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Honolulu King Tide Study: Radon Time Series

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Created: Dec 14, 2020 at 8:48 p.m.
Last updated: Dec 14, 2020 at 8:50 p.m.
DOI: 10.4211/hs.14cc6984035d4fb4aa4e653e1625d0bd
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Time series results by study site and sampling date (including king tide vs. spring tide sampling for coastal sites). Data collected include time, water temperature, water salinity, water depth, and radon concentrations in water.

Subject Keywords



Start Date:
End Date:


‘Ike Wai:

In 2016, University of Hawai‘i launched the Hawai‘i EPSCoR ‘Ike Wai project supported by the National Science Foundation (Award # OIA-1557349) The five-year project uses integrated research, education, and community engagement efforts aimed to ensure Hawai‘i’s future water security and promote resource management within the state that is sustainable, responsible, and data-driven.

To save space on Hydroshare, all ‘Ike Wai project files are stored at the University of Hawai‘i and linked here. Please use the following link(s) to see the files for this resource.


  • Radon uncertainty

    id: Rn_unc

    description: 2-sigma uncertainty for radon activities in water (Bq/m3), determined using the Durridge Capture RAD7 Data Acquisition and Analysis Software.

    unit: becquerels per cubic meter(Bq/m3)

  • Radon-222

    id: Rn_Bqm3

    description: Rn_Bqm3 (discrete) = Radon concentrations (Bq/m3) measured using a Durridge RAD7 radon-in-air detector with water analysis accessory. Samples were collected in the field into 250 mL glass borosilicate bottles without headspace and analyzed the same day upon returning from the field. All discrete samples were decay corrected to the time of sample collection. Rn_Bqm3 (time series) = Radon concentrations in water (Bq/m3) measured using a Durridge RAD7 radon-in-air detector with RAD-AQUA air-water exchanger. Water was continuously pumped from the sample site (surface water or storm drain water) by a peristaltic pump through Masterflex tubing into the air-water exchanger, which extracts the radon gas in a closed loop system and sends it to the detector for analysis in the field.

    value type: Field Observation

    unit: becquerels per cubic meter(Bq/m3)

  • Water depth

    id: CTD_depth_m

    description: Water depth at the sampling site in meters, measured with a CTD Diver

    unit: meter(m)

  • Salinity

    id: CTD_salinity

    description: Water salinity at the sampling site, measured with a CTD diver

  • Temperature, sensor

    id: CTD_temp_C

    unit: degree celsius(degC)

    description: Water temperature at the sampling site, measured with a CTD Diver in degrees Celsius

  • Time Stamp

    id: Time

    description: Time of sampling - 24-hour time, HH:MM, in Hawaii Standard Time (HST)

  • undefined

    id: Site

    description: Study site and date (MM/DD/YY format) sampled, CA = Canal CO = Coastal SD = Storm drain #’s following CA, CO, or SD delineate a specific site. KT = King Tide ST = Spring Tide. All dates in Hawaii Standard Time (HST)


Funding Agencies

This resource was created using funding from the following sources:
Agency Name Award Title Award Number
National Science Foundation ‘Ike Wai: Securing Hawaii’s Water Future Award OIA-1557349


People or Organizations that contributed technically, materially, financially, or provided general support for the creation of the resource's content but are not considered authors.

Name Organization Address Phone Author Identifiers
Trista McKenzie
Shellie Habel University of Hawaiʻi Sea Grant and Hawaiʻi Office of Conservation and Coastal Land
Henrietta Dulai University of Hawaiʻi at Manoa

How to Cite

McKenzie, T., S. Habel, H. Dulai (2020). Honolulu King Tide Study: Radon Time Series, HydroShare,

This resource is shared under the Creative Commons Attribution CC BY.


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