Chlorophyll-a Average Annual Frequency of Anomalies, 1998-2018 - American Samoa

Chlorophyll-a, is a widely used proxy for phytoplankton biomass and an indicator for changes in phytoplankton production. As an essential source of energy in the marine environment, the extent and availability of phytoplankton biomass can be highly influential for fisheries production and dictate trophic structure in marine ecosystems. Changes in phytoplankton biomass are predominantly effected by changes in nutrient availability, through either natural (e.g., turbulent ocean mixing) or anthropogenic (e.g., agricultural runoff) processes. This layer represents the annual average number of anomalies of chlorophyll-a (mg/m3) from 1998-2018, with values presented as fraction of a year. Data products generated by the Ocean Colour component of the European Space Agency (ESA) Climate Change Initiative (CCI) project. These files are 8-day 4-km composites of merged sensor products: Global Area Coverage (GAC), Local Area Coverage (LAC), MEdium Resolution Imaging Spectrometer (MERIS), Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua, Ocean and Land Colour Instrument (OLCI), Sea-viewing Wide Field-of-view Sensor (SeaWiFS), and Visible Infrared Imaging Radiometer Suite (VIIRS). The chlorophyll-a average annual frequency of anomalies was calculated by taking the average number of times that the 8-day time series exceeded the maximum monthly climatological chlorophyll-a value from 1998-2018 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 source: https://oceanwatch.pifsc.noaa.gov/erddap/griddap/esa-cci-chla-8d-v5-0.graph

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Metadata Date

2021-09-07

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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 European Space Agency (ESA) Climate Change Initiative (CCI)
climate.office@esa.int
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 European Space Agency (ESA) Climate Change Initiative (CCI)
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: -10.77649° S: -14.73203864432298° E: -167.82501847376378° W: -171.33852999999996°
Theme keywords GCMD Science Keywords
  • Earth Science > Biosphere > Aquatic Ecosystems > Reef Habitat
  • Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Reef > Coral Reef
  • Earth Science > Human Dimensions > Human Settlements > Coastal Areas
  • Earth Science > Oceans > Coastal Processes > Coral Reefs
  • Earth Science > Oceans > Ocean Chemistry > Chlorophyll
  • Earth Science > Oceans > Ocean Optics > Ocean Color
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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