National Coral Reef Monitoring Program: Shallow water conductivity-temperature-depth (CTD) profiles for selected locations across American Samoa

Near-shore shallow water Conductivity-Temperature-Depth (CTD) surveys provided in this collection were conducted at selected sites around American Samoa as part of the ongoing National Coral Reef Monitoring Program (NCRMP). Shallow water CTD surveys provide vertical profiles of temperature, salinity, and turbidity providing indications for water masses and local sea water chemistry changes. These surveys are conducted to characterize the spatial structure of the physical and chemical properties of the ocean environment influencing the living coral reef resources observed during Rapid Ecological Assessments (REA) and towed-diver surveys, both of which are archived separately.

Shallow CTD casts are vertical profiles (max 30 meter depth, downcast only) of water column conductivity, temperature, and pressure (Sea-Bird Electronics, SBE19-plus; accuracy of 0.005 S m-1 in conductivity, 0.0002C in temperature, and 0.1% in pressure). A transmissometer (Wetlabs Inc; provides profiles of beam transmittance, related to turbidity) and a dissolved oxygen sensor (Sea-Bird Electronics, SBE43; accuracy of 2% of saturation) are also attached. Data are collected by lowering the CTD in a profiling mode from a small boat at a descent rate of approximately 0.5 to 0.75m s-1 to a maximum depth of 30m. Data processing is performed using Seabird Instrument's SeaSoft SBE Data Processing Software.

Data and Resources

Additional Info

Field Value
Last Updated May 7, 2020, 20:10
Created October 23, 2018, 19:27
access_constraints ["Cite as: NOAA Pacific Islands Fisheries Science Center, Ecosystem Sciences Division (2018). National Coral Reef Monitoring Program: Shallow water conductivity-temperature-depth (CTD) profiles for selected locations across American Samoa. [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. Accessed [date].", "Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose."]
bbox-east-long -168.145
bbox-north-lat -11.0457
bbox-south-lat -14.6519
bbox-west-long -171.101
coupled-resource []
dataset-reference-date [{"type": "publication", "value": "2018-03-07"}, {"type": "revision", "value": "2017-03-18"}]
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graphic-preview-description Preview graphic
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guid gov.noaa.nodc:NCRMP-CTD-AmSam
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metadata-date 2019-12-09T13:52:50Z
metadata-language eng
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spatial {"type": "Polygon", "coordinates": [[[-171.101, -14.6519], [-168.145, -14.6519], [-168.145, -11.0457], [-171.101, -11.0457], [-171.101, -14.6519]]]}
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temporal-extent-begin 2015-02-15