ERDDAP > info > sentinel_3A_POLYMER

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 data       graph  M    files  Daily satellite (Sentinel 3A and 3B) chlorophyll and suspended matter concentrations for
coastal British Columbia and southeast Alaska 		   ?   F   I   M   background RSS Subscribe Hakai Institute sentinel_3A_POLYMER

The Dataset's Variables and Attributes

Row Type Variable Name Attribute Name Data Type Value
attribute NC_GLOBAL _NCProperties String version=2,netcdf=4.9.2,hdf5=1.14.0
attribute NC_GLOBAL cdm_data_type String Grid
attribute NC_GLOBAL citation String Costa, M., & Hakai Institute. (2023). Sentinel-3A OLCI Imagery - Automated daily POLYMER processed satellite chlorophyll concentrations for coastal British Columbia and southeast Alaska (Version v1). Hakai Institute
attribute NC_GLOBAL comment String ##Limitations:
Product is the best regionally evaluated output, but methods may evolve. Satellite derived chlorophyll and SPM concentrations contain error.
attribute NC_GLOBAL contributor_name String Costa, Maycira;Hakai Institute
attribute NC_GLOBAL contributor_role String originator,collaborator,principalInvestigator;custodian,owner,pointOfContact,resourceProvider,processor,publisher,distributor,funder
attribute NC_GLOBAL Conventions String CF-1.6, COARDS, ACDD-1.3
attribute NC_GLOBAL creator_city String Campbell River
attribute NC_GLOBAL creator_country String Canada
attribute NC_GLOBAL creator_email String algaeexplorer at hakai.org
attribute NC_GLOBAL creator_institution String Hakai Institute
attribute NC_GLOBAL creator_name String Hakai Institute
attribute NC_GLOBAL creator_ror String https://ror.org/02pry0c91 (external link)
attribute NC_GLOBAL creator_type String institution
attribute NC_GLOBAL creator_url String https://www.hakai.org/ (external link)
attribute NC_GLOBAL date_created String 2024-03-14
attribute NC_GLOBAL date_modified String 2024-03-14T18:15:26.449Z
attribute NC_GLOBAL doi String https://doi.org/10.21966/dveq-bt48 (external link)
attribute NC_GLOBAL Easternmost_Easting double -121.50441152648823
attribute NC_GLOBAL geospatial_lat_max double 59.500000000000014
attribute NC_GLOBAL geospatial_lat_min double 47.003527851418525
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_max double -121.50441152648823
attribute NC_GLOBAL geospatial_lon_min double -139.0
attribute NC_GLOBAL geospatial_lon_resolution double 0.0026949458523585603
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL id String d1bef0b7-4d15-4bc1-bf34-faca6352891f
attribute NC_GLOBAL infoUrl String https://catalogue.hakai.org/dataset/ca-cioos_d1bef0b7-4d15-4bc1-bf34-faca6352891f
attribute NC_GLOBAL institution String Hakai Institute
attribute NC_GLOBAL keywords String abundance and biomass, chlorophyll a, coastal zone, phytoplankton, remote sensing, water quality
attribute NC_GLOBAL keywords_vocabulary String CIOOS: CIOOS Essential Ocean Variables Vocabulary
attribute NC_GLOBAL license String https://creativecommons.org/licenses/by/4.0 (external link)
attribute NC_GLOBAL metadata_form String https://hakaiinstitute.github.io/hakai-metadata-entry-form#/en/hakai/7U7b8oPpeTN6gjvXlUCTGJr5pga2/-NTteirxDjvnABVz_7Dh (external link)
attribute NC_GLOBAL metadata_link String https://catalogue.hakai.org/dataset/ca-cioos_d1bef0b7-4d15-4bc1-bf34-faca6352891f
attribute NC_GLOBAL metadata_profile String beam
attribute NC_GLOBAL metadata_version String 0.5
attribute NC_GLOBAL naming_authority String ca.cioos
attribute NC_GLOBAL Northernmost_Northing double 59.500000000000014
attribute NC_GLOBAL platform String satellite
attribute NC_GLOBAL platform_vocabulary String https://vocab.nerc.ac.uk/collection/L06/current/ (external link)
attribute NC_GLOBAL product_type String BEAM_MOSAIC
attribute NC_GLOBAL product_version String 1
attribute NC_GLOBAL progress String onGoing
attribute NC_GLOBAL project String Oceanography
attribute NC_GLOBAL publisher_city String Campbell River
attribute NC_GLOBAL publisher_country String Canada
attribute NC_GLOBAL publisher_email String algaeexplorer at hakai.org
attribute NC_GLOBAL publisher_institution String Hakai Institute
attribute NC_GLOBAL publisher_name String Hakai Institute
attribute NC_GLOBAL publisher_ror String https://ror.org/02pry0c91 (external link)
attribute NC_GLOBAL publisher_type String institution
attribute NC_GLOBAL publisher_url String https://www.hakai.org/ (external link)
attribute NC_GLOBAL references String https://doi.org/ (external link)
attribute NC_GLOBAL sourceUrl String (local files)
attribute NC_GLOBAL Southernmost_Northing double 47.003527851418525
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v81
attribute NC_GLOBAL summary String This is an ongoing dataset of fully processed daily Sentinel 3A and 3B chlorophyll-a (Chla) and suspended particulate matter (SPM) imagery for coastal and offshore British Columbia (BC) and Southeast Alaska waters. Setinel 3A and 3B are European Space Agency (ESA) oceanography satellites jointly operated with the European Organization for the Exploitation of Meteorological Satellites (EUMETSAT). The ocean and land colour instrument (OLCI) onboard both satellites has a 300m spatial resolution, near daily temporal coverage (when 3A and 3B are combined), 21 spectral bands from 400-1200nm, high signal-to-noise ratio and an off-nadir swath centered to minimize ocean sun glint. These features make the instruments well suited to retrievals of biogeochemical products from optically complex coastal waters.

At the University of Victoria (BC, Canada), the SPECTRAL remote sensing laboratory has performed extensive evaluation of methods for the best regional Chla and SPM retrievals. Validation with in-situ data showed the best results using Level-1 imagery processed with the POLYnomial based algorithm applied to MERIS (POLYMER) processor. Following validation, the SPECTRAL laboratory and the MOD(ularity) Squad developed an automated processing system that: 1) downloads imagery from the Marine Copernicus Online Data Access (CODA) web service; 2) applies POLYMER and flagging and; 3) mosaics the imagery for fully processed Chla and SPM concentrations over the study region. Additionally, an interactive public web interface was created to view the near real time outputs at www.algaeexplorer.ca (provided in resources). Full validation details are provided in Giannini et al. (2021) and processing details in Jacoby et al. (2019) and Marchese et al. (2022) referenced in the resources.

In 2022, the Hakai Institute took responsibility of the project, added processing of 3B imagery, created automated submission to the Canadian Integrated Ocean Observing System (CIOOS) and updated the Algae Explorer web interface.

This product provides the best known regional OLCI Chla and SPM retrievals shown to have low systematic biases (<1%) and follow expected seasonal and spatial trends; however, relative percent difference between validation data and satellite retrievals was high notably for Chla (~83%) due to the underestimation of high Chla concentrations and potentially an artifact of spatial-temporal mismatches between validation samples and image pixels. The SPECTRAL laboratory has performed initial radiometric comparisons of 3A and 3B imagery and shown highly comparable data; however, comparison of biogeochemical outputs is still in progress. Further uncertainties exist in high turbidity regions (Fraser River plume and fjords) where uncorrectable poor-quality pixels are sometimes observed. Additionally, an unresolved data striping issue is periodically present and observed as a narrow band of distorted pixels, which sometimes evades the land mask and, crosses images diagonally above Vancouver Island. Efforts are underway to correct this issue. Data users should consider these uncertainties and issues when using the data.

Satellite remote sensing is increasingly used to study surface ocean processes at the spatial and temporal resolutions required for understanding long term variability under a changing climate. Chlorophyll-a is the most widely used measure of phytoplankton biomass and crucial for understanding phytoplankton which are the base of the marine food web and control ocean biogeochemical cycling. Suspended particulate matter is a key water quality indicator (i.e. turbidity) with increased concentrations reducing light availability to aquatic species.

Funding was provided by the UBC/UVic Hakai Coastal Initiative postdoctoral fellowship, NSERC NCE Marine Environmental Observation Prediction and Response (MEOPAR) network, Canadian Space Agency (CSA), Canadian Foundation for Innovation (CFI) and NSERC Discover Grant awarded to Maycira Costa.

It is requested that Giannini et al. (2021), Jacoby et al. (2019) and Marchese et al. (2022) are referenced if data is used for published research and the ESA acknowledged as the data provider.
attribute NC_GLOBAL TileSize String 489:382
attribute NC_GLOBAL time_coverage_end String 2024-11-20T00:00:00Z
attribute NC_GLOBAL time_coverage_start String 2020-06-26T00:00:00Z
attribute NC_GLOBAL title String Daily satellite (Sentinel 3A and 3B) chlorophyll and suspended matter concentrations for coastal British Columbia and southeast Alaska
attribute NC_GLOBAL Westernmost_Easting double -139.0
dimension time   double nValues=557, evenlySpaced=false, averageSpacing=2 days 21h 24m 36s
attribute time _CoordinateAxisType String Time
attribute time actual_range double 1.5931296E9, 1.7320608E9
attribute time axis String T
attribute time ioos_category String Time
attribute time long_name String Time
attribute time standard_name String time
attribute time time_origin String 01-JAN-1970 00:00:00
attribute time units String seconds since 1970-01-01T00:00:00Z
dimension latitude   double nValues=7823, evenlySpaced=false, averageSpacing=0.0015976057464307707
attribute latitude _ChunkSizes uint 7823
attribute latitude _CoordinateAxisType String Lat
attribute latitude _FillValue double NaN
attribute latitude actual_range double 47.003527851418525, 59.500000000000014
attribute latitude axis String Y
attribute latitude ioos_category String Location
attribute latitude long_name String Latitude
attribute latitude standard_name String latitude
attribute latitude units String degrees_north
dimension longitude   double nValues=6493, evenlySpaced=true, averageSpacing=0.0026949458523585603
attribute longitude _ChunkSizes uint 6493
attribute longitude _CoordinateAxisType String Lon
attribute longitude _FillValue double NaN
attribute longitude actual_range double -139.0, -121.50441152648823
attribute longitude axis String X
attribute longitude ioos_category String Location
attribute longitude long_name String Longitude
attribute longitude standard_name String longitude
attribute longitude units String degrees_east
variable chl_conc   float time, latitude, longitude
attribute chl_conc _FillValue float 0.0
attribute chl_conc colorBarMaximum float 40.0
attribute chl_conc colorBarMinimum float 0.15
attribute chl_conc colorBarPalette String Spectrum
attribute chl_conc colorBarScale String Log
attribute chl_conc long_name String Chlorophyll-A Concentration
attribute chl_conc standard_name String mass_concentration_of_chlorophyll_a_in_sea_water
attribute chl_conc units String mg/m^3
attribute chl_conc valid_pixel_expression String chl_conc_count > 0
variable SPM   float time, latitude, longitude
attribute SPM _FillValue float 0.0
attribute SPM colorBarMaximum float 50.0
attribute SPM colorBarMinimum float 0.02
attribute SPM colorBarPalette String Spectrum
attribute SPM colorBarScale String Log
attribute SPM long_name String Suspended Particulate Matter
attribute SPM units String mg/m^3
attribute SPM valid_pixel_expression String SPM_count > 0
variable bitmask   float time, latitude, longitude
attribute bitmask _FillValue float 0.0
attribute bitmask long_name String bitmask
attribute bitmask valid_pixel_expression String bitmask_count > 0
variable bitmask_count   int time, latitude, longitude
attribute bitmask_count _FillValue int 0
attribute bitmask_count long_name String Count of bitmask

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.


 
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