as_noaa_all_turb_std NOAA Pacific Islands Fisheries Science Center (PIFSC) NOAA Coral Reef Conservation Program (CRCP) European Space Agency (ESA) Climate Change Initiative (CCI) 20210907 Spectrally resolved water-leaving radiances (ocean color) and inferred chlorophyll concentration are key to studying phytoplankton dynamics at seasonal and inter-annual scales, for a better understanding of the role of phytoplankton in marine biogeochemistry; the global carbon cycle; and the response of marine ecosystems to climate variability, change, and feedback processes. Ocean color data also have a critical role in operational observation systems monitoring coastal eutrophication, harmful algal blooms, and sediment plumes. The contiguous ocean color record reached 21 years in 2018. However, it is comprised of a number of one-off missions such that creating a consistent time series of ocean color data requires merging of the individual sensors without introducing artifacts. The diffuse attenuation coefficient at 490 nm (Kd490) indicates the turbidity of the water column: i.e., how well visible light in the blue to green region of the spectrum penetrates the water column. The value of Kd490 represents the rate at which light at 490 nm is attenuated with depth. For example, a Kd490 of 0.1 per meter means that light intensity is reduced by one natural log within 10 meters of water. Thus, for a Kd490 of 0.1, one attenuation length is 10 meters. Higher Kd490 values mean shallower attenuation depths and thus higher turbidity, or lower clarity, of ocean water. This layer represents the standard deviation of the 8-day time series of Kd490 (m-1) from 1998-2018. 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 standard deviation was calculated over all 8-day Kd490 data 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-kd-8d-v5-0.graph These layers were developed as part of a geospatial database of key anthropogenic and environmental pressures to coastal waters of American Samoa. -171.33852794082935 -167.8250200967191 -10.776491753888738 -14.732036252835169 http://pacioos.org/metadata/browse/as_noaa_all_turb_std.png Sample image. PNG 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 Optics > Turbidity > > > Kd490 Earth Science > Oceans > Water Quality 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 None Use Limitation: 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. NOAA Pacific Islands Fisheries Science Center (PIFSC) physical and mailing

Unknown pifsc.info@noaa.gov Please acknowledge the Ecosystem Sciences Division of the NOAA Pacific Islands Fisheries Science Center, Honolulu, Hawaii. Pacific Islands Ocean Observing System (PacIOOS) physical and mailing

Unknown info@pacioos.org Unknown Open Geospatial Consortium Web Coverage Service (WCS) https://geo.pacioos.hawaii.edu/geoserver/PACIOOS/as_noaa_all_turb_std/ows?service=WCS&version=1.0.0&request=GetCapabilities Open Geospatial Consortium Web Map Service (WMS) https://geo.pacioos.hawaii.edu/geoserver/PACIOOS/as_noaa_all_turb_std/ows?service=WMS&version=1.3.0&request=GetCapabilities GeoServer This URL provides access to this dataset via GeoServer, including multiple output formats and an OpenLayers viewer. https://geo.pacioos.hawaii.edu/geoserver/ PacIOOS: American Samoa Coral Reef Drivers This URL provides a viewer and/or data access for this dataset. http://pacioos.org/projects/coral-drivers-amsam/ None specified 20260624 NOAA Pacific Islands Fisheries Science Center (PIFSC) mailing and physical Unknown pifsc.info@noaa.gov Content Standard for Digital Geospatial Metadata: Extensions for Remote Sensing Metadata FGDC-STD-012-2002