Here is our material list when we have to sample. We already talked about the ‘cubis’ which are 9m2 platforms with 80cm freeboard from which we do all our sampling. Except microlayer and atmosphere exchange, the samples are taken along the 12m depth of the water column using a ‘sampler’. Actually it’s like a big syringe with a plunger moving as long as we go down to the mesocosm. Each run is 5 liters of water and most of the time we have to do 3 runs (‘cast’ in Mesocosms Vocabulary). Once the ‘sampler’ is back at the surface, one person of the team use the hook to bring the sampler on the side of the mesocosm and with a nice mouvement the sampler as to be on a box without touching the cubi (to avoid contamination). Not always easy because relatively heavy and even harder when there is swell or wind!!
Once the sampler is secured, we can start to pour the water from the ‘sampler’ to the multiple different sub-bottles. Some of them have to be rinsed other not; some need to be filled without bubbles (create air-water exchange which bias the analysis) … took us few sampling to find the best way to fulfill each of the parameters! For each mesocosm we have a box containing all the bottles. So, 1 box for the ‘sampler’; 3 boxes for the bottles to fill (4 for the team who is doing the outside sampling) and one kook: doesn’t leave lot of space for the 2 people on the cubis!