1. APPLICATIONS Investigate the « particulate biomass » distribution along a size continuum and its variability in relation with W/E gradient or with different trophic regimes. Significance of the diurnal variations for all the particles. Optics applications : to document relationships between the slope of the size distribution and the particle attenuation spectra. c p ( ) =  - 

2. Hiac PVM ESD (µm) Density ESD (µm) Density Hiac Coulter

3. PROSOPE

4. PROSOPE (MIO, 15m)

5. Spearman Correlation Pomme 1 -0.900 -0.750 -0.600 -0.450 -0.300 -0.150 0.000 0.150 0.300 0.450 0.600 0.750 0.900 -20-19-18-17 39.5 40.5 41.5 42.5 43.5 l o n g i t u d e ( ° N ) latitude (°W) -5.3 -5.15 -5 -4.85 -4.7 -4.55 -4.4 -4.25 -4.1 -3.95 -3.8 -3.65 Slope -20.5-19.5-18.5-17.5 3 9 4 0 41 42 43 44 l o n g i t u d e ( ° N ) latitude (°W) Geopotential anomalies

6. Measurements Continuous size distribution from 1 to 1000 µm by using complementary devices: –Coulter Counter (<1 – 10 µm) discrete samples (rosette), manual process (50 ml) –Hiac Counter (5 – 100 µm) discrete (rosette) & continuous sampling, automated (300 ml) –PVM (100 – 1000 µm) continuous sampling vertical profiler