Public release of Collection 3.0 Copernicus Sentinel-3 Near Real Time Aerosols

Copernicus Sentinel-3 Near Real Time (NRT) Aerosol Optical Depth (AOD) (550 nm) – Collection 3.0 – exclusively by EUMETSAT.

At EUMETSAT, we continuously evolve our satellite products: an iterative cycle of Science => Operational => Science => Operational… to enhance the quality.

Very happy to announce the public release of Collection 3.0 of the Copernicus Sentinel-3 Near Real Time (NRT) Aerosol product, operationally available from 3.11.2022 on-wards!

We have worked hard the last 12 months to address new developments expressed by some of our users, or identified from expert analyses on our side. Everything is described in our webpage & user product notice. Check out here.

Additional documentation (updated ATBD & Validation report) to be published very soon!

A major achievement is the design and implementation of a new classification – Naive Probabilistic – mask (cloud, snow, aerosol) to increase the coverage of aerosol events over oceans & as highlighted by our colleagues from the Copernicus Atmospheric Monitoring Service (CAMS).

Additional achievements are:
– the implementation of a Quality Indication (QI) ranking system per aerosol pixel.For example, previous animation show the best QI (= 3).
– the improvement in vegetation and bare soil modelling allowing a reduction of a bias over all land surfaces.

Check out all new maps, on EUMETSAT METIS website. And report us your feedback. We continue some evolution. Stay tuned for new works coming in the next quarters!

Overall, a joint work achieved internally at EUMETSAT, in partnership with Swansea University thanks to the Copernicus / EUMETSAT ACES project.

Big kudos to all EUMETSAT scientific, system engineers, and operator Colleagues for their involvement in this operational deployment! And great thanks to all experts who have listened to our ideas and give us feedback and endorsements such as the Sentinel-3 Sea and Land Surface Temperature (SLSTR) Quality Working Group (QWG), Sentinel-3 Validation Team (S3VT) Atmosphere, and CAMS!

Let’s continue our partnership!

More information:

  • Announcement of Collection 3.0 of Copernicus Sentinel-3 NRT Aerosols here
  • METIS platform – Live images of Copernicus Sentinel-3 NRT Aerosols here
  • The Copernicus program from the European Commission here
  • Sentinel-3 Atmosphere portfolio led by EUMETSAT here

Harmful air pollution from Western Europe fires in July 2022 – With Copernicus Sentinel-3

Fires in Western Europe, Spain, France (e.g. Gironde and La Teste De Buch) are not only dangerous for the immediate surrounding population. But their emission of fine particles aerosols is of high concern. These smoke pollution can spread over long distance & impact on human health.

Sentinel-3 NRT Aerosol Optical Depth (AOD) 550 nm from the operational Copernicus Sentinel-3 NRT processor OSSAR-CS3, led by EUMETSAT.

Here an illustration with Copernicus Sentinel-3 Near Real Time (NRT – i.e. < 3h) Aerosol product from the EUMETSAT OSSAR-CS3 processor.

All information at:

Public pictures available at #METIS:

Stay tuned for the coming Collection 3 this Fall 2022!

Western Europe ravaged by fires during July 2022 – With Copernicus Sentinel-3 NRT

Fires are hitting us in Western Europe, especially in Spain, Portugal, and France. This is a very concerning situation for all surrounding population. We provide in Near Real Time (NRT – i.e. < 3h) information to all operational users thanks to OFRaP-CS3, the reference Copernicus Sentinel-3 NRT Fires processor of EUMETSAT.

Fires over Western Europe – July 2022 – observed with OFRaP-CS3 – Collection 2.0, the reference Copernicus Sentinel-3 NRT Fire processor led by EUMETSAT.

More information:

Stay tuned for Collection 2.1 upgrade, scheduled this Fall!

Saharan dust across Mediterranean

These days, in April 2022. quite a high load of dust particles can be clearly observed in the Mediterranean basin. They are notably visible with Copernicus Sentinel-3, see example of pictures from the Level 2 (l2) Near Real Time (NRT) aerosol product (by EUMETSAT from the OSSAR-CS3 Processor v3.0 – Collection 2.0)

These aerosols mostly originate from Sahara and travel toward South Europe.

More information?

  • Webpage on aerosol particles here
  • Copernicus Sentinel-3 NRT aerosol product Collection 2 from OSSAR-CS3 Processor v3.0 by EUMETSAT here

Working from home, Year 2!

Here we go for a 2nd year working from home again with EUMETSAT and Copernicus Sentinel-3 !

Although we have some hopes for a better health situation during 2021, it is clear we will have to continue to face turbulent moments.

I wish you All a very happy new year. Good luck to everyone going back to work! Let’s hope for a smooth transition from virtual meetings towards more and more real human interaction!

More information on:

  • The European Meteorological Satellite Agency EUMETSAT here
  • The Sentinel-3 mission here
  • The European Copernicus program here

Clouds with Copernicus Sentinel-3 SLSTR over Amazonia

RGB picture from Copernicus Sentinel-3 SLSTR-A over Amazonia on 30.11.2020. SWIR (1.6 um) in Red, and Visible (675 & 550 nm) in Blue & Green. Credit Picture from the SNAP tool box ESA/Brockmann Consult.

There is not only one type of clouds, but many of them, with diverse properties leading to various ways to visualize them when looking at our satellite measurements. Here an example with the Copernicus Sentinel-3 (S3) A Sea & Land Surface Temperature Radiometer (SLSTR) over Amazonia.

The Red-Green-Blue (RGB) picture below, of 30.11.2020 over Amazonia, combines the ShortWave InfraRed (SWIR) 1.6 um and the visible (674 & 550 nm). Water clouds with small droplets largely reflect at all channels & appear white. Snow & ice clouds strongly absorbs SWIR & appear cyan.

What about their altitude?

SLSTR has a special channel at 1.3 um in which water vapor (H2O) so much absorbs that no signal at the top of the atmosphere may be measured. Unless clouds at a very high altitude are present, shielding then a large fraction of the H2O column in the atmosphere. Consequently, a bright signal spikes up and elevated clouds shine!

Radiance at 1.3 um from Copenicus Sentinel-3 SLSTR-A over Amazonia on 30.11.2020. Credit Picture from the SNAP tool box ESA/Brockmann Consult.

From the picture above, snow & ice clouds are primary the highest one! Anything else lower, such as surface and fractional low clouds, seems “invisible”. They cannot be “seen”.

Save the date – Next S3VT on 10-12 March 2020 at EUMETSAT, Germany

Save the date! The next Sentinel-3 Validation Team (S3VT) workshop will be held at EUMETSAT, in Darmstadt, Germany, from the 10th to the 12th of March, 2020! This is an important meeting, jointly chaired by EUMETSAT and ESA, for all scientists & users engaged with validation and evolution recommendations of current & upcoming products from the Copernicus Sentinel-3 mission. And it will be my pleasure to co-chair our 2nd S3VT Atmosphere session.

Anyone who wishes to be involved in the Sentinel-3 validation activities with a privileged access to early new information is very encouraged to submit a proposal to join the S3VT team here. Looking forward to fruitful exchanges on aerosols, fire, H2O, and clouds!



More information

  • The ESA EUMETSAT S3VT WebPage here
  • Information about the S3VT Atmosphere sub-group here
  • To submit a Valid project idea proposal and join the S3VT as new member here
  • The EUropean organization for the expoitation of METorological SATellites here
  • The European Space Agency ESA here
  • The Copernicus programme from the European Union (EU) here

Winter has come in Europe – UV dose estimated from space

No doubt winter has come in Europe! The Earth inclination has changed.

As observed last Winter with GOME-2 UltraViolet (UV) measurements, a big change in the effective UV irradiance reaching the Earth surface is also seen over the day between last July and nowadays.

Here below is an example with the estimated reduced Vitamine D production in our skin as a direct consequence. These pictures are from the ESA / KNMI Tropospheric Emission Monitoring Internet Service (TEMIS). Satellite UV dose is computed from the assimilated global O3 – ozone field at local solar noon, and with surface downwelling solar (SDS) radiation & cloud information measured by the Meteosat Second Generation (MSG) satellites led by the EUMETSAT agency.


More information

  • WebBlog on Vitamin D estimated from GOME-2 UV measurements here
  • Clear-sky UV index forecast from the Tropospheric Emission Monitoring Internet Service (TEMIS) here, Credit ESA / KNMI

How many truckloads for carrying a typical “boomerang” Saharan dust over the Atlantic?

Saharan dust outbreak often occurs across the Atlantic. Here, a big #aerosol plume was captured by  the Sentinel-3 Ocean & Land Colour Instrument (OLCI) from the  Copernicus programme led by the European Union (EU). A big fraction of it usually travels across-Atlantic and one may think it doesn’t come back to us…

Screenshot 2019-11-01 at 22.17.49.png
Red-Green-Blue (RGB) composite imaged from Sentinel-3 OLCI, 2019.11.01. Source:

But the forecast of Aerosol Optical Depth (AOD) for Friday 1st November 2019, computed by the Copernicus Atmospheric Service (CAMS) & depicted by the Windy on-line application, shows a striking dust “boomerang”-like pattern. After travelling a large distance, a heavy dust load eventually comes back to South Europe. Wind is a key factor explaining such aerosol long-range transport.

Screenshot 2019-11-01 at 22.23.47.png
AOD forecast for Friday 2019.11.01 at 11 am, computed by CAMS and illustrated by Windy. Source:,15.708,-55.020,3

My colleague, Dr. Antti Lipponen, researcher at the Finnish Meteorological Institue (FMI), evaluated this transport phenomenon in a fancy unit. “Based on NASA’s GEOS-FP analysis the area of the dust over the Atlantic Ocean is about 9.1 million km² and the mass of the dust about 2.6 million tons (2 600 000 000 kg). If a truck would carry 40 tons of dust it would make about 65 000 truckloads!!!

Screenshot 2019-11-03 at 14.50.10.png

More information?

  • Windy here
  • Copernicus Atmospheric Service (CAMS) here
  • Follow Anti Lipponen on Twitter here
  • Aerosol WebPage here

High fire risks in California

Fire risks are quite high these days in Southern California. And some fires have even already been observed  by the Sentinel-3 (S3) B satellite, from the European Copernicus programme. Here below are some Red-Green-Blue (RGB) pictures from the Level 1 (L1) measurements of the optical S3B sensors, disseminated by EUMETSAT: the Ocean and Land Colour Instrument (OLCI) and the oblique view of the Sea & Land Surface Temperature Radiometer (SLSTR). These images show smoke  aerosol particles spreading from North of Los Angeles over Pacific.

As illustrated by @weatherchannel, these areas are located in “Critical” fire danger zones.

Screenshot 2019-10-13 at 16.18.02.png


More information:

  • Aerosol WebPage here
  • The European Union (EU) Copernicus programme here
  • The European Meteorological & climate satellite (EUMETSAT )agency here
  • The Copernicus Sentinel-3 mission operated by EUMETSAT here
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