Sediment traps, the best part !!! (by Amélie)

Mesocosms are like iceberg, the big part is underwater, the bottom is around 14m of depth and at the bottom of the bag there are the famous sediment traps.

Underwater view of the meso

I am in charged of sediment traps, they need to be changed everyday! It’s the best part of the mission, every afternoon I go with Sylvain to replace the sediment traps (which consiste in a plastic bottle screwed on the sediment particules manifold). We are totally independent, we go under water from the station to the mesocosms using underwater scooter, it’s so cool!!! It’s very fast around 20 minutes to go, change the nine traps and come back.

Sylvain and Amélie leaving the harbor to change the sediment traps

Under water it’s so calm (even when very windy at the surface), everyday we are welcomed by a multitude of curious fish.

We found a lot of swimmers in sediment traps and sometimes jellyfish!

The plastic bottles which are changed every day.

A jellyfish in the sediment trap!!

The sediment traps collection is done to measure the export of organic and inorganic carbon and see if there are differences between treatments.

I would like to sincerely thank Sylvain who come with me everyday and Alex (the Sunday afternoons) as well as Stephen who took a really nice pictures of mesocosms.

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