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ERDDAP > info > esa-cci-chla-monthly-v6-0

Title Sum-
Institution Dataset ID
 data       graph  M    Chlorophyll a concentration, ESA OC CCI - Monthly, 1997-present. v6.0    ?   F   I   M   background (external link) RSS Subscribe
Plymouth Marine L...  ?

The Dataset's Variables and Attributes

Row Type Variable Name Attribute Name Data Type Value
attribute NC_GLOBAL cdm_data_type String Grid
attribute NC_GLOBAL comment String See summary attribute
attribute NC_GLOBAL Conventions String CF-1.7, COARDS, ACDD-1.3
attribute NC_GLOBAL creation_date String Thu Jan 18 09:04:18 2024
attribute NC_GLOBAL creator_email String help at
attribute NC_GLOBAL creator_name String Plymouth Marine Laboratory
attribute NC_GLOBAL creator_url String (external link)
attribute NC_GLOBAL date_created String 2022-08-15T22:03:48Z
attribute NC_GLOBAL Easternmost_Easting double 359.97916666666663
attribute NC_GLOBAL geospatial_lat_max double 89.97916666666667
attribute NC_GLOBAL geospatial_lat_min double -89.97916666666666
attribute NC_GLOBAL geospatial_lat_resolution double 0.041666666666666664
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_max double 359.97916666666663
attribute NC_GLOBAL geospatial_lon_min double 0.020833333333314386
attribute NC_GLOBAL geospatial_lon_resolution double 0.041666666666666664
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL git_commit_hash String 27964270df6ae0b9bdd0af5672529dbebb4e7bd9
attribute NC_GLOBAL history String Thu Jan 18 08:21:00 2024: ncatted -O -a geospatial_lon_max,global,o,f,360.0
Thu Jan 18 08:21:00 2024: ncatted -O -a geospatial_lon_min,global,o,f,0.0
Thu Jan 18 08:21:00 2024: ncatted -O -a valid_max,lon,o,f,359.9792
Thu Jan 18 08:21:00 2024: ncatted -O -a valid_min,lon,o,f,0.02083
Thu Jan 18 08:20:41 2024: ncap2 -O -s where(lon<0) lon=lon+360
Thu Jan 18 08:20:20 2024: 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_412_bias, Rrs_443, Rrs_443_bias, Rrs_490, Rrs_490_bias, Rrs_510, Rrs_510_bias, Rrs_560, Rrs_560_bias, Rrs_665, Rrs_665_bias, adg_412, adg_412_bias, adg_443, adg_443_bias, adg_490, adg_490_bias, adg_510, adg_510_bias, adg_560, adg_560_bias, adg_665, adg_665_bias, aph_412, aph_412_bias, aph_443, aph_443_bias, aph_490, aph_490_bias, aph_510, aph_510_bias, aph_560, aph_560_bias, aph_665, aph_665_bias, atot_412, atot_443, atot_490, atot_510, atot_560, atot_665, bbp_412, bbp_443, bbp_490, bbp_510, bbp_560, bbp_665, chlor_a, chlor_a_log10_bias, kd_490, kd_490_bias, water_class1, water_class10, water_class11, water_class12, water_class13, water_class14, water_class2, water_class3, water_class4, water_class5, water_class6, water_class7, water_class8, water_class9 with --mean, Rrs_412_rmsd, Rrs_443_rmsd, Rrs_490_rmsd, Rrs_510_rmsd, Rrs_560_rmsd, Rrs_665_rmsd, adg_412_rmsd, adg_443_rmsd, adg_490_rmsd, adg_510_rmsd, adg_560_rmsd, adg_665_rmsd, aph_412_rmsd, aph_443_rmsd, aph_490_rmsd, aph_510_rmsd, aph_560_rmsd, aph_665_rmsd, chlor_a_log10_rmsd, kd_490_rmsd with --root-mean-square, and MERIS_nobs, MODISA_nobs, OLCI-A_nobs, OLCI-B_nobs, SeaWiFS_nobs, VIIRS_nobs, total_nobs - with --total
1705571341 Subsetted from standardised_geo/ to only include variables MERIS_nobs_sum,MODISA_nobs_sum,OLCI-A_nobs_sum,OLCI-B_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
attribute NC_GLOBAL id String
attribute NC_GLOBAL infoUrl String (external link)
attribute NC_GLOBAL institution String Plymouth Marine Laboratory
attribute NC_GLOBAL keywords String algorithms, aqua, area, array, array-data, bias, bin, blended, cci, cell, chemistry, chlor_a, chlor_a_log10_bias, chlor_a_log10_rmsd, chlorophyll, chlorophyll-a, class, color, colour, combination, comprehensive, concentration, contributing, count, 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, meris, MERIS_nobs_sum, moderate, modis, MODISA_nobs_sum, not, number, observation, observations, oc2, ocean, ocean color, ocean colour, oceans, oci, oci2, ocx, olci, OLCI-A_nobs_sum, OLCI-B_nobs_sum, plymouth, product, radiometer, resolution, root, root-mean-square-difference, satellite, science, sea, sea-wide, seawater, seawifs, SeaWiFS_nobs_sum, sensor, sentinel, sentinel-3a, sentinel-3b, spectroradiometer, square, statistics, stewardship, suite, system, time, total, total_nobs_sum, transformed, view, viirs, VIIRS_nobs_sum, visible, water, wide
attribute NC_GLOBAL keywords_vocabulary String GCMD Science Keywords
attribute NC_GLOBAL license String 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
attribute NC_GLOBAL naming_authority String
attribute NC_GLOBAL NCO String netCDF Operators version 4.7.5 (Homepage =, Code =
attribute NC_GLOBAL nco_openmp_thread_number int 1
attribute NC_GLOBAL netcdf_file_type String NETCDF4_CLASSIC
attribute NC_GLOBAL Northernmost_Northing double 89.97916666666667
attribute NC_GLOBAL number_of_bands_used_to_classify String 4
attribute NC_GLOBAL number_of_files_composited int 31
attribute NC_GLOBAL number_of_optical_water_types String 14
attribute NC_GLOBAL platform String Orbview-2,Aqua,Envisat,Suomi-NPP, Sentinel-3a, Sentinel-3b
attribute NC_GLOBAL processing_level String Level-3
attribute NC_GLOBAL product_version String 6.0
attribute NC_GLOBAL project String Climate Change Initiative - European Space Agency
attribute NC_GLOBAL references String (external link)
attribute NC_GLOBAL sensor String SeaWiFS,MODIS,MERIS,VIIRS,OLCI
attribute NC_GLOBAL sensors_present String OLCIa OLCIb
attribute NC_GLOBAL source String 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
attribute NC_GLOBAL sourceUrl String (local files)
attribute NC_GLOBAL Southernmost_Northing double -89.97916666666666
attribute NC_GLOBAL spatial_resolution String 4km nominal at equator
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v70
attribute NC_GLOBAL summary String 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 2012-2014; at the third stage Sentinel-3A OLCI was bias corrected against already corrected MODIS, for overlap period 2016-07-01 to 2019-06-30; at the fourth stage Sentinel-3B OLCI was bias corrected against already corrected Sentinel-3A OLCI, for overlap period 2018-07-01 to 2021-06-30. VIIRS, MODIS, SeaWiFS and MERIS Rrs were derived from a combination of NASA's l2gen (for basic sensor geometry corrections, etc) and HYGEOS POLYMER (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 algorithms through 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 according to Jackson et al. (in prep).
attribute NC_GLOBAL time_coverage_duration String P1M
attribute NC_GLOBAL time_coverage_end String 2023-12-01T00:00:00Z
attribute NC_GLOBAL time_coverage_resolution String P1M
attribute NC_GLOBAL time_coverage_start String 1997-09-04T00:00:00Z
attribute NC_GLOBAL title String Chlorophyll a concentration, ESA OC CCI - Monthly, 1997-present. v6.0
attribute NC_GLOBAL tracking_id String abd52a4c-7009-464f-b1eb-958f7d333a1d
attribute NC_GLOBAL Westernmost_Easting double 0.020833333333314386
dimension time   double nValues=316, evenlySpaced=false, averageSpacing=30 days 10h 12m 34s
attribute time _CoordinateAxisType String Time
attribute time actual_range double 8.733312E8, 1.7013888E9
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=4320, evenlySpaced=true, averageSpacing=-0.041666666666666664
attribute latitude _CoordinateAxisType String Lat
attribute latitude actual_range double -89.97916666666666, 89.97916666666667
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
attribute latitude valid_max double 89.97916666666667
attribute latitude valid_min double -89.97916666666666
dimension longitude   double nValues=8640, evenlySpaced=true, averageSpacing=0.041666666666666664
attribute longitude _CoordinateAxisType String Lon
attribute longitude actual_range double 0.020833333333314386, 359.97916666666663
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
attribute longitude valid_max double 359.97918701171875
attribute longitude valid_min double 0.020829999819397926
variable chlor_a   float time, latitude, longitude
attribute chlor_a _FillValue float NaN
attribute chlor_a ancillary_variables String chlor_a_log10_rmsd chlor_a_log10_bias
attribute chlor_a colorBarMaximum double 30.0
attribute chlor_a colorBarMinimum double 0.03
attribute chlor_a colorBarScale String Log
attribute chlor_a ioos_category String Ocean Color
attribute chlor_a long_name String 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
attribute chlor_a parameter_vocab_uri String (external link)
attribute chlor_a standard_name String mass_concentration_of_chlorophyll_a_in_sea_water
attribute chlor_a units String mg m-3
attribute chlor_a units_nonstandard String mg m^-3
variable MERIS_nobs_sum   float time, latitude, longitude
attribute MERIS_nobs_sum _FillValue float NaN
attribute MERIS_nobs_sum colorBarMaximum double 100.0
attribute MERIS_nobs_sum colorBarMinimum double 0.0
attribute MERIS_nobs_sum ioos_category String Statistics
attribute MERIS_nobs_sum long_name String Count of the number of observations from the MERIS sensor contributing to this bin cell
attribute MERIS_nobs_sum number_of_files_composited int 31
variable MODISA_nobs_sum   float time, latitude, longitude
attribute MODISA_nobs_sum _FillValue float NaN
attribute MODISA_nobs_sum colorBarMaximum double 100.0
attribute MODISA_nobs_sum colorBarMinimum double 0.0
attribute MODISA_nobs_sum ioos_category String Statistics
attribute MODISA_nobs_sum long_name String Count of the number of observations from the MODIS (Aqua) sensor contributing to this bin cell
attribute MODISA_nobs_sum number_of_files_composited int 31
variable OLCI_A_nobs_sum   float time, latitude, longitude
attribute OLCI_A_nobs_sum _FillValue float NaN
attribute OLCI_A_nobs_sum colorBarMaximum double 100.0
attribute OLCI_A_nobs_sum colorBarMinimum double 0.0
attribute OLCI_A_nobs_sum ioos_category String Statistics
attribute OLCI_A_nobs_sum long_name String Count of the number of observations from the OLCI (Sentinel-3a) sensor contributing to this bin cell
attribute OLCI_A_nobs_sum number_of_files_composited int 31
variable OLCI_B_nobs_sum   float time, latitude, longitude
attribute OLCI_B_nobs_sum _FillValue float NaN
attribute OLCI_B_nobs_sum colorBarMaximum double 100.0
attribute OLCI_B_nobs_sum colorBarMinimum double 0.0
attribute OLCI_B_nobs_sum ioos_category String Statistics
attribute OLCI_B_nobs_sum long_name String Count of the number of observations from the OLCI (Sentinel-3b) sensor contributing to this bin cell
attribute OLCI_B_nobs_sum number_of_files_composited int 31
variable SeaWiFS_nobs_sum   float time, latitude, longitude
attribute SeaWiFS_nobs_sum _FillValue float NaN
attribute SeaWiFS_nobs_sum colorBarMaximum double 100.0
attribute SeaWiFS_nobs_sum colorBarMinimum double 0.0
attribute SeaWiFS_nobs_sum ioos_category String Statistics
attribute SeaWiFS_nobs_sum long_name String Count of the number of observations from the SeaWiFS (GAC and LAC) sensor contributing to this bin cell
attribute SeaWiFS_nobs_sum number_of_files_composited int 31
variable VIIRS_nobs_sum   float time, latitude, longitude
attribute VIIRS_nobs_sum _FillValue float NaN
attribute VIIRS_nobs_sum colorBarMaximum double 100.0
attribute VIIRS_nobs_sum colorBarMinimum double 0.0
attribute VIIRS_nobs_sum ioos_category String Statistics
attribute VIIRS_nobs_sum long_name String Count of the number of observations from the VIIRS sensor contributing to this bin cell
attribute VIIRS_nobs_sum number_of_files_composited int 31
variable chlor_a_log10_bias   float time, latitude, longitude
attribute chlor_a_log10_bias _FillValue float NaN
attribute chlor_a_log10_bias colorBarMaximum double 0.1
attribute chlor_a_log10_bias colorBarMinimum double -0.1
attribute chlor_a_log10_bias comment String Uncertainty lookups derived from file: /data/datasets/CCI/v6.0-production/stage09b-uncertainty_tables/chlor_a/cci_chla_bias.dat
attribute chlor_a_log10_bias ioos_category String Statistics
attribute chlor_a_log10_bias long_name String Bias of log10-transformed chlorophyll-a concentration in seawater.
attribute chlor_a_log10_bias references String (external link)
attribute chlor_a_log10_bias rel String uncertainty
variable chlor_a_log10_rmsd   float time, latitude, longitude
attribute chlor_a_log10_rmsd _FillValue float NaN
attribute chlor_a_log10_rmsd colorBarMaximum double 0.002
attribute chlor_a_log10_rmsd colorBarMinimum double 0.0
attribute chlor_a_log10_rmsd comment String Uncertainty lookups derived from file: /data/datasets/CCI/v6.0-production/stage09b-uncertainty_tables/chlor_a/cci_chla_rmsd.dat
attribute chlor_a_log10_rmsd ioos_category String Statistics
attribute chlor_a_log10_rmsd long_name String Root-mean-square-difference of log10-transformed chlorophyll-a concentration in seawater.
attribute chlor_a_log10_rmsd references String (external link)
attribute chlor_a_log10_rmsd rel String uncertainty
variable total_nobs_sum   float time, latitude, longitude
attribute total_nobs_sum _FillValue float NaN
attribute total_nobs_sum colorBarMaximum double 100.0
attribute total_nobs_sum colorBarMinimum double 0.0
attribute total_nobs_sum ioos_category String Statistics
attribute total_nobs_sum long_name String Count of the total number of observations contributing to this bin cell
attribute total_nobs_sum number_of_files_composited int 31

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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