Early Sentinel-3 image of coccolithophore between Scotland and Norway

Upsala Glacier in Argentina’s Los Glaciares National Park is pictured in this Sentinel-2A image from 22 January 2016. Taking a closer look at the terminus of the Upsala Glacier, we can see how icebergs have broken off and are floating in the water of the upper reaches of Lake Argentino. The lake’s unique colour is attributed to ‘glacier milk’ – suspended fine sediment produced by the abrasion of glaciers rubbing against rock.

The darker lines following the flow of the glacier are moraines: accumulations of rock, soil and other debris – including glacial milk – that have been deposited by the glacier.”

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Captured by Sentinel-3A on 23 June 2016, this image shows an algae bloom in the Baltic Sea. Sentinel-3A carries a suite of instruments to monitor our changing world. This image was captured with its ocean and land colour instrument, OLCI, which provides biogeochemical measurements to monitor, for example, concentrations of algae, suspended matter and chlorophyll in seawater. This information can be used to predict harmful algal blooms, which is particularly relevant in the Baltic Sea where extreme blooms are a significant problem. The health and vulnerability of marine ecosystems is fundamental to our knowledge of ocean productivity and, in turn, fish stocks. The coloured tracks in the image are temperature measurements from a zeppelin

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A colourful summer marine phytoplankton bloom fills much of the Baltic Sea in this image captured by Envisat’s MERIS on 13 July 2005.

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This image is a natural-colour capture of a plankton bloom in the Barents Sea by the Sentinel-2A satellite.

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Algae bloom in Lake Erie in 2011, taken by Envisat

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Image from Sentinel-2A taken on 7 August 2015 shows an algal bloom in the central Baltic Sea. The algae is concentrated in locations where the vertical and horizontal water movements in the Baltic Sea generate the best nutrient and light conditions for algal growth, which are then drawn out by the water circulation.

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This image of an algal bloom in the central Baltic Sea was captured by Sentinel-2A on 7 August 2015

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Sentinel-2A captured this detailed image of an algal bloom in the middle of the Baltic Sea on 7 August 2015. The image, which has a spatial resolution of 10 m, reveals the bloom in exquisite detail as well as a ship heading into the ‘eye of this algal storm’. The ship’s wake can be seen as a straight dark line where the bloom has been disturbed by the ship’s propellers.

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