Published 29 Sep 2010
Last modified 03 Sep 2015, 02:38 PM
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Ship ice roads and changing ice cover - Gulf of Bothnia, Baltic Sea
This image shows the northern part of the Baltic Sea over time, This image was created by
combining three Envisat Advanced Synthetic Aperture Radar (ASAR) acquisitions taken over the
same area. The colours in the image result from variations in the surface. Radar backscatter from
sea ice is dependent on the dielectric properties and spatial distribution of the ice. Such factors as
ice age, surface roughness, internal geometry, temperature, and snow cover will also all play a
role in the affect of radar backscatter, Water just starts to freeze in the December acquisition, the
end of February shows an extended ice cover (redand blue) and some ship ice roads close to the
coast, connecting Oulunsalo to 1-lailuoto Island and Tornio. Early May shows the ice cover has
withdrawn significantly (yellowish edge).
acquired on 14 December 2008, 22 February 2009 and 3 May 2009 by Envisat/AS4R, ©ESA
For references, please go to www.eea.europa.eu/soer or scan the QR code.
This briefing is part of the EEA's report The European Environment - State and Outlook 2015. The EEA is an official agency of the EU, tasked with providing information on Europe’s environment.
PDF generated on 04 May 2016, 03:02 PM