Physicochemical measurements of the coastal aquifer and coastal groundwater discharge on Kalaupapa, Moloka'i, Hawaii

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Frequently anticipated questions:

What does this data set describe?

Title:
Physicochemical measurements of the coastal aquifer and coastal groundwater discharge on Kalaupapa, Moloka'i, Hawaii
Abstract:
This data table includes in-situ near-shore seawater measurements of excess radon (Rn-222), tide and crater lake water levels and salinity collected in Kalaupapa, Moloka'i, Hawaii.
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=2016-692-FA
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?
    Oberle, Ferdinand K.J., 20221115, Physicochemical measurements of the coastal aquifer and coastal groundwater discharge on Kalaupapa, Moloka'i, Hawaii: data release DOI:10.5066/P9XQAMW8, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -156.9852
    East_Bounding_Coordinate: -156.9660
    North_Bounding_Coordinate: 21.1923
    South_Bounding_Coordinate: 21.1878
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 12-Dec-2014
    Ending_Date: 12-Mar-2017
    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 (464269)
    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 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?
    Kala16_Rn_data.csv
    Comma Separated Value (CSV) file containing data. (Source: Producer Defined)
    Date
    Date and time referenced to Universal Coordinate Time (Source: Global Positioning System)
    Range of values
    Minimum:12/12/14 0:00
    Maximum:3/12/17 17:40
    Units:MM/DD/YY hour:minutes
    Resolution:1
    Excess Radon (dpm/m3)
    Excess Radon (Source: Producer Defined)
    ValueDefinition
    << empty cell >>No data were recorded
    Range of values
    Minimum:301
    Maximum:253832
    Units:Disintegrations per minute per cubic meter
    Resolution:1
    Water Level (m)
    Water Level (Source: Producer Defined)
    Range of values
    Minimum:0.011
    Maximum:6.522
    Units:meters
    Resolution:0.001
    Conductivity (μS/cm)
    Conductivity (Source: Producer Defined)
    ValueDefinition
    << empty cell >>No data were recorded
    Range of values
    Minimum:180
    Maximum:55399
    Units:Microsiemens per centimeter
    Resolution:1
    Latitude (Decimal Degrees)
    Latitude in decimal degrees (Source: Global Positioning System)
    Range of values
    Minimum:21.1878
    Maximum:21.1923
    Units:decimal degrees
    Resolution:0.0001
    Longitude (Decimal Degrees)
    Longitude in decimal degrees (Source: Global Positioning System)
    Range of values
    Minimum:-156.9852
    Maximum:-156.9660
    Units:decimal degrees
    Resolution:0.0001
    Entity_and_Attribute_Overview: The first line of the 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)
    • Ferdinand K.J. Oberle
  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

    831-460-4747 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

Radon (Rn-222) data were collected to characterize the advection rate of groundwater onto the near-shore reef. When analyzed in conjunction with measurements of changing water levels from tides and crater lake water levels, the data can be used to assess the potential for terrestrial groundwater intrusion on the reef and the sources and fate of these water masses.

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: 11-Oct-2022 (process 1 of 1)
    Radon (Rn-222) concentration data were collected with a DURRIDGE RAD7 radon detector. The alpha decay of Rn-222 was detected at 3-minute intervals with the RAD7 in SNIFF mode. In SNIFF mode, the instrument detects radon entry points and gushers, and it recovers from high radon exposures in minutes. At the end of each run, the detector printed out a complete report. The RAD7 data were QA/QC’d, and raw counts of radon were exported using the manufacturer’s CAPTURE software.
  3. What similar or related data should the user be aware of?
    Burnett, W.C., Kim, G., and Lane-Smith, D., 2001, A continuous monitor for assessment of 222Rn in the coastal ocean.

    Online Links:

    Other_Citation_Details:
    Burnett, W.C., Kim, G., and Lane-Smith, D., 2001, A continuous monitor for assessment of 222Rn in the coastal ocean: Journal of Radioanalytical and Nuclear Chemistry, v. 249, p. 167–172

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

  1. How well have the observations been checked?
    No formal attribute accuracy tests were conducted.
  2. How accurate are the geographic locations?
    A formal accuracy assessment of the horizontal positional information in the data set has not been conducted. The stated accuracy of the GPS unit used to determine the location of the instruments is +/- 5 m.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the metadata for each part of this data release carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    Data fall within expected ranges.

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 - ScienceBase
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? These data are available in comma-delimited ascii csv format contained in a single file (Kala16_Rn_data.csv) accompanied by CMGDS FGDC-compliant metadata.
  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?
  5. What hardware or software do I need in order to use the data set?
    These data can be viewed with any text editor software.

Who wrote the metadata?

Dates:
Last modified: 15-Nov-2022
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: PCMSC Science Data Coordinator
2885 Mission Street
Santa Cruz, CA

831-460-4747 (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/ScienceBase/DR_P9XQAMW8/Kala16_Rn_metadata.faq.html>
Generated by mp version 2.9.51 on Thu Nov 17 17:43:41 2022