Autonomous Flow-Thru (AFT) CO2 data of the West Florida Shelf: USGS Cruise 11BHM02

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Frequently anticipated questions:


What does this data set describe?

Title:
Autonomous Flow-Thru (AFT) CO2 data of the West Florida Shelf: USGS Cruise 11BHM02
Abstract:
The United States Geological Survey (USGS) is conducting a study on 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 in the West Florida Shelf and northern Gulf of Mexico regions aboard the R/V Weatherbird II, a ship of opportunity lead by Dr. Kendra Daly, of the University of South Florida (USF). This cruise occurred June 25 - 30, 2011, leaving from and returned to Saint Petersburg, Florida. The USGS collected data pertaining to pH, dissolved inorganic carbon (DIC), and total alkalinity in discrete samples over a span of 1632 kilometer (km) track line, additionally 36 discrete samples were taken at ten stations, these were taken at various depths. Flow-through conductivity-temperature-depth (CTD) data were collected, which includes temperature, salinity, and pH. Corroborating the USGS data are the vertical CTD profiles collected by USF, using the following sensors: CTD, oxygen, chlorophyll fluorescence, optical backscatter, and transmissometer. Additionally, discrete depth samples for nutrients, chlorophyll, and particulate organic carbon/nitrogen were collected.
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, 11BHM02 tells us the data were collected in 2011 for Benthic Habitat Mapping and the data were collected during the second field activity for that project in that calendar year. Refer to http://walrus.wr.usgs.gov/infobank/programs/html/definition/activity.html for a detailed description of the method used to assign the cruise ID.
  1. How might this data set be cited?
    Robbins, Lisa L., Barrera, Kira E., Daly, Kendra L., and Knorr, Paul O., 2013, Autonomous Flow-Thru (AFT) CO2 data of the West Florida Shelf: USGS Cruise 11BHM02: Data Series 712, U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center, St. Petersburg, FL.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -85.8753
    East_Bounding_Coordinate: -83.03413
    North_Bounding_Coordinate: 29.20133
    South_Bounding_Coordinate: 27.06688
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2011
    Currentness_Reference:
    data collection
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: vector digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • Entity point (39)
    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 8.9831528411952133e-009. Longitudes are given to the nearest 8.9831528411952133e-009. 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?
    2011_June_Aft_CO2
    Autonomous Flow Through (AFT) system continuous measurements of chemical and physical parameters of seawater (Source: USGS)
    FID
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry. (Source: ESRI) Coordinates defining the features.
    Cruise_ID
    Cruise name according to the USGS Field Activity Collection (Source: USGS) Coordinates defining the features.
    Date_UTC
    Date in UTC time zone; MM/DD/YYYY (Source: USGS) Date of sample collection in MM/DD/YYYY format
    Time_UTC
    Time of data collection in HH:MM UTC, 24 hour format (Source: USGS) Time of data collection in HH:MM UTC
    Date_EDT
    Date in EDT time zone; MM/DD/YYYY (Source: USGS) Date of sample collection in MM/DD/YYYY format
    Time_EDT
    Time of data collection in HH:MM EDT, 24 hour format (Source: USGS) Time of data collection in HH:MM EDT
    Latitude
    Latitude in decimal degrees (Source: WGS 1984)
    Range of values
    Minimum:27.06688
    Maximum:29.20133
    Longitude
    Longitude in decimal degrees (Source: WGS 1984)
    Range of values
    Minimum:-85.8753
    Maximum:-83.03413
    CO2
    a measure of CO2 of a solution (Source: USGS)
    Range of values
    Minimum:274.5
    Maximum:467.5
    Temp_C
    water temperature (Source: USGS)
    Range of values
    Minimum:28.59
    Maximum:30.84
    Ship_Sal_P
    measurement of salt within a body of water (PSU) (Source: USGS)
    Range of values
    Minimum:15.94
    Maximum:36.66
    Entity_and_Attribute_Overview:
    All attributes are common between the three data formats provided (.csv, .xls, .shp), except for the attributes FID and SHAPE (indicated by *), which are found only within the shapefile (.shp) because they are unique to that data type. Additionally, the GPS data was taken from the Weatherbird II's navigation logs and was matched with the time logs on the sonde. These data have not been QA/QC yet, and as such could have data errors due to tubes clogging, or flowthrough shutdown for inclement weather.
    Entity_and_Attribute_Detail_Citation:
    Robbins, L.L., Knorr, P.O., Barrera, K.E., Daly, K.L., 2012, USGS Field Activities 11BHM01 and 11BHM02 on the West Florida Shelf, Gulf of Mexico, in May and June 2011: U.S. Geological Survey Data Series 712, available online at http://pubs.usgs.gov/ds/712/.

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?
    United States Geological Survey St. Petersburg Coastal and Marine Science Center
    Attn: Lisa Robbins
    Research Oceanographer
    600 4th Street South
    St. Petersburg, Florida
    US

    727-502-8005 (voice)
    727-502-8181 (FAX)
    Hours_of_Service: 8am to 5pm M-F EST

Why was the data set created?

The purpose is to study the effects of climate change on ocean acidification within the Gulf of Mexico.

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: 25-Jun-2011 (process 1 of 4)
    Flow-through data was collected using a Sunburst AFT pH, which measures pH on the total hydrogen ion scale, was attached to the flow-through system. This system sampled the seawater approximately every three minutes and has a precision and accuracy of 0.001 and ±0.003, respectively. The Sunburst AFT-CO2 system was used to measure the partial pressure of CO2 in water (pCO2) and was attached to the shipboard flow-through system. The instrument sampled approximately every five minutes and had a precision and accuracy of about 1 ppm and ± 3 ppm, respectively.
    Date: 16-Aug-2012 (process 2 of 4)
    Data entered into a spreadsheet and merged with other data sources: GPS from the ship, as well as the lab results of total alkalinity and disolved inorganic carbon from the USGS St. Petersburg Carbon Analytical Laboratory. Data sources produced in this process:
    • 2011_June_AFT_CO2.csv
    • 2011_June_AFT_CO2.xls
    Date: 16-Aug-2012 (process 3 of 4)
    The spreadsheet was imported into ArcGIS 10 and converted into a shapefile. Data sources used in this process:
    • 2011_June_AFT_CO2.xls
    Date: 13-Mar-2017 (process 4 of 4)
    Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Alan O. Allwardt
    Contractor -- Information Specialist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7551 (voice)
    831-427-4748 (FAX)
    aallwardt@usgs.gov
  3. What similar or related data should the user be aware of?

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?
    These data are collected along tracklines (2-D) and therefore inherently incomplete geologic details between lines must be inferred.
  5. How consistent are the relationships among the observations, including topology?
    The QA/QC process looked for internal consistencies in the data by calculating the results using CO2SYS and back checking with the collected data.

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:
USGS and USF requests to be acknowledged as originator of the data in future products or derivative research.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Attn: Lisa Robbins
    600 4th Street South
    St. Petersburg, Florida
    US

    727-502-8005 (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. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Although all data published in this report have been used by the USGS, no warranty, expressed or implied, is made by the U.S. Geological Survey as to the accuracy of the data and related materials and/or the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data, software, or related materials. Graphical map depictions are intended to be used within the map scale limits applicable to the source data. Although software enables the user to view data at various scales, the user is cautioned to refer to the source documentation for the appropriate map scale limitations.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 13-Mar-2017
Metadata author:
United States Geological Survey St. Petersburg Coastal and Marine Science Center
Attn: Kira E. Barrera
Research Assistant
600 4th Street South
St. Petersburg, Florida
US

727-502-8044 (voice)
727-502-8181 (FAX)
Hours_of_Service: 8am to 5pm M-F EST
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/2011_June_AFT_CO2.faq.html>
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