Global Ocean Colour: Bio-Geo-Chemical, L4, from Satellite Observations, Transparency, OLCI, 4KM

Dataset Availability

2023-04-01T00:00:00Z–2025-06-01T00:00:00Z

Dataset Provider

Copernicus

Earth Engine Snippet

ee.ImageCollection("COPERNICUS/MARINE/OC_GLO_BGC/TRANSPARENCY_OLCI_4KM")

Cadence

1 Month

Tags

copernicus marine oceans

Description

The Global Ocean Colour (Copernicus-GlobColour) dataset is a Bio-Geo-Chemical (BGC) product developed by ACRI-ST. Derived from multiple satellite sources like SeaWiFS, MODIS, and OLCI. It provides a comprehensive range of oceanographic variables, including: Chlorophyll (CHL), Phytoplankton Functional types and sizes (PFT), Primary Production (PP), Suspended Matter (SPM), Secchi Transparency Depth (ZSD), Diffuse Attenuation (KD490), Particulate Backscattering (BBP), Absorption Coefficient (CDM), Reflectance (RRS) and more.

This dataset provides global-scale data on ocean transparency. Its primary layer is the Diffuse Attenuation Coefficient at 490nm (KD490)), a key indicator of water clarity. Higher KD490values signify lower transparency due to the rapid absorption of blue-green light by constituents like phytoplankton or sediments. This L4 dataset, derived from the Ocean and Land Colour Instrument (OLCI), is a valuable resource for monitoring marine bio-geochemical processes and assessing water quality.

Documentation:

• User's Guide

• Quality Information Document

• Copernicus Marine Datastore

Bands

Pixel Size
4000 meters

Bands

Name	Units	Pixel Size	Description
KD490	1/m	meters	Diffuse attenuation coefficient at 490 nm
KD490_uncertainty	%	meters	Diffuse attenuation coefficient at 490 nm - The uncertainty as measured in hundredths of a percent (e.g., a value of 5000 means 50%).
flags		meters	Land water mask bit. 0: Water 1: Land

Terms of Use

Terms of Use

This dataset is released for use under Service Level Agreement (SLA), using the acronym "CMEMS" or the shortened name "Copernicus Marine Service" both denote the E.U. Copernicus Marine Environment Monitoring Service. Highlights and key features of the licence are provided in this document License

Citations

Citations:

• Copernicus Global Ocean Colour: Global Ocean Satellite Observations, ACRI-ST company (Sophia Antipolis, France) is providing Bio-Geo-Chemical (BGC) products based on the Copernicus-GlobColour processor. doi:10.48670/moi-00279

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Code Editor (JavaScript)

var dataset =
    ee.ImageCollection('COPERNICUS/MARINE/OC_GLO_BGC/TRANSPARENCY_OLCI_4KM')
        .filter(ee.Filter.date('2025-03-01', '2025-06-01'));

var KD490 = dataset.select('KD490');
var vis = {
  min: 0.021,
  max: 0.212,
  palette:
      ['D7F9D0', '91CA85', '5AB05D', '129450', '0F7347', '195437', '122414'],
};
Map.setCenter(71, 52, 2);
Map.addLayer(KD490, vis, 'KD490');

Open in Code Editor

Global Ocean Colour: Bio-Geo-Chemical, L4, from Satellite Observations, Transparency, OLCI, 4KM

The Global Ocean Colour (Copernicus-GlobColour) dataset is a Bio-Geo-Chemical (BGC) product developed by ACRI-ST. Derived from multiple satellite sources like SeaWiFS, MODIS, and OLCI. It provides a comprehensive range of oceanographic variables, including: Chlorophyll (CHL), Phytoplankton Functional types and sizes (PFT), Primary Production (PP), Suspended Matter (SPM), Secchi Transparency Depth …

COPERNICUS/MARINE/OC_GLO_BGC/TRANSPARENCY_OLCI_4KM, copernicus,marine,oceans

2023-04-01T00:00:00Z/2025-06-01T00:00:00Z

-90 -180 90 180

Google Earth Engine

https://developers.google.com/earth-engine/datasets