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Dataset Title:  ZZZ - DEPRECATED - Chlorophyll a concentration, ESA OC CCI - Cumulative Mean,
2021. v5.0
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Institution:  Plymouth Marine Laboratory   (Dataset ID: esa-cci-chla-2021-clim-v5-0)
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Make a graph
Dimensions ? Start ? Stride ? Stop ?  Size ?    Spacing ?
 time (UTC) ?      1    (just one value)
  < slider >
 latitude (degrees_north) ?      4320    -0.04166667 (even)
  < slider >
 longitude (degrees_east) ?      8640    0.04166667 (even)
  < slider >
Grid Variables (which always also download all of the dimension variables) 
 chlor_a (mg m-3) ?
 chlor_a_log10_bias (Bias of log10-transformed chlorophyll-a concentration in seawater.) ?
 chlor_a_log10_rmsd ?

File type: (more information)

(Documentation / Bypass this form) ?
(Please be patient. It may take a while to get the data.)


The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.6094592e+9, 1.6094592e+9;
    String axis "T";
    String ioos_category "Time";
    String long_name "Time";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range -89.97916666666666, 89.97916666666667;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
    Float64 valid_max 89.97916666666667;
    Float64 valid_min -89.97916666666666;
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range 0.020833333333314386, 359.97916666666663;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
    Float64 valid_max 359.97918701171875;
    Float64 valid_min 0.020829999819397926;
  chlor_a {
    Float32 _FillValue NaN;
    String ancillary_variables "chlor_a_log10_rmsd chlor_a_log10_bias";
    Float64 colorBarMaximum 30.0;
    Float64 colorBarMinimum 0.03;
    String colorBarScale "Log";
    String ioos_category "Ocean Color";
    String long_name "Chlorophyll-a concentration in seawater (not log-transformed), generated by as a blended combination of OCI, OCI2, OC2 and OCx algorithms, depending on water class memberships";
    String parameter_vocab_uri "";
    String standard_name "mass_concentration_of_chlorophyll_a_in_sea_water";
    String units "mg m-3";
    String units_nonstandard "mg m^-3";
  chlor_a_log10_bias {
    Float32 _FillValue NaN;
    Float64 colorBarMaximum 0.1;
    Float64 colorBarMinimum -0.1;
    String comment "Uncertainty lookups derived from file: /data/datasets/CCI/v5.0-production/stage09b-uncertainty_tables/chlor_a/cci_chla_bias.dat";
    String ioos_category "Statistics";
    String long_name "Bias of log10-transformed chlorophyll-a concentration in seawater.";
    String references "";
    String rel "uncertainty";
  chlor_a_log10_rmsd {
    Float32 _FillValue NaN;
    Float64 colorBarMaximum 0.002;
    Float64 colorBarMinimum 0.0;
    String comment "Uncertainty lookups derived from file: /data/datasets/CCI/v5.0-production/stage09b-uncertainty_tables/chlor_a/cci_chla_rmsd.dat";
    String ioos_category "Statistics";
    String long_name "Root-mean-square-difference of log10-transformed chlorophyll-a concentration in seawater.";
    String references "";
    String rel "uncertainty";
    String cdm_data_type "Grid";
    String comment "See summary attribute";
    String Conventions "CF-1.7, COARDS, ACDD-1.3";
    String creation_date "Thu Jun 17 19:49:46 2021";
    String creator_email "";
    String creator_name "Plymouth Marine Laboratory";
    String creator_url "";
    String date_created "2021-06-17T19:49:46Z";
    Float64 Easternmost_Easting 359.97916666666663;
    Float64 geospatial_lat_max 89.97916666666667;
    Float64 geospatial_lat_min -89.97916666666666;
    Float64 geospatial_lat_resolution 0.041666666666666664;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 359.97916666666663;
    Float64 geospatial_lon_min 0.020833333333314386;
    Float64 geospatial_lon_resolution 0.041666666666666664;
    String geospatial_lon_units "degrees_east";
    String git_commit_hash "8c047ecb342fb95471e8f15bd80bd7f345ce53be";
    Int32 grid_mapping__ChunkSizes 1;
    String grid_mapping_name "latitude_longitude";
    String history 
"Wed Mar  9 10:54:15 2022: ncea -v chlor_a /mnt/r01/data/esa-cci_chla/v5.0/monthly/ /mnt/r01/data/esa-cci_chla/v5.0/monthly/ /mnt/r01/data/esa-cci_chla/v5.0/monthly/ /mnt/r01/data/esa-cci_chla/v5.0/monthly/ /mnt/r01/data/esa-cci_chla/v5.0/monthly/ /mnt/r01/data/esa-cci_chla/v5.0/monthly/ /mnt/r01/data/esa-cci_chla/v5.0/monthly/ /mnt/r01/data/esa-cci_chla/v5.0/monthly/ /mnt/r01/data/esa-cci_chla/v5.0/monthly/ /mnt/r01/data/esa-cci_chla/v5.0/monthly/ /mnt/r01/data/esa-cci_chla/v5.0/monthly/ /mnt/r01/data/esa-cci_chla/v5.0/monthly/
Thu Feb  3 08:08:41 2022: ncatted -O -a geospatial_lon_max,global,o,f,360.0
Thu Feb  3 08:08:41 2022: ncatted -O -a geospatial_lon_min,global,o,f,0.0
Thu Feb  3 08:08:41 2022: ncatted -O -a valid_max,lon,o,f,359.9792
Thu Feb  3 08:08:41 2022: ncatted -O -a valid_min,lon,o,f,0.02083
Thu Feb  3 08:08:21 2022: ncap2 -O -s where(lon<0) lon=lon+360
Thu Feb  3 08:08:01 2022: ncks -O --msa_usr_rdr -d lon,0.0,180.0 -d lon,-180.0,0.0
Source data were:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,; netcdf_compositor_cci composites  Rrs_412, Rrs_443, Rrs_490, Rrs_510, Rrs_560, Rrs_665, water_class1, water_class2, water_class3, water_class4, water_class5, water_class6, water_class7, water_class8, water_class9, water_class10, water_class11, water_class12, water_class13, water_class14, atot_412, atot_443, atot_490, atot_510, atot_560, atot_665, aph_412, aph_443, aph_490, aph_510, aph_560, aph_665, adg_412, adg_443, adg_490, adg_510, adg_560, adg_665, bbp_412, bbp_443, bbp_490, bbp_510, bbp_560, bbp_665, chlor_a, kd_490, Rrs_412_bias, Rrs_443_bias, Rrs_490_bias, Rrs_510_bias, Rrs_560_bias, Rrs_665_bias, chlor_a_log10_bias, aph_412_bias, aph_443_bias, aph_490_bias, aph_510_bias, aph_560_bias, aph_665_bias, adg_412_bias, adg_443_bias, adg_490_bias, adg_510_bias, adg_560_bias, adg_665_bias, kd_490_bias with --mean,  Rrs_412_rmsd, Rrs_443_rmsd, Rrs_490_rmsd, Rrs_510_rmsd, Rrs_560_rmsd, Rrs_665_rmsd, chlor_a_log10_rmsd, aph_412_rmsd, aph_443_rmsd, aph_490_rmsd, aph_510_rmsd, aph_560_rmsd, aph_665_rmsd, adg_412_rmsd, adg_443_rmsd, adg_490_rmsd, adg_510_rmsd, adg_560_rmsd, adg_665_rmsd, kd_490_rmsd with --root-mean-square, and  MODISA_nobs, VIIRS_nobs, OLCI_nobs, MERIS_nobs, SeaWiFS_nobs, total_nobs - with --total
1623958446 Subsetted from standardised_geo/ to only include variables MERIS_nobs_sum,MODISA_nobs_sum,OLCI_nobs_sum,SeaWiFS_nobs_sum,VIIRS_nobs_sum,chlor_a,chlor_a_log10_bias,chlor_a_log10_rmsd,crs,lat,lon,time,total_nobs_sum
2024-04-24T15:45:52Z (local files)
    String id "";
    String infoUrl "";
    String institution "Plymouth Marine Laboratory";
    String keywords "algorithms, area, array, array-data, bias, blended, cci, chemistry, chlor_a, chlor_a_log10_bias, chlor_a_log10_rmsd, chlorophyll, chlorophyll-a, class, color, colour, combination, comprehensive, concentration, coverage, data, depending, difference, earth, Earth Science > Oceans > Ocean Chemistry > Chlorophyll, esa, field, field-of-view, gac, generated, global, imager, imager/radiometer, imaging, infrared, laboratory, lac, large, local, log, log-transformed, log10, log10-transformed, marine, mass, mass_concentration_of_chlorophyll_a_in_sea_water, mean, memberships, moderate, modis, not, observation, oc2, ocean, ocean color, ocean colour, oceans, oci, oci2, ocx, plymouth, product, radiometer, resolution, root, root-mean-square-difference, satellite, science, sea, sea-wide, seawater, seawifs, sensor, spectroradiometer, square, statistics, stewardship, suite, system, time, transformed, view, viirs, visible, water, wide";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "ESA CCI Data Policy: free and open access.  When referencing, please use: Ocean Colour Climate Change Initiative dataset, Version <Version Number>, European Space Agency, available online at  We would also appreciate being notified of publications so that we can list them on the project website at";
    String naming_authority "";
    String NCO "netCDF Operators version 4.7.5 (Homepage =, Code =";
    Int32 nco_openmp_thread_number 1;
    String netcdf_file_type "NETCDF4_CLASSIC";
    Float64 Northernmost_Northing 89.97916666666667;
    String number_of_bands_used_to_classify "4";
    Int32 number_of_files_composited 31;
    String number_of_optical_water_types "14";
    String platform "Orbview-2,Aqua,Envisat,Suomi-NPP, Sentinel-3a";
    String processing_level "Level-3";
    String product_version "5.0";
    String project "Climate Change Initiative - European Space Agency";
    String references "";
    String sensor "SeaWiFS,MODIS,MERIS,VIIRS,OLCI";
    String sensors_present "MODISA OLCIa VIIRSN";
    String source "NASA SeaWiFS  L1A and L2 R2018.0 LAC and GAC, MODIS-Aqua L1A and L2 R2018.0, MERIS L1B 3rd reprocessing inc OCL corrections, NASA VIIRS L1A and L2 R2018.0, OLCI L1B";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -89.97916666666666;
    String spatial_resolution "4km nominal at equator";
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "Data products generated by the Ocean Colour component of the European Space Agency Climate Change Initiative project. These files are monthly composites of merged sensor (MERIS, Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua, Sea-Wide Field-of-View Sensor (SeaWiFS) Local Area Coverage (LAC) & Global Area Coverage (GAC), Visible and Infrared Imager/Radiometer Suite (VIIRS), OLCI) products.  MODIS Aqua and SeaWiFS were band-shifted and bias-corrected to MERIS bands and values using a temporally and spatially varying scheme based on the overlap years of 2003-2007.  VIIRS was band-shifted and bias-corrected in a second stage against the MODIS Rrs that had already been corrected to MERIS levels, for the overlap period 2012-2013; and at the third stage OLCI was bias corrected against already corrected MODIS, for overlap period 2016-07-01 to 2019-06-30.  VIIRS, MODIS, SeaWiFS and MERIS Rrs were derived from a combination of NASA's l2gen (for basic sensor geometry corrections, etc) and HYGEOS Polymer v4.12 (for atmospheric correction). OLCI Rrs were sourced at L1b (already geometrically corrected) and processed with polymer.  The Rrs were binned to a sinusoidal 4km level-3 grid, and later to 4km geographic projection, by Brockmann Consult's SNAP.  Derived products were generally computed with the standard algorithmsthrough SeaDAS.  QAA IOPs were derived using the standard SeaDAS algorithm but with a modified backscattering table to match that used in the bandshifting.  The final chlorophyll is a combination of OCI, OCI2, OC2 and OCx, depending on the water class memberships.  Uncertainty estimates were added using the fuzzy water classifier and uncertainty estimation algorithm of Tim Moore as documented in Jackson et al (2017). and updated accorsing to Jackson et al. (in prep).";
    String time_coverage_duration "P1M";
    String time_coverage_end "2021-01-01T00:00:00Z";
    String time_coverage_resolution "P1M";
    String time_coverage_start "2021-01-01T00:00:00Z";
    String title "ZZZ - DEPRECATED - Chlorophyll a concentration, ESA OC CCI - Cumulative Mean, 2021. v5.0";
    String tracking_id "112e35b8-1e36-48d1-9ee9-f0068446acac";
    Float64 Westernmost_Easting 0.020833333333314386;


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