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Sentinel-3A continues to impress
by Staff Writers
Paris (ESA) Mar 14, 2016

This is one of the first images from Sentinel-3A's Sea and Land Surface Temperature Radiometer (SLSTR). Acquired with the instrument's visible channels on 3 March 2016 at 11:23 GMT, this false-colour image features the Spanish Canary Islands, the Portuguese island of Madeira and the northwest coast of Africa. The vegetated islands appear red in contrast to Western Sahara, which has little vegetation. The snow-capped peak of Mount Teide on the island of Tenerife is clearly visible. Both SLSTR and Sentinel-3's Ocean and Land Colour Instrument, OLCI, will be used to monitor plant health. As the SLSTR scans Earth's surface, it senses visible light and infrared light (heat) in a number of different spectral channels. The thermal infrared channels will soon be working when the instrument has finished outgassing water vapour. This is necessary because the infrared channels must be cooled to operate properly. The SLSTR will measure global sea- and land-surface temperatures every day to an accuracy of better than 0.3+ C. Image courtesy Copernicus data (2016). For a larger version of this image please go here.

The three instruments on the Sentinel-3A satellite are now offering a tantalising glimpse of what's in store for Europe's Copernicus environmental monitoring effort. The latest images, which feature Europe and Antarctica, come from the sensor that records Earth's radiant energy.

Launched just three weeks ago, Sentinel-3A carries a suite of cutting-edge instruments to provide systematic measurements of Earth's oceans, land, ice and atmosphere. This information will feed into numerous Copernicus services to monitor and manage our environment.

The satellite has already delivered impressive first images from its Ocean and Land Colour Instrument and its altimeter, and now the 'radiometer' has revealed its talents. The Sea and Land Surface Temperature Radiometer measures the energy radiating from Earth's surface in nine spectral bands, including visible and infrared.

In addition to providing the temperature of the land and sea surface, dedicated channels will search for fires. This will help to map carbon emissions from burnt biomass and to assess damage and estimate recovery of burned areas. The first images come from the visible channels because the thermal-infrared channels have yet to be activated.

One of the images features the Spanish Canary Islands, the Portuguese island of Madeira and the northwest coast of Africa. This false-colour image shows the vegetated islands in red, in contrast to Western Sahara, where there is little vegetation.

The snow-capped peak of Mount Teide on the island of Tenerife is also clearly visible in the image. Both the radiometer and the colour instrument will monitor plant health.

ESA's Sentinel-3 project manager, Bruno Berruti, said, "It is very exciting to see all three instruments working well. Of course, it is still early days but we are looking to exploiting their full potential and use them together.

"For example, combining radiometer and colour data will help us to understand the state of the vegetation better."

Another of the images from its visible channels shows a long crack running through the ice shelf to the east of the Antarctic Peninsula.

The crack is about 2 km wide, but widens to 4 km or more in some places. There are also finer cracks and structures visible in the ice shelf. Structure in the cloud, cloud shadows and details of the land emerging from the ice can also be seen.

An additional false-colour image, captured on 2 March, features a large part of Europe, demonstrating the instrument's 1400 km-wide swath. It also shows vegetated areas in red as well as storm Jake over the UK.

EUMETSAT ocean remote sensing scientist, Anne O'Carroll, said, "These first images are very exciting and show the potential of this innovative instrument, which is the most advanced of its kind and eagerly awaited by the ocean science community.

"What's new is that it records a double view of its path as it orbits Earth, which means that we get more accurate measurements of the temperature of the ocean surface. These measurements are crucial for operational weather and ocean forecasting, to follow climate cycles such as El Nino and to monitor changes in Earth's climate."

The thermal channels will be working in a few weeks but this latest Copernicus Sentinel has already impressed with its very first images, which will improve as operators spend the next five months fine-tuning and commissioning the satellite for operations.

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