Photosynthetically Active Radiation (PAR) Average Annual Maximum Anomaly, 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 of the maximum anomaly of PAR (mol/m2/day) from 2003-2018. 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 maximum average annual anomaly was calculated by taking the average of the annual maximum PAR values in exceedance of the maximum monthly climatological PAR 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

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Distributor NOAA Pacific Islands Fisheries Science Center (PIFSC)
Point of Contact NOAA Pacific Islands Fisheries Science Center (PIFSC)
pifsc.info@noaa.gov
Online Resource
Originator NOAA Pacific Islands Fisheries Science Center (PIFSC)
pifsc.info@noaa.gov
Online Resource
Originator NOAA Coral Reef Conservation Program (CRCP)
coralreef@noaa.gov
Online Resource
Resource Provider NASA Ocean Biology Processing Group (OBPG)
Online Resource
Publisher Pacific Islands Ocean Observing System (PacIOOS)
info@pacioos.org
Online Resource
Dataset Point of Contact Pacific Islands Ocean Observing System (PacIOOS)
info@pacioos.org
General Documentation
Associated Documentation Pacific Islands Ocean Observing System (PacIOOS)
Resource Provider NASA Ocean Biology Processing Group (OBPG)
Date(s) creation: 2021-09-07
issued: 2021-09-07
revision: 2021-09-07
creation: 2021-09-07
issued: 2021-09-07
revision: 2021-09-07
creation: 2021-09-07
issued: 2021-09-07
revision: 2021-09-07
creation: 2021-09-07
issued: 2021-09-07
revision: 2021-09-07
Purpose These layers were developed as part of a geospatial database of key anthropogenic and environmental pressures to coastal waters of American Samoa.
Use Limitations The data may be used and redistributed for free but is not intended for legal use, since it may contain inaccuracies. Neither the data Contributor, University of Hawaii, PacIOOS, NOAA, State of Hawaii nor the United States Government, nor any of their employees or contractors, makes any warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, or assumes any legal liability for the accuracy, completeness, or usefulness, of this information.
Spatial Bounding Box Coordinates N: -10.776496516692129° S: -14.732041047992729° E: -167.82502007000386° W: -171.33852794285266°
Theme keywords GCMD Science Keywords
  • 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

Data Center keywords GCMD Data Center Keywords
  • PacIOOS > Pacific Islands Ocean Observing System

Place keywords GCMD Location Keywords
  • 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

Project keywords GCMD Project Keywords
  • PacIOOS > Pacific Islands Ocean Observing System

Use Constraints The data may be used and redistributed for free but is not intended for legal use, since it may contain inaccuracies. Neither the data Contributor, University of Hawaii, PacIOOS, NOAA, State of Hawaii nor the United States Government, nor any of their employees or contractors, makes any warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, or assumes any legal liability for the accuracy, completeness, or usefulness, of this information.
Lineage Statement 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.
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