating the production of methane, ethylene, and propylene. Carbon isotope data supports that this theory is the process behind the marine methane paradox; the d13C value of methane produced from HMWDOM polysaccharide enriched samples agrees well with the anomalous value associated with the super-saturated surface water. Only a small fraction of HMWDOM polysaccharides can easily explain the marine methane paradox, and this process could just as easily fully revise the current understanding of large scale methane cycling between the ocean and atmosphere. The researchers will assess the preliminary evidence and evaluate the microbial DOM cycling theory by making paired trace gas and HMWDOM phosphonate, as well as stable carbon isotope measurements in the western North Atlantic Ocean.
attribute NC_GLOBAL projects_0_end_date String 2019-08
attribute NC_GLOBAL projects_0_geolocation String Sargasso Sea, Western North Atlantic Ocean
attribute NC_GLOBAL projects_0_name String Methane, Ethylene, and Dissolved Organic Phosphorus Cycling in the Western North Atlantic Ocean
attribute NC_GLOBAL projects_0_project_nid String 765014
attribute NC_GLOBAL projects_0_start_date String 2016-09
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 29.05817
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v55
attribute NC_GLOBAL subsetVariables String Cruise
attribute NC_GLOBAL summary String Concentration measurements of water column phosphate, nitrate and nitrite, dissolved organic phosphorus, methane, and ethylene from samples collected during the R/V Niel Armstrong cruise AR16 in the western North Atlantic Ocean in May 2017. Seawater was collected from Niskin bottles deployed on a rosette with a CTD.
attribute NC_GLOBAL time_coverage_end String 2017-05-20T16:41:58Z
attribute NC_GLOBAL time_coverage_start String 2017-05-04T14:35:52Z
attribute NC_GLOBAL title String Concentration measurements of water column phosphate, nitrate and nitrite, dissolved organic phosphorus, methane, and ethylene from samples collected during the R/V Neil Armstrong cruise AR16 in the western North Atlantic Ocean in May 2017
attribute NC_GLOBAL version String 2
attribute NC_GLOBAL Westernmost_Easting double -71.33867
attribute NC_GLOBAL xml_source String osprey2erddap.update_xml() v1.3
variable Cruise   String  
attribute Cruise bcodmo_name String cruise_id
attribute Cruise description String cruise identifier
attribute Cruise long_name String Cruise
attribute Cruise units String unitless
variable Station   byte  
attribute Station _FillValue byte 127
attribute Station actual_range byte 1, 9
attribute Station bcodmo_name String station
attribute Station description String station number
attribute Station long_name String Station
attribute Station units String unitless
variable Cast   byte  
attribute Cast _FillValue byte 127
attribute Cast actual_range byte 3, 87
attribute Cast bcodmo_name String cast
attribute Cast description String cast number
attribute Cast long_name String Cast
attribute Cast units String unitless
variable latitude   double  
attribute latitude _CoordinateAxisType String Lat
attribute latitude _FillValue double NaN
attribute latitude actual_range double 29.05817, 40.4025
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 north (positive values = North)
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 -71.33867, -64.1875
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 east (negative values = West)
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 time   double  
attribute time _CoordinateAxisType String Time
attribute time actual_range double 1.493908552E9, 1.495298518E9
attribute time axis String T
attribute time bcodmo_name String ISO_DateTime_UTC
attribute time description String date and time (UTC) formatted to ISO8601 standard; format: yyyy-mm-ddTHH:MM:SS
attribute time ioos_category String Time
attribute time long_name String ISO Date Time UTC
attribute time nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/ (external link)
attribute time source_name String ISO_DateTime_UTC
attribute time standard_name String time
attribute time time_origin String 01-JAN-1970 00:00:00
attribute time time_precision String 1970-01-01T00:00:00Z
attribute time units String seconds since 1970-01-01T00:00:00Z
variable depth   double  
attribute depth _CoordinateAxisType String Height
attribute depth _CoordinateZisPositive String down
attribute depth _FillValue double NaN
attribute depth actual_range double 5.0, 1000.0
attribute depth axis String Z
attribute depth bcodmo_name String depth
attribute depth colorBarMaximum double 8000.0
attribute depth colorBarMinimum double -8000.0
attribute depth colorBarPalette String TopographyDepth
attribute depth description String sample depth
attribute depth ioos_category String Location
attribute depth long_name String Depth
attribute depth nerc_identifier String https://vocab.nerc.ac.uk/collection/P09/current/DEPH/ (external link)
attribute depth positive String down
attribute depth standard_name String depth
attribute depth units String m
variable CH4   float  
attribute CH4 _FillValue float NaN
attribute CH4 actual_range float 0.59, 4.0
attribute CH4 bcodmo_name String CH4
attribute CH4 description String methane
attribute CH4 long_name String CH4
attribute CH4 units String nanomoles per liter (nmol L-1)
variable C2H4   String  
attribute C2H4 bcodmo_name String unknown
attribute C2H4 description String ethylene
attribute C2H4 long_name String C2 H4
attribute C2H4 units String nanomoles per liter (nmol L-1)
variable NOx   String  
attribute NOx bcodmo_name String NO3_NO2
attribute NOx description String nitrate + nitrite
attribute NOx long_name String NOx
attribute NOx units String micromoles per liter (umol L-1)
variable LLN   float  
attribute LLN _FillValue float NaN
attribute LLN actual_range float 0.002, 0.441
attribute LLN bcodmo_name String Low Level Nitrogen
attribute LLN description String low level nitrogen (nitrate + nitrite)
attribute LLN long_name String LLN
attribute LLN units String micromoles per liter (umol L-1)
variable PO4   String  
attribute PO4 bcodmo_name String PO4
attribute PO4 description String phosphate
attribute PO4 long_name String PO4
attribute PO4 units String micromoles per liter (umol L-1)
variable SRP   float  
attribute SRP _FillValue float NaN
attribute SRP actual_range float 0.001, 0.132
attribute SRP bcodmo_name String Soluble reactive phosphorus
attribute SRP description String soluble reactive phosphorus
attribute SRP long_name String SRP
attribute SRP units String micromoles per liter (umol L-1)
variable TDP   float  
attribute TDP _FillValue float NaN
attribute TDP actual_range float 0.09, 1.66
attribute TDP bcodmo_name String Total Dissolved Phosphorus
attribute TDP description String total dissolved phosphorus
attribute TDP long_name String TDP
attribute TDP units String micromoles per liter (umol L-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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