Dataset
ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global attenuation coefficient for downwelling irradiance (Kd490) gridded on a sinusoidal projection, Version 5.0
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 the Version 5.0 Kd490 attenuation coefficient (m-1) for downwelling irradiance product on a sinusoidal projection at approximately 4 km spatial resolution and at a number of time resolutions (daily, 5-day, 8-day and monthly composites) covering the period 1997 - 2020. It is computed from the Ocean Colour CCI Version 5.0 inherent optical properties dataset at 490 nm and the solar zenith angle. Note, these data are also contained within 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).
Please note, data from December 2020 onwards are affected by an anomaly discovered after production and resulting in a spurious jump in remote sensing reflectance. The anomaly has been corrected in the version 5.0.1 of the dataset available through the Copernicus Climate Change Service (https://doi.org/10.24381/cds.f85b319d)
Version 6.0 of this data is now also available here: https://doi.org/10.5285/5011d22aae5a4671b0cbc7d05c56c4f0
Details
| Previous Info: |
2023-08-08
Please note, data from December 2020 onwards are affected by an anomaly discovered after production and resulting in a spurious…
Show More
2023-08-08
Please note, data from December 2020 onwards are affected by an anomaly discovered after production and resulting in a spurious jump in remote sensing reflectance. The anomaly has been corrected in the version 5.0.1 of the dataset available through the Copernicus Climate Change Service (https://doi.org/10.24381/cds.f85b319d) 2021-05-19 This dataset forms part of the v5.0 ocean colour dataset collection that can be cited with the doi: 10.5285/1dbe7a109c0244aaad7… Show More 2021-05-19 This dataset forms part of the v5.0 ocean colour dataset collection that can be cited with the doi: 10.5285/1dbe7a109c0244aaad713e078fd3059a Show Less |
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| Previously used record identifiers: |
No related previous identifiers.
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| 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. |
| 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://climate.esa.int/en/projects/ocean-colour/)
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| File Format: |
Data are netCDF formatted.
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Process overview
| Title | Derivation of Ocean Colour v5 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. For more information see the Ocean Colour v5 Product User Guide. |
| Input Description | None |
| Output Description | None |
| Software Reference | None |
- units: m-1
- long_name: Bias of downwelling attenuation coefficient at 490 nm derived using Lee 2005 equation and bbw from Zhang 2009
- var_id: kd_490_bias
- names: Bias of downwelling attenuation coefficient at 490 nm derived using Lee 2005 equation and bbw from Zhang 2009
- long_name: Count of the number of observations from the MERIS sensor contributing to this bin cell
- var_id: MERIS_nobs_sum
- 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
- long_name: Count of the number of observations from the OLCI sensor contributing to this bin cell
- var_id: OLCI_nobs_sum
- names: Count of the number of observations from the OLCI 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
- long_name: Count of the number of observations from the VIIRS sensor contributing to this bin cell
- var_id: VIIRS_nobs_sum
- names: Count of the number of observations from the VIIRS sensor contributing to this bin cell
- long_name: Count of the total number of observations contributing to this bin cell
- var_id: total_nobs_sum
- names: Count of the total number of observations contributing to this bin cell
- units: m-1
- long_name: Downwelling attenuation coefficient at 490nm, derived using Lee 2005 equation and bbw from Zhang 2009 (following the SeaDAS Kd_lee algorithm)
- standard_name: volume_attenuation_coefficient_of_downwelling_radiative_flux_in_sea_water
- var_id: kd_490
- names: Downwelling attenuation coefficient at 490nm, derived using Lee 2005 equation and bbw from Zhang 2009 (following the SeaDAS Kd_lee algorithm), volume_attenuation_coefficient_of_downwelling_radiative_flux_in_sea_water
- units: m-1
- long_name: Root-mean-square-difference of downwelling attenuation coefficient at 490 nm derived using Lee 2005 equation and bbw from Zhang 2009
- var_id: kd_490_rmsd
- names: Root-mean-square-difference of downwelling attenuation coefficient at 490 nm derived using Lee 2005 equation and bbw from Zhang 2009
- var_id: crs
Co-ordinate Variables
- units: degrees_north
- standard_name: latitude
- var_id: lat
- names: latitude
- units: degrees_east
- standard_name: longitude
- var_id: lon
- names: longitude
- standard_name: time
- var_id: time
- names: time
Temporal Range
1997-09-04T00:00:00
2020-12-31T23:59:59
Geographic Extent
90.0000° |
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-180.0000° |
180.0000° |
|
-90.0000° |