Algae along South America seen from the Envisat satellite on
the 17, 18, 19 and 20 Februar 2007.
The satellite images show algae blooming in the ocean. The
red and yellow colors show high concentrations of algae (phytoplankton).
The blue and green colors show lower concentrations. The algae
are feed by nutrients that are forced from the bottom of the sea
to the ocean surface by the cold Humbolt Current that is active
along most of the South American coastline. The map covers more
than 2000 km.
Vædderen departed from Antofagasta on 13 February and sailed
north along the coastline of Chile and Peru. The green line
shows the past track. On 21 February Vædderen is south of Lima
in Peru. The expedition plan is to head further north along the
coast and then to Galapagos. The route is shown with a red line.
The algae maps consists of a mosaic of four satellite images
recorded by the MERIS instrument onboard the Envisat satellite
in the days 17, 18, 19 and 20 February 2007. Envisat belongs to
the European Space Agency, ESA. MERIS observes the reflected
sunlight in several channels (bands) and from these observations
the algae concentration is calculated using an algorithm.
The mosaic is downloaded by Risø – DTU from Google Earth at
Read more about algae seen from satellite at Satellite Eye
for Galathea 3 projektet ”Phytoplankton - seen from Space”