Conductivity, temperature, depth, salinity, dissolved oxygen, nitrogen, and fluorescence data collected in 2009 in the vicinity of Wainwright, Alaska

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Frequently anticipated questions:

What does this data set describe?

Title:
Conductivity, temperature, depth, salinity, dissolved oxygen, nitrogen, and fluorescence data collected in 2009 in the vicinity of Wainwright, Alaska
Abstract:
Measurements of conductivity, temperature, and depth (CTD), in addition to dissolved oxygen, nitrogen, and fluorescence, were collected in the Wainwright Inlet, the mouth of the Kuk River, and in the nearshore region off Wainwright, Alaska, in August 2009 with a Seabird SBE 19. Post-survey calculations of salinity were made from the conductivity measurements.
Supplemental_Information:
Additional information about the field activity from which these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=TM209AR Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  1. How might this data set be cited?
    Erikson, Li H., Storlazzi, Curt D., and Engelstad, Anita C., 20221217, Conductivity, temperature, depth, salinity, dissolved oxygen, nitrogen, and fluorescence data collected in 2009 in the vicinity of Wainwright, Alaska: data release DOI: 10.5066/P94V9W0S, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Erikson, Li H., Storlazzi, Curt D., Collins, Brian D., Hatcher, Gerry A., Reiss, Thomas E., and Engelstad, Anita C., 2022, Hydrographic and sediment field data collected in the vicinity of Wainwright, Alaska, in 2009: data release DOI: 10.5066/P94V9W0S, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -160.12470
    East_Bounding_Coordinate: -157.69642
    North_Bounding_Coordinate: 71.08850
    South_Bounding_Coordinate: 70.57610
  3. What does it look like?
    CTDcasts_Measurement_Locations.png (JPEG)
    Satellite image showing the locations of CTD casts and the location of the frame where the CTD time series data were collected.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 17-Aug-2009
    Ending_Date: 24-Aug-2009
    Currentness_Reference:
    ground condition at time data were collected
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: comma-delimited text
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point (2677)
    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 0.00001. Longitudes are given to the nearest 0.00001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is 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?
    2009CTDdata_casts.zip
    Measurements of depth, temperature, conductivity, salinity, dissolved oxygen, nitrogen, and fluorescence. (Source: Producer defined)
    Latitude(deg_WGS84)
    Latitude coordinate (Source: Producer defined)
    Range of values
    Minimum:70.57610
    Maximum:71.08850
    Units:Decimal degrees
    Resolution:0.0001
    Longitude(deg_WGS84)
    Longitude coordinate (Source: Producer defined)
    Range of values
    Minimum:-160.12470
    Maximum:-157.69642
    Units:Decimal degrees
    Resolution:0.0001
    year
    Year of acquisition (UTC) (Source: Producer defined)
    Range of values
    Minimum:2009
    Maximum:2009
    Units:year
    Resolution:1
    month
    Month of acquisition (UTC) (Source: Producer defined)
    Range of values
    Minimum:8
    Maximum:8
    Units:month
    Resolution:1
    day
    Day acquisition was started (UTC) (Source: Producer defined)
    Range of values
    Minimum:17
    Maximum:24
    Units:day
    Resolution:1
    hour
    Hour acquisition was started (UTC) (Source: Producer defined)
    Range of values
    Minimum:1
    Maximum:23
    Units:hour
    Resolution:1
    minute
    Minute acquisition was started (UTC) (Source: Producer defined)
    Range of values
    Minimum:1
    Maximum:44
    Units:minute
    Resolution:1
    depth(meters)
    Depth (Source: Producer defined)
    Range of values
    Minimum:0.03
    Maximum:26.17
    Units:meter
    Resolution:0.01
    temperature(degrees_Celsius)
    Temperature (Source: Producer defined)
    Range of values
    Minimum:5.06
    Maximum:8.43
    Units:Degree Celsius
    Resolution:0.01
    conductivity(S/m)
    Conductivity of seawater (Source: Producer defined)
    Range of values
    Minimum:2.8107
    Maximum:3.2641
    Units:Siemens per meter
    Resolution:0.0001
    salinity(psu)
    Salinity of seawater, as calculated from conductivity (Source: Producer defined)
    Range of values
    Minimum:28.403
    Maximum:31.543
    Units:Practical salinity units
    Resolution:0.001
    oxygen(ml/l)
    Dissolved oxygen (Source: Producer defined)
    Range of values
    Minimum:4.484
    Maximum:6.304
    Units:Milliliter per liter
    Resolution:0.001
    nitrogen(mg/l)
    Nitrogen saturation (Source: Producer defined)
    Range of values
    Minimum:15.148
    Maximum:16.511
    Units:Milligram per liter
    Resolution:0.001
    fluorescence(mg/m3)
    Fluorescence (Source: Producer defined)
    Range of values
    Minimum:0.74
    Maximum:7.88
    Units:Milligram per cubic meter
    Resolution:0.01
    Entity_and_Attribute_Overview:
    One csv file is provided for each cast location, and file names contain the longitude and latitude for each location. The first line of each csv file is a header line.
    Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Li H. Erikson
    • Curt D. Storlazzi
    • Anita C. Engelstad
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Attn: PCMSC Science Data Coordinator
    2885 Mission Street
    Santa Cruz, CA

    831-427-4747 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

Data were obtained to provide baseline information and to support the development of numerical models for assessing past and future coastal hazards. These data are intended for policy makers, resource managers, science researchers, students, and the general public. These data are not intended to be used for navigation.

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: 24-Aug-2009 (process 1 of 2)
    Measurements of conductivity, temperature, and depth (CTD), in addition to dissolved oxygen, nitrogen, and fluorescence, were collected in the Wainwright Inlet, the mouth of the Kuk River, and in the nearshore region off Wainwright, Alaska using a Seabird SBE 19, sampling at 4 Hz.
    Date: 02-Oct-2009 (process 2 of 2)
    Post-survey calculations of salinity were computed from the conductivity measurements using methods of PSS78 UNESCO, 1981.
  3. What similar or related data should the user be aware of?
    Unesco, 1981, Background papers and supporting data on the International Equation of State 1980.

    Online Links:

    Other_Citation_Details:
    UNESCO, 1981, Background papers and supporting data on the International Equation of State 1980: UNESCO Technical Paper in Marine Science, no. 38, 25 pp, Paris, France, UNESCO.

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

  1. How well have the observations been checked?
    Conductivity was calibrated by holding the sensor in bottles with solutions of known salinity concentrations and values adjusted on the instrument accordingly. No calibration or formal accuracy tests were performed on the temperature and pressure sensors.
  2. How accurate are the geographic locations?
    A formal accuracy assessment of the horizontal positional information in the dataset has not been conducted. Marine point locations were measured with a hand-held, WAAS enabled Garmin 76CSx GPS unit. Horizontal accuracy is estimated to be 5 meters.
  3. How accurate are the heights or depths?
    A formal accuracy assessment of the vertical positional information in the data set has not been conducted. Water depths associated with CTD measurements were determined from the pressure sensor and are expected to be accurate within 0.01 m.
  4. Where are the gaps in the data? What is missing?
    Dataset is considered complete for the information presented, as described in the abstract.
  5. How consistent are the relationships among the observations, including topology?
    All data fall within expected ranges. Missing data have been filled with -9999 values.

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-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - CMGDS
    2885 Mission Street
    Santa Cruz, CA

    831-427-4747 (voice)
    pcmsc_data@usgs.gov Resource_Description: These data are available in csv format.
  2. What's the catalog number I need to order this data set?
  3. What legal disclaimers am I supposed to read?
    Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: zip file contains cast data of conductivity, temperature, depth, salinity, oxygen, nitrogen, and fluorescence. in format comma-delimited text Size: 0.042
      Network links: https://doi.org/10.5066/P94V9W0S
    • Cost to order the data: None.

  5. What hardware or software do I need in order to use the data set?
    The csv data can be viewed with any text reading software.

Who wrote the metadata?

Dates:
Last modified: 17-Dec-2022
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: PCMSC Science Data Coordinator
2885 Mission Street
Santa Cruz, CA

831-427-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/CMGDS_DR_tool/DR_P94V9W0S/2009CTDdata_casts_metadata.faq.html>
Generated by mp version 2.9.51 on Thu Dec 22 15:35:39 2022