Harmfull algal bloom // Efflorescence


Partners: Hélène Hégaret (Laboratory of Marine Environmental Sciences - LEMAR)
DEAR 2050 Exhibition - Climanosco - Zurich, December 21 - January 22

The acidification of the ocean has reached an unprecedented level, these biochemical changes have impacts on ecosystems and on climate change.  The proliferation of toxic algae during episodes of "bloom" or "efflorescence" depends on acidity, pollutants (nitrates, phosphates, etc.), exposure to light, temperature, salinity … These months of March and April 2021, episodes of massive bloom are taking place in Chile and California.

In Chile the purple water kills millions of animals from hypoxia, while in California the red tide produces bio-luminescent waves at night. These phenomena are caused by variables such as water heating, upwelling (sediment rising to the surface), currents, nitrogenous discharges (nitrate, ammonia, nitrogen) linked to human activities. In 2021, it is the La Niña phenomenon that causes the upwelling phenomenon that allows the emergence of these breathtaking blooms.

These courts  excerpts from video works show a stimulation of the bloom in the laboratory by different types of waves and the generation of geometric light effects and shapes.

New work will be presented shortly.


These videos are produced thanks to the research laboratory of ecophysiologist and biologist Hélène Hegaret, a specialist in toxic algae blooms.