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PICODIV RED SEA ANALYSIS Some details of the area: i) continental shelf: 10 m from shore the seafloor drops sharply at station A the depth is 700 m. Can.

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Presentation on theme: "PICODIV RED SEA ANALYSIS Some details of the area: i) continental shelf: 10 m from shore the seafloor drops sharply at station A the depth is 700 m. Can."— Presentation transcript:

1 PICODIV RED SEA ANALYSIS Some details of the area: i) continental shelf: 10 m from shore the seafloor drops sharply at station A the depth is 700 m. Can get to 1800 m further south. ii) CTD rig allows 12 x 12 litre bottle collection; light sensor, CTD and in situ fluorescence available. During September (proposed sampling time): Towards the end of the stratification period salinity > 40  /oo Oligotrophic waters due to the climatic conditions: Dry desert wind causes evaporation of 1cm day -1. & gives rise to a surface current from entrance of Red Sea to Aqaba Gulf of Aden in the south is nutrient rich & further north surface waters become depleted of nutrients Convective mixing occurs in the winter 95% of ultraphytoplankton is < 5  m at all stations. 60-70% of chl in Sept is dv chl a: 1-3 x 10 5 Pro/ml; 1x 10 4 Syns /ml; < 1x 10 3 picoeuks /ml 24-25°C 20°C Nitrate 3-6  M Phosphate 0.2  M < 5 nM nitrate 1.2-1.5  g/l chl a at depth 20-30 ng/l chl a at surface

2 27.4.99 0 50 100 150 200 0.0E+001.0E+052.0E+05 11.5.99 0 50 100 150 200 0.0E+00 1.0E+052.0E+05 8.3.99 0 50 100 150 200 0.0E+00 1.0E+05 2.0E+05 14.6.99 0 50 100 150 200 0.0E+001.0E+052.0E+05 Red Sea Flow Cytometry data 1999-2000 Pros Syns Euks

3 18.7.99 0 50 100 150 200 0.0E+001.0E+052.0E+05 23.8.99 0 50 100 150 200 0.0E+001.0E+052.0E+05 7.9.99 0 50 100 150 200 0.0E+001.0E+052.0E+05 4.10.99 0 50 100 150 200 0.0E+001.0E+052.0E+05 Red Sea Flow Cytometry data 1999-2000 Cells/ml Depth (m)

4 18.10.99 0 50 100 150 200 0.0E+001.0E+052.0E+05 22.11.99 0 50 100 150 200 0.0E+001.0E+052.0E+05 27.12.99 0 50 100 150 200 0.0E+001.0E+052.0E+05 10.1.00 0 50 100 150 200 0.0E+001.0E+052.0E+05 Red Sea Flow Cytometry data 1999-2000

5 16.2.99 0 50 100 150 200 2022242628 Temperature °C Depth (m) Red Sea Temperature Profiles 1999-2000

6 Temperature °C Depth (m) Red Sea Temperature Profiles 1999-2000

7 Temperature °C Depth (m) Red Sea Temperature Profiles 1999-2000

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