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Hydrocasts were conducted at identified stations. A SeaBird CTD and rosette system, owned and maintained by Louisiana Universities Marine Consortium (LUMCON), operating institution for the R/V Pelican, was used for sampling. Calibration information can be found associated with the CTD data. Unless otherwise stated, samples used for rate measurements were collected based on the percent irradiance relative to that just below the surface.

Water was sampled from Niskin bottles and pooled into 10 L acid-cleaned carboys. For inorganic nutrients, water was filtered using 0.6 μm pore size polycarbonate membrane and immediately frozen until analysis. Filtered water was analyzed for total dissolved nitrogen (TDN), nitrate+nitrite (NO3 + NO2), nitrite, soluble reactive phosphate (SRP), and ammonium (NH4) colorimetrically using Skalar autoanalyzer (Dzwonkowski et al. 2017), and for dissolved silicic acid (Si(OH)4) using a manual colorimetric method (Krause et al. 2009). Water for Chlorophyll a was filtered through a 0.45 μm-pore 47mm diameter HAWP Millipore filter, immediately frozen, and analyzed on shore (<2 weeks) using an acetone extraction/acidification method (Lomas et al. 2019). For biogenic silica analysis, seawater was filtered through a 1.2 μm-pore polycarbonate filter (47 mm diameter) and frozen immediately. On shore, filters were dried and analyzed using a sodium-carbonate time course digestion, to correct for lithogenic silica interference, in polymethylpentene tubes (Pickering et al. in review). In 2016, NaOH digestions were also done for biogenic silica, followed by an HF digestion to quantify lithogenic silica as in Krause et al. (2009). Diatom abundance was quantified by fixing samples with Bouin's solution; in the laboratory, cells were settled in a chamber and enumerated (Utermöhl 1958).

Diatom rate processes were quantified using a radioisotope (32Si) and fluorescent dye (PDMPO) tracers. Sample bottles were incubated for 12 or 24 hours in acrylic incubators cooled with continually flowing surface water under a series of neutral density screens to simulate light levels at the depth of collection (i.e. see above). Measurement for ambient (Amb) conditions (i.e. no enrichment of Si(OH)4) and enhanced (Enh) conditions (i.e. +20 µM enrichment of Si(OH)4) were made at most stations and depths using 32Si. The gross rate of biogenic silica production was measured using the radioisotope tracer 32Si with high specific activity (>40 kBq µg Si-1) as described in Krause et al. (2011). For PDMPO uptake, dye was added to samples at ambient or enriched Si(OH)4, incubated in the same conditions as the 32Si samples, and processed as in McNair et al. (2015). The net rate of biogenic silica production was calculated from biogenic silica standing stock at the time of sampling and after a 24-hour incubation, under the same conditions as the 32Si and PDMPO, as described in Krause et al. (2010).

1d:Tbea,NSF Award Abstract: The Louisiana Shelf system in the northern Gulf of Mexico is fed by the Mississippi River and its many tributaries which contribute large quantities of nutrients from agricultural fertilizer to the region. Input of these nutrients, especially nitrogen, has led to eutrophication. Eutrophication is the process wherein a body of water such as the Louisiana Shelf becomes enriched in dissolved nutrients that increase phytoplankton growth which eventually leads to decreased oxygen levels in bottom waters. This has certainly been observed in this area, and diatoms, a phytoplankton which represents the base of the food chain, have shown variable silicon/nitrogen (Si/N) ratios. Because diatoms create their shells from silicon, their growth is controlled not only by nitrogen inputs but the availability of silicon. Lower Si/N ratios are showing that silicon may be playing an increasingly important role in regulating diatom production in the system. For this reason, a scientist from the University of South Alabama will determine the biogeochemical processes controlling changes in Si/N ratios in the Louisiana Shelf system. One graduate student on their way to a doctorate degree and three undergraduate students will be supported and trained as part of this project. Also, four scholarships for low-income, high school students from Title 1 schools will get to participate in a month-long summer Marine Science course at the Dauphin Island Sea Laboratory and be included in the research project. The study has significant societal benefits given this is an area where $2.4 trillion gross domestic product revenue is tied up in coastal resources. Since diatoms are at the base of the food chain that is the biotic control on said coastal resources, the growth of diatoms in response to eutrophication is important to study. Eutrophication of the Mississippi River and its tributaries has the potential to alter the biological landscape of the Louisiana Shelf system in the northern Gulf of Mexico by influencing the Si/N ratios below those that are optimal for diatom growth. A scientist from the University of South Alabama believes the observed changes in the Si/N ratio may indicate silicon now plays an important role in regulating diatom production in the system. As such, understanding the biotic and abiotic processes controlling the silicon cycle is crucial because diatoms dominate at the base of the food chain in this highly productive region. The study will focus on following issues: (1) the importance of recycled silicon sources on diatom production; (2) can heavily-silicified diatoms adapt to changing Si/N ratios more effectively than lightly-silicified diatoms; and (3) the role of reverse weathering in sequestering silicon thereby reducing diffusive pore-water transport. To attain these goals, a new analytical approach, the PDMPO method (compound 2-(4-pyridyl)-5-((4-(2-dimethylaminoethylamino-carbamoyl)methoxy)phenyl)oxazole) that quantitatively measures taxa-specific silica production would be used.6:["$","$L1b",null,{"dataset":{"_id":"822048","description":"","problem":"","acquisition":"$1c","processing":"

Data were processed in Microsoft Excel.

BCO-DMO Data Manager Processing Notes:
\n* added a conventional header with dataset name, PI name, version date
\n* modified parameter names to conform with BCO-DMO naming conventions
\n* blank values in this dataset are displayed as \"nd\" for \"no data.\" nd is the default missing data identifier in the BCO-DMO system.
\n* removed all spaces in headers and replaced with underscores
\n* removed all units from headers
\n* converted dates to ISO Format yyyy-mm-dd
\n* merged Date_Zulu and Time_Zulu to create ISO_DateTime_UTC and then removed Zulu columns
\n* set Types for each data column
\n* merged the CLASiC 2016 and 2017 Water Column data files into one dataset
\n* replaced - and , in Rosette_Bottle column with ;

\n","bcodmoProcessing":"","title":"Water column data sampled aboard the R/V Pelican during August and September 2016 and May 2017 in Northern Gulf of Mexico, specifically the Louisiana Shelf region dominated by the discharge of the Mississippi River plume.","nickname":"CLASiC Water Column","dataUrl":"","currentState":"Final no updates expected","currentStateId":"7","validated":true,"restricted":false,"version":"1","version_date":"2020-09-01T04:00:00.000Z","abstract":"Water column data sampled aboard the R/V Pelican during August and September 2016 and May 2017 in Northern Gulf of Mexico, specifically the Louisiana Shelf region dominated by the discharge of the Mississippi River plume.","citation":"Krause, J., Acton, S., Marquez Jr., I., Pickering, R., Maiti, K. (2020) Water column data sampled aboard the R/V Pelican during August and September 2016 and May 2017 in Northern Gulf of Mexico, specifically the Louisiana Shelf region dominated by the discharge of the Mississippi River plume. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2020-09-01 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.822048.1 [access date]","citationParts":{"identifier":"doi:10.26008/1912/bco-dmo.822048.1","versionDate":"2020-09-01","versionId":"1","year":"2020","title":"Water column data sampled aboard the R/V Pelican during August and September 2016 and May 2017 in Northern Gulf of Mexico, specifically the Louisiana Shelf region dominated by the discharge of the Mississippi River plume.","authors":"Krause, J., Acton, S., Marquez Jr., I., Pickering, R., Maiti, K.","publisher":"Biological and Chemical Oceanography Data Management Office (BCO-DMO)."},"doi":"10.26008/1912/bco-dmo.822048.1","release_date":null,"field_dataset_location":"","temporal_extent":{"start":"2016-08-28T04:00:00.000Z","end":"2017-05-12T04:00:00.000Z"},"temporal":{"resolution":"time:unitDay","type":"time:Interval","start":{"value":"1472356800","label":"2016-08-28"},"end":{"value":"1494561600","label":"2017-05-12"}},"spatial_extent":{"shape":"polygon","center":{"latitude":28.667185000002,"longitude":-90.531585000005},"wkt":"POLYGON ((-91.6109 28.2633, -89.45227 28.2633, -89.45227 29.07107, -91.6109 29.07107, -91.6109 28.2633))","north":29.07107,"east":-89.45227,"south":28.2633,"west":-91.6109},"dataset_type":["Cruise Results"],"keywords":["oceans"],"data_files":[{"id":"903058","title":"water_col_cat.csv","url":"https://datadocs.bco-dmo.org/dataset/822048/file/rggprXGCArO66J/water_col_cat.csv","showTableUrl":"https://www.bco-dmo.org/dataset/822048/data/view/903058","description":"Primary data file for dataset ID 822048","filename":"water_col_cat.csv","bytesize":35220,"checksum":{"value":"11b88fa79c320e559dc51d1993c66b44","Algorithm":{"_id":"190","name":"MD5"}},"mimetype":"text/csv","fileType":{"_id":"192","name":"Comma Separated Values (.csv)"},"isErddap":"","date":"","isPublicDuringEmbargo":false,"primaryDataFile":true,"showTable":true,"restricted":false}],"supplemental_files":[],"roles":[{"role":{"_id":"138","name":"Principal Investigator"},"performedBy":{"_id":"544582","name":"Jeffrey W. Krause"},"performedAtOrganization":{"_id":"242","name":"Dauphin Island Sea Lab"}},{"role":{"_id":"140","name":"Co-Principal Investigator"},"performedBy":{"_id":"712671","name":"Kanchan Maiti"},"performedAtOrganization":{"_id":"202","name":"Louisiana State University Dept. of Oceanography and Coastal Science"}},{"role":{"_id":"128","name":"Student"},"performedBy":{"_id":"808389","name":"Israel A. Marquez Jr."},"performedAtOrganization":{"_id":"242","name":"Dauphin Island Sea Lab"}},{"role":{"_id":"128","name":"Student"},"performedBy":{"_id":"786518","name":"Rebecca A. Pickering"},"performedAtOrganization":{"_id":"242","name":"Dauphin Island Sea Lab"}},{"role":{"_id":"135","name":"Technician"},"performedBy":{"_id":"822285","name":"Sydney Acton"},"performedAtOrganization":{"_id":"242","name":"Dauphin Island Sea Lab"}},{"role":{"_id":"145","name":"BCO-DMO Data Manager"},"performedBy":{"_id":"746212","name":"Christina Haskins"},"performedAtOrganization":{"_id":"191","name":"Woods Hole Oceanographic Institution"}}],"deployments":[{"_id":"822209","name":"PE17-04","synonyms":["CLASiC_2016"],"dates":{"start":"2016-08-26T00:00:00.000Z","end":"2016-09-06T00:00:00.000Z"},"platform":{"_id":"54114","name":"R/V Pelican"},"chiefScientists":[{"id":"544582","name":"Jeffrey W. Krause","role":"Chief Scientist"}]},{"_id":"792830","name":"PE17-20","synonyms":["CLASiC_2017"],"dates":{"start":"2017-05-03T00:00:00.000Z","end":"2017-05-13T00:00:00.000Z"},"platform":{"_id":"54114","name":"R/V Pelican"},"chiefScientists":[{"id":"544582","name":"Jeffrey W. Krause","role":"Chief Scientist"}]}],"funding":[{"_id":"712666","name":"OCE-1558957","fundingSource":{"_id":"355","name":"NSF Division of Ocean Sciences"},"url":"https://www.nsf.gov/awardsearch/show-award?AWD_ID=1558957"}],"instruments":[{"_id":"822053","name":"Trilogy fluorometer (Turner Designs)","description":"Quantification of Chlorophyll a and bulk PDMPO were done using a Trilogy fluorometer (Turner Designs). For Chlorophyll a, an acidification-method (acetone and HCl matrix) module was used; for PDMPO, a crude-oil module was used with a sample matrix of hydrofluoric acid and boric acid. Chlorophyll a was calibrated using a certified standard, PDMPO was calibrated using a sequential addition of stock dye purchased from the vendor. ","type_id":"484","type_name":"Fluorometer","type_desc":"A fluorometer or fluorimeter is a device used to measure parameters of fluorescence: its intensity and wavelength distribution of emission spectrum after excitation by a certain spectrum of light. The instrument is designed to measure the amount of stimulated electromagnetic radiation produced by pulses of electromagnetic radiation emitted into a water sample or in situ.","type_acronym":"Fluorometer"},{"_id":"822052","name":"GM 25 Multicounters (Risø National Laboratory, Technical University of Denmark)","description":"Quantification of 32Si activity was done on a GM 25 Multicounters (Risø National Laboratory, Technical University of Denmark), each are configured to analyze five samples simultaneously. System setup includes an anti-coincidence module, which with considerable lead shielding reduces background activity to","type_id":"672191","type_name":"GM multicounter","type_desc":"A gas flow multicounter (GM multicounter) is used for counting low-level beta doses. GM multicounters can be used for gas proportional counting of 32Si to 32P. For more information about GM multicounter usage see Krause et. al. 2011.","type_acronym":""},{"_id":"822051","name":"Skalar autoanalyzer","description":"Nutrients were analyzed colorimetrically using Skalar autoanalyzer, except for dissolved silicic acid (Si(OH)4) using a manual colorimetric method on a Genesys 10S UV-Vis spectrophotometer. Similarly, biogenic silica was digested in an alkaline solution (to solubilize particles) and analyzed as Si(OH)4 spectrophotometrically.","type_id":"558","type_name":"Nutrient Autoanalyzer","type_desc":"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.","type_acronym":"Nutrient Autoanalyzer"}],"parameters":[{"_id":"822928","name":"Cruise","format":"","frictionlessType":"","description":"

Name of specific cruise, no units

","units":{"_id":"","name":"unitless"},"type":{"_id":"1929","name":"Cruise Name","description":"

The cruise_name is a local name chosen by project investigators for a research expedition on a vessel, as opposed to the formal/official cruise ID asserted by the vessel operator.

"}},{"_id":"822929","name":"Cast_Number","format":"","frictionlessType":"","description":"

CTD Number (chronological)

","units":{"_id":"","name":"unitless"},"type":{"_id":"761","name":"cast","description":"

cast or profile number

"}},{"_id":"822930","name":"Latitude","format":"","frictionlessType":"","description":"

Latitude of hydrocast

","units":{"_id":"","name":"decimal degrees"},"type":{"_id":"730","name":"latitude","description":"

latitude, in decimal degrees, North is positive, negative denotes South; Reported in some datasets as degrees, minutes

"}},{"_id":"822931","name":"Longitude","format":"","frictionlessType":"","description":"

Longitude of hydrocast

","units":{"_id":"","name":"decimal degrees"},"type":{"_id":"731","name":"longitude","description":"

longitude, in decimal degrees, East is positive, negative denotes West; Reported in some datsets as degrees, minutes

"}},{"_id":"822932","name":"ISO_DateTime_UTC","format":"","frictionlessType":"","description":"

Date/Time (UTC) ISO formatted

","units":{"_id":"","name":"YYYY-MM-DDTHH:MM:SS[.xx]Z"},"type":{"_id":"1908","name":"ISO_DateTime_UTC","description":"

Date/Time (UTC) ISO formatted
\nThis standard is based on ISO 8601:2004(E) and takes on any of the following forms:
\n2009-08-30T09:05:00[.xx] (local time)
\n2009-08-30T14:05:00[.xx]Z (UTC time)
\n2009-08-30T14:05:00[.xx]-05:00
\nThe dashes and the colons can be dropped.
\nThe T can also be dropped \"by mutual agreement\", but one needs the trailing Z if the time is UTC.

Sample ISO_datetime_utc:
\n2009-08-30T14:05:00[.xx]Z (UTC time)

Format: YYYY-mm-ddTHH:MM:SS[.xx]Z (UTC time)

"}},{"_id":"822933","name":"Date_Local","format":"","frictionlessType":"","description":"

Local date of hydrocast

","units":{"_id":"","name":"YYYY-MM-DD"},"type":{"_id":"799","name":"date_local","description":"

local month, day and year, usually as a text string, e.g. feb10_1995. It is better to use one of the other forms of presenting date and time data so that the data can be used in computations and for comparisons. Note, if the string begins with numbers but also includes letters, there may be problems using the field name for retrieval.

"}},{"_id":"822934","name":"Time_Local","format":"","frictionlessType":"","description":"

Local time of hydrocast

","units":{"_id":"","name":"HH:MM"},"type":{"_id":"1007","name":"time_local","description":"

time of day, local time, using 2400 clock format

"}},{"_id":"822935","name":"Station_Number","format":"","frictionlessType":"","description":"

specific to cruise

","units":{"_id":"","name":"unitless"},"type":{"_id":"987","name":"station","description":"

Station identifier; a unique number or alphanumeric string designating a general geographic location at which one or more sampling activities may occur.

"}},{"_id":"822936","name":"Bottom_Depth","format":"","frictionlessType":"","description":"

depth of water

","units":{"_id":"","name":"meter (m)"},"type":{"_id":"1695","name":"depth_bottom","description":"

bottom depth

"}},{"_id":"822937","name":"Actual_Depth","format":"","frictionlessType":"","description":"

Niskin bottle sample depth

","units":{"_id":"","name":"meter (m)"},"type":{"_id":"808","name":"depth","description":"

Observation/sample depth below the sea surface. Units often reported as: meters, feet.

\nWhen used in a JGOFS/GLOBEC dataset the depth is a best estimate; usually but not always calculated from pressure; calculated either from CTD pressure using Fofonoff and Millard (1982; UNESCO Tech Paper #44) algorithm adjusted for 1980 equation of state for seawater (EOS80) or simply equivalent to nominal depth as recorded during sampling if CTD pressure was unavailable.

"}},{"_id":"822938","name":"Rosette_Bottle","format":"","frictionlessType":"","description":"

Niskin Bottle number(s) for specific depth

","units":{"_id":"","name":"unitless"},"type":{"_id":"1854","name":"bot_Nis","description":"

Niskin sample bottle number

"}},{"_id":"822939","name":"Target_pct_lo","format":"","frictionlessType":"","description":"

Percent irradiance, relative to just below surface (Io), at sample depth

","units":{"_id":"","name":"% lo"},"type":{"_id":"1073","name":"no_bcodmo_term","description":"

An association with a community-wide standard parameter has not yet been made.

"}},{"_id":"822940","name":"Phosphate","format":"","frictionlessType":"","description":"

soluble reactive phosphorus

","units":{"_id":"","name":"umol/L"},"type":{"_id":"937","name":"PO4","description":"

Orthophosphate (phosphate, reactive phosphorus), Various units.

"}},{"_id":"822941","name":"Nitrate_Nitrite","format":"","frictionlessType":"","description":"

dissolved nitrate plus nitrite

","units":{"_id":"","name":"umol/L"},"type":{"_id":"902","name":"NO3_NO2","description":"

Nitrate and Nitrite, µM (micromolar) or µg-at NO3-N and NO2-N/l

"}},{"_id":"822942","name":"Nitrite","format":"","frictionlessType":"","description":"

dissolved nitrite

","units":{"_id":"","name":"umol/L"},"type":{"_id":"1192","name":"NO2","description":"

Nitrite

"}},{"_id":"822943","name":"Ammonium","format":"","frictionlessType":"","description":"

dissolved ammonium

","units":{"_id":"","name":"umol/L"},"type":{"_id":"901","name":"Ammonium","description":"

Ammonium and ammonia concentration parameters in any body of fresh or salt water.

"}},{"_id":"822944","name":"TDN","format":"","frictionlessType":"","description":"

total dissolved nitrogen

","units":{"_id":"","name":"umol/L"},"type":{"_id":"1911","name":"Total Dissolved Nitrogen","description":"

The concentration of nitrogen (N) remaining in a seawater sample after all particulate nitrogen has been removed by filtration. See dataset for units (may be micromoles/kilogram or micromolar).

"}},{"_id":"822945","name":"Silicate","format":"","frictionlessType":"","description":"

dissolved silicate

","units":{"_id":"","name":"umol/L"},"type":{"_id":"1209","name":"SiO4","description":"

Silicate; reactive silica. Also referred to as dissolved silicate, dissolved silica.

"}},{"_id":"822946","name":"Pheophytin","format":"","frictionlessType":"","description":"

degraded phaeopigments

","units":{"_id":"","name":"ug/L"},"type":{"_id":"925","name":"phaeopigment","description":"

total phaeopigment, in milligrams per meter cubed (mg/m^3) or micrograms per liter (µg/l); units vary with dataset; for US JGOFS phaeopigments are measured by fluorometric method and reported in micrograms/liter

"}},{"_id":"822947","name":"Chlorophyll_a","format":"","frictionlessType":"","description":"

chlorophyll a pigment

","units":{"_id":"","name":"ug/L"},"type":{"_id":"766","name":"chlorophyll a","description":"

Total chlorophyll a pigment. See dataset for units of measurement; often reported in: milligrams per cubic meter (mg/m3); micrograms/liter (ug/L); nanograms/liter (ng/L).

CAUTION Within JGOFS MERGED water column products: this parameter is derived from HPLC methodology and the units are nanograms/liter; however; this parameter name is also used for a variety of water and nonwater column sampling; derived via the fluorometric method; units will also vary.

"}},{"_id":"822948","name":"bSi","format":"","frictionlessType":"","description":"

particulate biogenic silica

","units":{"_id":"","name":"umol Si/L"},"type":{"_id":"1208","name":"Si_bio","description":"

Concentration or other measure of biogenic silica. Biogenic silica (bSi), also referred to as opal, is a biogenic mineral comprised of hydrated silica. \"Biogenic silica\" refers to the nanostructural form of silica found in living organisms, such as diatoms and sponges, which is characterized by spherical structures and a highly porous nature.

"}},{"_id":"822949","name":"LSi","format":"","frictionlessType":"","description":"

particulate lithogenic silica

","units":{"_id":"","name":"umol Si/L"},"type":{"_id":"1073","name":"no_bcodmo_term","description":"

An association with a community-wide standard parameter has not yet been made.

"}},{"_id":"822950","name":"Total_Diatom_Abundance","format":"","frictionlessType":"","description":"

diatom abundance

","units":{"_id":"","name":"cells/L"},"type":{"_id":"1536","name":"diatom","description":"

diatom abundance

"}},{"_id":"822951","name":"Rho_Net","format":"","frictionlessType":"","description":"

Average rate of net biogenic silica production

","units":{"_id":"","name":"umol Si/L/d"},"type":{"_id":"1622","name":"Si_rho","description":"

rate of biogenic silica production

"}},{"_id":"822952","name":"Rho_Net_Stdev","format":"","frictionlessType":"","description":"

Standard deviation for rate of net biogenic silica production

","units":{"_id":"","name":"umol Si/L/d"},"type":{"_id":"1974","name":"standard deviation","description":"

Generic standard deviation value, taking on the units of the parameter that it is tied to.

"}},{"_id":"822953","name":"Uptake_32Si_rho_Amb","format":"","frictionlessType":"","description":"

32Si-based Gross biogenic silica production at ambient silicate

","units":{"_id":"","name":"umol Si/L/d"},"type":{"_id":"1622","name":"Si_rho","description":"

rate of biogenic silica production

"}},{"_id":"822954","name":"Uptake_32Si_Vb_Amb","format":"","frictionlessType":"","description":"

32Si-based Biomass-normalized biogenic silica production at ambient silicate

","units":{"_id":"","name":"d-1"},"type":{"_id":"1623","name":"Si_Vb","description":"

specific rate of biogenic silica production

"}},{"_id":"822955","name":"Uptake_32Si_rho_Enh","format":"","frictionlessType":"","description":"

32Si-based Gross biogenic silica production at +20uM silicate above ambient

","units":{"_id":"","name":"umol Si/L/d"},"type":{"_id":"1622","name":"Si_rho","description":"

rate of biogenic silica production

"}},{"_id":"822956","name":"Uptake_32Si_Vb_Enh","format":"","frictionlessType":"","description":"

32Si-based Biomass-normalized biogenic silica production at +20uM silicate above ambient

","units":{"_id":"","name":"d-1"},"type":{"_id":"1623","name":"Si_Vb","description":"

specific rate of biogenic silica production

"}},{"_id":"822957","name":"PDMPO_Uptake_rho_Amb","format":"","frictionlessType":"","description":"

PDMPO-based Gross biogenic silica production proxy at ambient silicate

","units":{"_id":"","name":"nmol PDMPO/L/d"},"type":{"_id":"1622","name":"Si_rho","description":"

rate of biogenic silica production

"}},{"_id":"822958","name":"PDMPO_Uptake_Blank_Amb","format":"","frictionlessType":"","description":"

PDMPO-blank value at ambient silicate

","units":{"_id":"","name":"RFU"},"type":{"_id":"514903","name":"instrument blank","description":"

This is the starting value for a measurement from an instrument. Another term for it is 'instrument zero'. It is part of the experimental procedure before measuring something as an indication of the error associated with the instrument or the standard concentration solution.

"}},{"_id":"822959","name":"PDMPO_Uptake_rho_Enh","format":"","frictionlessType":"","description":"

PDMPO-based Gross biogenic silica production proxy at +20uM silicate above ambient

","units":{"_id":"","name":"nmol PDMPO/L/d"},"type":{"_id":"1622","name":"Si_rho","description":"

rate of biogenic silica production

"}},{"_id":"822960","name":"PDMPO_Uptake_Blank_Enh","format":"","frictionlessType":"","description":"

PDMPO-blank value at +20uM silicate above ambient

","units":{"_id":"","name":"RFU"},"type":{"_id":"514903","name":"instrument blank","description":"

"}},{"_id":"822961","name":"Temperature","format":"","frictionlessType":"","description":"

CTD Temperature

","units":{"_id":"","name":"degrees Celsius"},"type":{"_id":"733","name":"temperature","description":"

water temperature at measurement depth

"}},{"_id":"822962","name":"Salinity","format":"","frictionlessType":"","description":"

CTD Salinity, Practical

","units":{"_id":"","name":"PSU"},"type":{"_id":"955","name":"sal","description":"

Salinity: The amount (mass or quantity of matter) of salt per amount (volume or mass) of a body of water.

"}},{"_id":"822963","name":"Oxygen","format":"","frictionlessType":"","description":"

CTD Oxygen sensor

","units":{"_id":"","name":"mg/l"},"type":{"_id":"910","name":"dissolved Oxygen","description":"

dissolved oxygen concentration

"}},{"_id":"822964","name":"Beam_Transmission","format":"","frictionlessType":"","description":"

Beam Transmission on WET Labs C-Star

","units":{"_id":"","name":"percent (%)"},"type":{"_id":"1013","name":"transmission","description":"

light transmission, as percent

"}},{"_id":"822965","name":"Beam_Attenuation","format":"","frictionlessType":"","description":"

Beam Attenuation on WET Labs C-Star

","units":{"_id":"","name":"1/m"},"type":{"_id":"1147","name":"beam_cp","description":"

attenuation (loss of light) of a narrow, well collimated beam of light; beam attenuation due to particles; the particulate beam attenuation coefficient (cp)

"}},{"_id":"822966","name":"Fluorescence_Chl","format":"","frictionlessType":"","description":"

Chlorophyll Fluorescence

","units":{"_id":"","name":"ug/l"},"type":{"_id":"835","name":"fluorescence","description":"

Fluorescence. Indirect measure of pigment concentration.

Units and collection method may vary. Units often reported in milligrams/meter^3 (mg/m3) or micromoles per liter (ug/L). Sometimes reported after being calibrated against extracted pigment concentrations.

In JGOFS/GLOBEC projects fluorescence is measured from CTD instrument sensor.

"}},{"_id":"822967","name":"PAR_Irradiance","format":"","frictionlessType":"","description":"

Photosynthetically Active Radiation/Irradiance

","units":{"_id":"","name":"uE/m2/s"},"type":{"_id":"913","name":"PAR","description":"

Photosynthetically Available [Active] Radiation; downwelling irradiance; units vary: off microEinsteins/meter^2/second, microEinsteins/centimeter^2/second, or micromoles photons/meter/second

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