Photosynthetically Active Radiation (PAR) Average Annual Frequency of Anomalies, 2003-2018 - American Samoa
Solar irradiance is one of the most important factors influencing coral reefs. As a majority of their nutrients are obtained from symbiotic photosynthesizing organisms, reef-building corals need sunlight as a fundamental source of energy. Seasonally low irradiance at high latitudes may be linked to reduced growth rates in corals and may limit reef calcification to shallower depths than that observed at lower latitudes. However, high levels of irradiance can lead to light-induced damage, production of free radicals, and in combination with increased temperatures, can exacerbate coral bleaching. Irradiance is here represented by PAR (photosynthetically active radiation), which is the spectrum of light that is important for photosynthesis. This layer represents the annual average number of anomalies of PAR (mol/m2/day) from 2003-2018, with values presented as fraction of a year.
Data for PAR for the time period 2003-2018 were obtained from the Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua satellite instrument from the NASA OceanColor website as 8-day 4-km composites.
The PAR average annual frequency of anomalies was calculated by taking the average number of weeks that exceeded the maximum monthly climatological PAR value from 2003-2018 for each pixel. A quality control mask was applied to remove spurious data associated with shallow water, following Gove et al., 2013. Time series of anomalies were calculated by quantifying the number and magnitude of events from the 8-day time series that exceed the maximum climatological monthly mean. Nearshore map pixels with no data were filled with values from the nearest neighboring valid offshore pixel by using a grid of points and the Near Analysis tool in ArcGIS then converting points to raster.
Data source: https://oceanwatch.pifsc.noaa.gov/erddap/griddap/aqua_par_8d_2018_0.graph
Complete Metadata
| @type | dcat:Dataset |
|---|---|
| accessLevel | public |
| contactPoint |
{
"fn": "NOAA Pacific Islands Fisheries Science Center (PIFSC)",
"@type": "vcard:Contact",
"hasEmail": "mailto:pifsc.info@noaa.gov"
}
|
| describedByType | application/octet-steam |
| description | Solar irradiance is one of the most important factors influencing coral reefs. As a majority of their nutrients are obtained from symbiotic photosynthesizing organisms, reef-building corals need sunlight as a fundamental source of energy. Seasonally low irradiance at high latitudes may be linked to reduced growth rates in corals and may limit reef calcification to shallower depths than that observed at lower latitudes. However, high levels of irradiance can lead to light-induced damage, production of free radicals, and in combination with increased temperatures, can exacerbate coral bleaching. Irradiance is here represented by PAR (photosynthetically active radiation), which is the spectrum of light that is important for photosynthesis. This layer represents the annual average number of anomalies of PAR (mol/m2/day) from 2003-2018, with values presented as fraction of a year. Data for PAR for the time period 2003-2018 were obtained from the Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua satellite instrument from the NASA OceanColor website as 8-day 4-km composites. The PAR average annual frequency of anomalies was calculated by taking the average number of weeks that exceeded the maximum monthly climatological PAR value from 2003-2018 for each pixel. A quality control mask was applied to remove spurious data associated with shallow water, following Gove et al., 2013. Time series of anomalies were calculated by quantifying the number and magnitude of events from the 8-day time series that exceed the maximum climatological monthly mean. Nearshore map pixels with no data were filled with values from the nearest neighboring valid offshore pixel by using a grid of points and the Near Analysis tool in ArcGIS then converting points to raster. Data source: https://oceanwatch.pifsc.noaa.gov/erddap/griddap/aqua_par_8d_2018_0.graph |
| distribution |
[
{
"@type": "dcat:Distribution",
"title": "GeoServer",
"mediaType": "placeholder/value",
"description": "This URL provides access to this dataset via GeoServer, including multiple output formats and an OpenLayers viewer.",
"downloadURL": "https://geo.pacioos.hawaii.edu/geoserver/",
"describedByType": "application/octet-steam"
},
{
"@type": "dcat:Distribution",
"title": "PacIOOS: American Samoa Coral Reef Drivers",
"mediaType": "placeholder/value",
"description": "This URL provides a viewer and/or data access for this dataset.",
"downloadURL": "http://pacioos.org/projects/coral-drivers-amsam/",
"describedByType": "application/octet-steam"
},
{
"@type": "dcat:Distribution",
"mediaType": "placeholder/value",
"downloadURL": "https://www.fisheries.noaa.gov/about/pacific-islands-fisheries-science-center",
"describedByType": "application/octet-steam"
}
]
|
| identifier | as_noaa_all_par_anom_freq |
| isPartOf | Pacific Islands Ocean Observing System (PacIOOS) |
| issued | 2021-09-07T00:00:00.000+00:00 |
| keyword |
[
"Earth Science > Biosphere > Aquatic Ecosystems > Reef Habitat",
"Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Reef > Coral Reef",
"Earth Science > Biosphere > Vegetation > Photosynthetically Active Radiation",
"Earth Science > Human Dimensions > Human Settlements > Coastal Areas",
"Earth Science > Oceans > Coastal Processes > Coral Reefs",
"Earth Science > Oceans > Ocean Optics > Photosynthetically Active Radiation",
"Ocean > Pacific Ocean > South Pacific Ocean > Polynesia > American Samoa > Manua",
"Ocean > Pacific Ocean > South Pacific Ocean > Polynesia > American Samoa > Ofu",
"Ocean > Pacific Ocean > South Pacific Ocean > Polynesia > American Samoa > Olosega",
"Ocean > Pacific Ocean > South Pacific Ocean > Polynesia > American Samoa > Rose Atoll",
"Ocean > Pacific Ocean > South Pacific Ocean > Polynesia > American Samoa > Swains",
"Ocean > Pacific Ocean > South Pacific Ocean > Polynesia > American Samoa > Tau",
"Ocean > Pacific Ocean > South Pacific Ocean > Polynesia > American Samoa > Tutuila",
"PacIOOS > Pacific Islands Ocean Observing System",
"PacIOOS > Pacific Islands Ocean Observing System"
]
|
| landingPage | https://www.fisheries.noaa.gov/about/pacific-islands-fisheries-science-center |
| language |
[]
|
| license | https://creativecommons.org/publicdomain/zero/1.0/ |
| modified | 2021-09-07T00:00:00.000+00:00 |
| publisher |
{
"name": "Pacific Islands Ocean Observing System (PacIOOS)",
"@type": "org:Organization"
}
|
| spatial | -167.82502343885935,-14.732043054565562,-171.33852999999996,-10.7765 |
| title | Photosynthetically Active Radiation (PAR) Average Annual Frequency of Anomalies, 2003-2018 - American Samoa |
