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    • Wave Power Long-term Mean, 2002-2012 - American Samoa

    Metadata Updated: October 6, 2023

    Wave power is a major environmental forcing mechanism that influences a number of marine ecosystem processes including coral reef community development, structure, and persistence. By driving mixing of the upper water column, wave forcing can also play a role in nutrient availability and ocean temperature reduction during warming events. Wave forcing can be highly seasonal, with winter months typically experiencing far greater wave power than that experienced during the summer months. This layer represents the mean of maximum daily wave power (kW/m) from 2002-2012.

    In the absence of numerical wave model and wave forcing observational site-level data at the desired spatial resolution, a wave exposure proxy, developed by S. Jeanette Clark, is used to examine wave exposure. Wave energy estimates were derived at 1-km resolution utilizing NOAA WaveWatch III (WW3) global 0.5-deg wave model data and coastline analysis of wave exposure. This is achieved by: 1) Determining the incident wave swath for a specific site at an island using a 360-degree radial plot and degree-bin elimination based on a swath's intersection with land or relevant bathymetric contour. 2) Selecting the closest WW3 pixel and extracting the time series for significant wave height, peak period, and peak direction. 3) Calculating wave power (kW/m) with significant wave height and peak period using the following equation:

    Ef = pg / 64pi * Hs^2 * Tp / 1000

    where p is the density of sea water (1024 kg m-3), g is the acceleration of gravity (9.8 m s-2), Hs is the offshore significant wave height, and Tp is the dominant wave period (1/wavelength). 4) Lastly, annual wave power data are filtered and organized into respective degree bins based on peak direction and summed to give a wave power estimate at each site. The wave power metric calculated here is based on offshore wave height and does not account for variation with depth.

    Access & Use Information

    License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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    Dates

    Metadata Date September 7, 2021
    Metadata Created Date October 6, 2023
    Metadata Updated Date October 6, 2023
    Reference Date(s) September 7, 2021 (creation), September 7, 2021 (issued), September 7, 2021 (revision)
    Frequency Of Update

    Metadata Source

    Harvested from ioos

    Other Data Resources

    Graphic Preview

    Sample image.

    Additional Metadata

    Resource Type Dataset
    Metadata Date September 7, 2021
    Metadata Created Date October 6, 2023
    Metadata Updated Date October 6, 2023
    Reference Date(s) September 7, 2021 (creation), September 7, 2021 (issued), September 7, 2021 (revision)
    Responsible Party NOAA Pacific Islands Fisheries Science Center (PIFSC) (Point of Contact)
    Contact Email
    Guid as_noaa_all_wave_avg
    Access Constraints
    Bbox East Long -168.05000766975851
    Bbox North Lat -10.98991400271496
    Bbox South Lat -14.657083553388734
    Bbox West Long -171.14318546467464
    Coupled Resource [{"title": [], "href": ["#DataIdentification"], "uuid": []}, {"title": [], "href": ["#DataIdentification"], "uuid": []}, {"title": [], "href": ["#DataIdentification"], "uuid": []}]
    Frequency Of Update
    Graphic Preview Description Sample image.
    Graphic Preview File http://pacioos.org/metadata/browse/as_noaa_all_wave_avg.png
    Harvest Object Id e2241ee5-6d35-459d-97cd-b5341cbcdb3b
    Harvest Source Id 54e15a6e-6dde-4c9c-a8f0-345cc0dfccfb
    Harvest Source Title ioos
    Licence
    Lineage 2021-09-07T00:00:00Z OGC web services (WMS and WFS) enabled by PacIOOS via GeoServer. Original data from source provider may have been reformatted, reprojected, or adjusted in other ways to optimize these capabilities.
    Metadata Language eng
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-171.14318546467464, -14.657083553388734], [-168.05000766975851, -14.657083553388734], [-168.05000766975851, -10.98991400271496], [-171.14318546467464, -10.98991400271496], [-171.14318546467464, -14.657083553388734]]]}
    Progress
    Spatial Data Service Type Open Geospatial Consortium Web Coverage Service (WCS)
    Spatial Reference System
    Spatial Harvester True

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