Discrete water column sample data from predefined locations (stations) of the West Florida Shelf collected in July and August, 2013

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Frequently anticipated questions:

What does this data set describe?

Title:
Discrete water column sample data from predefined locations (stations) of the West Florida Shelf collected in July and August, 2013
Abstract:
The United States Geological Survey (USGS) is studying the effects of climate change on ocean acidification within the Gulf of Mexico; dealing specifically with the effect of ocean acidification on marine organisms and habitats. To investigate this, the USGS participated in cruises on the West Florida Shelf and northern Gulf of Mexico regions aboard the research vessel (R/V) Weatherbird II or Bellows, ships of opportunity led by Dr. Kendra Daly, of the University of South Florida (USF) in July and August, 2013. Cruises left from and returned to Saint Petersburg, Florida, but followed different routes. The USGS collected geochemical data pertaining to pH, dissolved inorganic carbon (DIC), total carbon dioxide (TCO2), and total alkalinity (TA) in discrete samples at various depths from predetermined stations. Discrete surface samples were also taken, while in transit, during both cruises.
Supplemental_Information:
The USGS Saint Petersburg Coastal and Marine Science Center (SPCMSC) - St. Petersburg, FL, assigns a unique identifier to each cruise or field activity. For example, 13BHM01 indicates the data were collected in 2013 for Benthic Habitat Mapping and the data were collected during the first field activity for that project in that calendar year.
  1. How might this data set be cited?
    Robbins, Lisa L., Barrera, Kira E., Daly, Kendra L., and Knorr, Paul O., 20190416, Discrete water column sample data from predefined locations (stations) of the West Florida Shelf collected in July and August, 2013: U.S. Geological Survey Data Release doi:10.5066/F7RB72R7, U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center, St. Petersburg, FL, USA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -88.40584
    East_Bounding_Coordinate: -83.01826
    North_Bounding_Coordinate: 30.05589
    South_Bounding_Coordinate: 27.04848
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 08-Jul-2013
    Ending_Date: 11-Aug-2013
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: tabular digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.019793873. Longitudes are given to the nearest 0.0224041157. Latitude and longitude values are specified in Decimal Degrees. The horizontal datum used is D WGS 1984.
      The ellipsoid used is WGS 1984.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257223563.
  7. How does the data set describe geographic features?
    2013_July_Samples_Station.csv, 2013_August_Samples_Station.csv
    Chemical and physical measurements of the water column at specific depths and locations (Source: USGS)
    Cruise_ID
    Cruise name according to the USGS Field Activity Number (Source: USGS) 13BHM01, 13BHM02
    Sample_ID
    Sample identification number (Source: USGS) Sample IDs are based on the station identifier (for example, PCB, BE, NT, ST or DSH), and followed by numbers in sequential order. "dup", if present, indicates a duplicate sample collected at the station for quality control purposes.
    Date_Time_UTC
    Date and time of sample collection in M/DD/YYYY HH:MM format, Coordinated Universal Time (UTC) (Source: USGS) Date of sample collection in M/DD/YYYY format Time of data collection in HH:MM UTC
    Date_Time_EST
    Date and time of sample collection in M/DD/YYYY HH:MM format, Eastern Standard Time (EST) (Source: USGS) Date of sample collection in M/DD/YYYY format Time of data collection in HH:MM EST
    Date
    Date of sample collection (Source: USGS) Date of sample collection in M/DD/YYYY format
    Time_EST
    Time in Eastern Standard Time zone (Source: USGS) Time of data collection in HH:MM EST
    Latitude
    Latitude in geographic coordinate system (World Geodetic System of 1984) decimal degrees (Source: USGS)
    Range of values
    Minimum:27.04848
    Maximum:30.05589
    Units:decimal degrees
    Longitude
    Longitude in geographic coordinate system (World Geodetic System of 1984) decimal degrees (Source: USGS)
    Range of values
    Minimum:-88.4058
    Maximum:-83.0182
    Units:decimal degrees
    Depth_m
    Depth from which the sample was collected (Source: USGS)
    Range of values
    Minimum:0
    Maximum:2273.935
    Units:meters
    Salinity ppt
    Salinity in parts per thousand (Source: USGS)
    Range of values
    Minimum:31.45
    Maximum:36.88
    Units:parts per thousand
    TCO2 (µmol/kgSW)
    Total Carbon Dioxide (Source: USGS)
    Range of values
    Minimum:1900.42
    Maximum:2217.16
    Units:micromol per kilogram of seawater
    TCO2 (µmol/kgSW)_Flag
    World Ocean Circulation Experiment (WOCE) Quality Control Data Flagging Convention (https://www.nodc.noaa.gov/woce/woce_v3/wocedata_1/whp/exchange/exchange_format_desc.htm) (Source: USGS)
    ValueDefinition
    2Good
    3Questionable
    4Bad
    6Average of replicates
    9Not collected
    TA (µmol/kgSW)
    Total Alkalinity (Source: USGS)
    Range of values
    Minimum:2208.52
    Maximum:2423.20
    Units:micromol per kilogram of seawater
    TA (µmol/kgSW)_Flag
    World Ocean Circulation Experiment (WOCE) Quality Control Data Flagging Convention (https://www.nodc.noaa.gov/woce/woce_v3/wocedata_1/whp/exchange/exchange_format_desc.htm) (Source: USGS)
    ValueDefinition
    2Good
    3Questionable
    4Bad
    6Average of replicates
    9Not collected
    Entity_and_Attribute_Overview:
    The entity and attribute information provided here describes the tabular datasets. Please review the detailed descriptions that are provided (the individual attribute descriptions) for information on the values that appear as fields/table entries of the dataset.
    Entity_and_Attribute_Detail_Citation:
    The entity and attribute information was generated by the individual and/or agency identified as the originator of the dataset. Please review the rest of the metadata record for additional details and information.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Lisa L. Robbins
    • Kira E. Barrera
    • Kendra L. Daly
    • Paul O. Knorr
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    USGS St. Petersburg Coastal and Marine Science Center
    600 4th Street South
    St. Petersburg, Florida
    US

    727-502-8000 (voice)
    727-502-8181 (FAX)
    Hours_of_Service: 8AM to 5PM M-F EST

Why was the data set created?

Discrete water samples were collected underway and at stations. Water samples were analyzed at the USGS geochemistry laboratory in St. Petersburg, Florida. Data were collected during USGS field activity number (FAN) 13BHM01 and 13BHM02; additional survey details are available at http://cmgds.marine.usgs.gov/. This data release contains data for two benthic habitat cruises conducted in 2013: 13BHM01, July 8-12 (R/V Bellows) and 13BHM02, August 5-11 (R/V Weatherbird II).

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 2013 (process 1 of 3)
    During each cruise, a 12-bottle rosette with YSI 6600 conductivity-temperature-depth (CTD) sonde was deployed to various depths, at predetermined, specific sample locations (stations). On the downcast, a profile for the water column was recorded and the information was used to determine sample locations on the upcast. Samples were generally taken at the bottom, middle, and top of the station. Occasionally samples were taken at the chlorophyll maximum, as well as depths above and below. Samples were transported to the USGS Carbon Chemistry Laboratory in St. Petersburg, Florida or Dr. Robert Byrne's Laboratory at USF. Total alkalinity samples were analyzed with a custom automatic titration system consisting of either a USB-4000 or USB-2000 fiber optic spectrometer (Ocean Optics, Inc. USA), a 665 Dosimat auto-titrator with stir plate, and a purging system with high-purity N2 gas following the methods of Yao and Byrne (1998). Total carbon was analyzed using a CM5014 CO2 coulometer (UIC, Inc., USA) with Model CM5130 Acidification Modules following the coulometric methods of Dickson and others (2007). Precision for these methods was better than ± 2 micromole per kilogram (mol/kg) for TA and TCO2.
    Date: 2013 (process 2 of 3)
    Discrete station sample data from both surveys were entered into a spreadsheet and merged with other data sources including: GPS from the ship, salinity and temperature from the CTD, as well as the lab results of total alkalinity and disolved inorganic carbon from the USGS St. Petersburg Carbon Analytical Laboratory. Processed files were saved in Comma Seperated Values (.csv) and Microsoft Excel Workbook (.xlsx) formats. Data sources produced in this process:
    • 2013_July_Samples_Station.csv
    • 2013_July_Samples_Station.xlsx
    • 2013_August_Samples_Station.csv
    • 2013_August_Samples_Station.xlsx
    Date: 13-Oct-2020 (process 3 of 3)
    Added keywords section with USGS persistent identifier as theme keyword. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
  3. What similar or related data should the user be aware of?
    Yao, W., and Byrne, R., 19980801, Simplified seawater alkalinity analysis: Use of linear array spectrometers: Deep Sea Research Part 1: Oceanographic Research Papers, Philadelphia, PA.

    Online Links:

    Other_Citation_Details: 45.8, 1383-1392
    Dickson, A. G., Sabine, C. L., and Christian, J. R. (eds.), 2007, Guide to best practices for ocean CO2 measurements. PICES special publication 3, 191 pp.: North Pacific Marine Science Organization, Sidney, BC, Canada.

    Online Links:

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    This dataset is considered complete for the information presented, as described in the abstract section. Users are advised to read the rest of the metadata record carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    These datasets are from field activities with consistent instrument calibrations.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None
Use_Constraints:
The USGS and USF request to be acknowledged as originators of the data in future products or derivative research.
  1. Who distributes the data set? (Distributor 1 of 1)
    USGS St. Petersburg Coastal and Marine Science Center
    600 4th Street South
    St. Petersburg, Florida
    US

    727-502-8000 (voice)
  2. What's the catalog number I need to order this data set?
  3. What legal disclaimers am I supposed to read?
    This digital publication was prepared by an agency of the United States Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 09-Nov-2021
Metadata author:
United States Geological Survey, St. Petersburg Coastal and Marine Science Center
Attn: SPCMSC Data Management Group
600 4th Street South
St. Petersburg, Florida
US

727-502-8000 (voice)
gs-g-spcmsc_data_inquiries@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/2013_Samples_Station.faq.html>
Generated by mp version 2.9.50 on Tue Nov 9 16:47:42 2021