Photosynthetically Active Radiation (PAR) Long-term Mean, 2002-2013 - Hawaii

Solar irradiance is one of the most important factors influencing coral reefs. As the majority of their nutrients are obtained from symbiotic photosynthesizing organisms, reef-building corals need irradiance 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. This layer represents the mean of 8-day time series of irradiance (mol/m2/day) from July 2002 to December 31, 2013. Irradiance is here represented by PAR (photosynthetically active radiation), which is the spectrum of light that is important for photosynthesis. Monthly and 8-day 4-km (0.0417-degree) spatial resolution data were obtained from the MODIS (Moderate-resolution Imaging Spectroradiometer) Aqua satellite instrument from the NASA OceanColor website (http://oceancolor.gsfc.nasa.gov).

The PAR long-term mean was calculated by taking the average of all 8-day data from 2002-2013 for each pixel. A quality control mask was applied to remove spurious data associated with shallow water, following Gove et al., 2013. 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 e Risorse

Campo Valore
access_constraints []
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bbox-north-lat 22.42373568629166
bbox-south-lat 18.755036208219373
bbox-west-long -160.41246354980814
contact-email kappel@nceas.ucsb.edu
coupled-resource [{"title": [], "href": ["#DataIdentification"], "uuid": []}, {"title": [], "href": ["#DataIdentification"], "uuid": []}]
dataset-reference-date [{"type": "creation", "value": "2017-03-14"}, {"type": "issued", "value": "2017-03-14"}, {"type": "revision", "value": "2017-03-14"}]
graphic-preview-description Sample image.
graphic-preview-file http://pacioos.org/metadata/browse/hi_otp_all_par_avg.png
guid hi_otp_all_par_avg
licence []
lineage 2017-03-14T00:00:00Z 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-date 2024-11-14
metadata-language eng
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responsible-party [{"name": "National Center for Ecological Analysis and Synthesis (NCEAS)", "roles": ["pointOfContact"]}]
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spatial-data-service-type Open Geospatial Consortium Web Coverage Service (WCS)
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Gruppi
  • AmeriGEOSS
  • National Provider
  • North America
Tag
  • AmeriGEO
  • AmeriGEOSS
  • CKAN
  • GEO
  • GEOSS
  • National
  • North America
  • United States
  • aquatic ecosystems
  • biosphere
  • central pacific ocean
  • coastal areas
  • coastal processes
  • continent
  • coral reef
  • coral reefs
  • earth science
  • ecosystems
  • hawaii
  • hawaiian islands
  • human dimensions
  • human settlements
  • marine ecosystems
  • north america
  • ocean
  • ocean optics
  • oceans
  • pacific islands ocean observing system
  • pacific ocean
  • pacioos
  • photosynthetically active radiation
  • reef
  • reef habitat
  • united states of america
  • vegetation
isopen False
metadata_created 2025-09-23T23:16:52.417205
metadata_modified 2025-09-23T23:16:52.417213
notes Solar irradiance is one of the most important factors influencing coral reefs. As the majority of their nutrients are obtained from symbiotic photosynthesizing organisms, reef-building corals need irradiance 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. This layer represents the mean of 8-day time series of irradiance (mol/m2/day) from July 2002 to December 31, 2013. Irradiance is here represented by PAR (photosynthetically active radiation), which is the spectrum of light that is important for photosynthesis. Monthly and 8-day 4-km (0.0417-degree) spatial resolution data were obtained from the MODIS (Moderate-resolution Imaging Spectroradiometer) Aqua satellite instrument from the NASA OceanColor website (http://oceancolor.gsfc.nasa.gov). The PAR long-term mean was calculated by taking the average of all 8-day data from 2002-2013 for each pixel. A quality control mask was applied to remove spurious data associated with shallow water, following Gove et al., 2013. 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.
num_resources 13
num_tags 35
title Photosynthetically Active Radiation (PAR) Long-term Mean, 2002-2013 - Hawaii