A damaged oil tanker off the northwest coast of Spain split in half onTuesday (November 19, 2002), creating a series of large oil slicks. The tankerwas carrying more than 20 million gallons of oil, but it is unknown how much has spilled,and how much remains onboard the sunken ship. The ship was originally damaged (and startedleaking oil) on November 13. The oil has already washed up on some beaches, andthreatens a Portuguese nature preserve.
The image above shows the oil slick with data from the Canadian RADARSAT satellite.Black areas indicate the location of the slick on November 18. Oil slicks are visiblefrom RADARSAT because the oil smooths the ocean surface. Radar waves bounce off thesmooth surface and away from the satellite instrument. The surface of clean wateris rough, so some of the radar waves are scattered back towards the instrument. Therefore,clean water appears bright.
The Spanish coast is shown in color with Landsat data. The coastal town of A Coruña is located near the center of this image (on the point of land just above the 3-mile marker overlay).
References & Resources
RADARSAT data copyright Canadian Space Agency / Agence spatiale canadienne 2002. Processed and distributed by RADARSAT International, a subsidiary of MacDonald Dettwiler and Associates (TSX:MDA) Image by Stormcenter Communications
