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Dataset

 
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ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global chlorophyll-a data products gridded on a sinusoidal projection, Version 4.2

Update Frequency: As Needed
Status: Completed
Online Status: ONLINE
Publication State: Published
Publication Date: 2020-07-01
Download Stats: last 12 months

Abstract

The ESA Ocean Colour CCI project has produced global level 3 binned multi-sensor time-series of satellite ocean-colour data with a particular focus for use in climate studies.

This dataset contains their Version 4.2 chlorophyll-a product (in mg/m3) on a sinusoidal projection at 4 km spatial resolution and at a number of time resolutions (daily, 5-day, 8-day and monthly composites). Note, the chlorophyll-a data are also included in the 'All Products' dataset.

This data product is on a sinusoidal equal-area grid projection, matching the NASA standard level 3 binned projection. The default number of latitude rows is 4320, which results in a vertical bin cell size of approximately 4 km. The number of longitude columns varies according to the latitude, which permits the equal area property. Unlike the NASA format, where the bin cells that do not contain any data are omitted, the CCI format retains all cells and simply marks empty cells with a NetCDF fill value. (A separate dataset is also available for data on a geographic projection.)

Citable as:  Sathyendranath, S.; Jackson, T.; Brockmann, C.; Brotas, V.; Calton, B.; Chuprin, A.; Clements, O.; Cipollini, P.; Danne, O.; Dingle, J.; Donlon, C.; Grant, M.; Groom, S.; Krasemann, H.; Lavender, S.; Mazeran, C.; Mélin, F.; Moore, T.S.; Müller, D.; Regner, P.; Steinmetz, F.; Steele, C.; Swinton, J.; Valente, A.; Zühlke, M.; Feldman, G.; Franz, B.; Frouin, R.; Werdell, J.; Platt, T. (2020): ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global chlorophyll-a data products gridded on a sinusoidal projection, Version 4.2. Centre for Environmental Data Analysis, date of citation. https://catalogue.ceda.ac.uk/uuid/99348189bd33459cbd597a58c30d8d10
Abbreviation: Not defined
Keywords: ESA, CCI, Ocean Colour, Sinusoidal, chlorophyll-a

Details

Previous Info:
No news update for this record
Previously used record identifiers:
No related previous identifiers.
Access rules:
Public data: access to these data is available to both registered and non-registered users.
Use of these data is covered by the following licence: http://licences.ceda.ac.uk/image/data_access_condition/esacci_oc_terms_and_conditions.pdf. When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

These data were produced by the ESA Ocean Colour CCI project and provided to CEDA in the context of the ESA CCI Open Data Portal project.
This dataset forms part of the v4.0 ocean colour dataset collection that can be cited with the following doi: to be added

Data Quality:
Data are as provided by the Ocean Colour CCI team. For details of validation see the linked Product User Guide and documentation on the Ocean Colour CCI website (https://esa-oceancolour-cci.org/)
File Format:
Data are netCDF formatted.

Process overview

This dataset was generated by the computation detailed below.
Title Derivation of Ocean Colour v4 data from the ESA Climate Change Initiative Ocean Colour project (Ocean_Colour_cci)
Abstract The ocean colour CCI has calculated ocean colour Essential Climate Variable data, using input data from various satellite instruments, as part of the ESA Climate Change Initiative program. The v4 dataset has been created by band-shifting and bias-correcting MERIS, MODIS and VIIRS data to match SeaWiFS data, merging the datasets and computing per-pixel uncertainty estimates. For more information see the Ocean Colour v4 Product User Guide.
Input Description None
Output Description None
Software Reference None
  • long_name: Bias of log10-transformed chlorophyll-a concentration in seawater.
  • var_id: chlor_a_log10_bias
  • names: Bias of log10-transformed chlorophyll-a concentration in seawater.
  • var_id: chlor_a
  • long_name: Chlorophyll-a concentration in seawater (not log-transformed), generated by SeaDAS using a blended combination of OCI (OC4v6 + Hu's CI), OC3 and OC5, depending on water class memberships
  • units: milligram m-3
  • standard_name: mass_concentration_of_chlorophyll_a_in_sea_water
  • names: mass_concentration_of_chlorophyll_a_in_sea_water, Chlorophyll-a concentration in seawater (not log-transformed), generated by SeaDAS using a blended combination of OCI (OC4v6 + Hu's CI), OC3 and OC5, depending on water class memberships
  • var_id: MERIS_nobs_sum
  • long_name: Count of the number of observations from the MERIS sensor contributing to this bin cell
  • names: Count of the number of observations from the MERIS sensor contributing to this bin cell
  • var_id: MODISA_nobs_sum
  • long_name: Count of the number of observations from the MODIS (Aqua) sensor contributing to this bin cell
  • names: Count of the number of observations from the MODIS (Aqua) sensor contributing to this bin cell
  • var_id: SeaWiFS_nobs_sum
  • long_name: Count of the number of observations from the SeaWiFS (GAC and LAC) sensor contributing to this bin cell
  • names: Count of the number of observations from the SeaWiFS (GAC and LAC) sensor contributing to this bin cell
  • var_id: VIIRS_nobs_sum
  • long_name: Count of the number of observations from the VIIRS sensor contributing to this bin cell
  • names: Count of the number of observations from the VIIRS sensor contributing to this bin cell
  • var_id: total_nobs_sum
  • long_name: Count of the total number of observations contributing to this bin cell
  • names: Count of the total number of observations contributing to this bin cell
  • long_name: Root-mean-square-difference of log10-transformed chlorophyll-a concentration in seawater.
  • var_id: chlor_a_log10_rmsd
  • names: Root-mean-square-difference of log10-transformed chlorophyll-a concentration in seawater.
  • var_id: crs

Co-ordinate Variables

  • standard_name: latitude
  • var_id: lat
  • units: degrees_north
  • names: latitude
  • var_id: lon
  • units: degrees_east
  • standard_name: longitude
  • names: longitude
  • standard_name: time
  • var_id: time
  • names: time