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CTD Depth Profiles
Off-
Station 49
09:04 UTC
The CTD data showed that there was attenuating irradiance, with 1.8 at the surface and decreasing to 0 at 40 metres deep. The chlorophyll increased from 0.050 to 0.250 at approximately 30 metres deep at the deep chlorophyll maximum. Beyond this point the concentration of chlorophyll will decrease quicker due to the attenuating light for photosynthesis, resulting in fewer phytoplankton at these depths. The temperature decreased from 19oC at the surface to 13oC at a depth of 56 metres. The salinity in the water column remained fairly constant between 15 metres and 25 metres at around 35 PSU. On the ascent of the CTD, this value was also recorded at depths of 30 metres. The turbidity also remained fairly constant throughout the water column, with the highest values recorded at 44 and 56 metres deep. CDOM increased from 0.028 to 0.048 ppb QS between 40 and 56 metres deep.
Station 50
11:24 UTC
The CTD data showed that there was attenuating irradiance, with 1.6 at the surface and decreasing to 0 at around 30 metres deep. The chlorophyll increased from 0.050 to 0.250 at approximately 30 metres deep at the deep chlorophyll maximum. The temperature decreased from 18oC at the surface to 12oC at a depth of 25 metres, and then the temperature remained constant past this point. The salinity in the water column remained fairly constant throughout with slight fluctuations. The values remained around 35.1 PSU with highest values of 35.5 PSU at around 22 metres deep. The turbidity also remained fairly constant throughout the water column, with the highest value of 0.300 recorded at 15 to 20 metres deep, which might be as a result of an increase in chlorophyll and decrease in temperature at this depth. CDOM increased from 0.030 to 0.055 ppb QS between 20 and 25 metres deep which could potentially be as a result of an increase in phytoplankton that was recorded.
Station 51
12:16 UTC
The irradiance attenuation was shown to exponentially decrease with depth, with a value of 0 at approximately 40 metres deep. The chlorophyll was shown to increase from 0.050 to 0.230 at a depth of 25 metres. Deeper than 25 metres, the chlorophyll values decreased showing a chlorophyll maximum at approximately 25 metres deep, and past 35 metres there was no change in chlorophyll values. The temperature at the surface was 18oC, which decreased to 12oC at depths of 25 metres where the temperature of the water column remained fairly constant. The salinity at the surface of station 51 was 35 PSU but a large flux between 34.5 and 35.5 PSU was seen at depths between 15 and 25 metres. The turbidity increased to 0.340 at 25 metres deep, followed by a slight decrease and after the values remained constant. The CDOM data showed that there was an increase from 0.035 to 0.055 ppb QS at a depth of 25 metres and little variation was seen deeper than this point.
Station 52
13:00 UTC
Attenuating irradiance decreased exponentially with depth, with a value of 0 at around 45 metres deep (the deepest of all 5 stations). The chlorophyll surface value was 0.050, with two peaks recorded; one at 20 metres with a value of 0.180, and one at 27 metres with a value of 0.170. Past this point, fluctuations were seen in the water column. The temperature at the surface was recorded to be 18oC, which decreased to 12oC at 40 metres deep, with little change deeper than this point. The salinity was 35 PSU at the surface with a large fluctuation at 20 metres to a value of 35.6 PSU. This was recorded to be the chlorophyll maximum and no large changes past this depth. The CDOM values were constant to a depth of 20 metres, with a value of 0.031 ppb QS, and then increased to 0.050 ppb QS at 22 metres. Beyond this depth the CDOM values remained constant on the CTD. The turbidity showed slight fluctuations but the overall trend was remaining constant at 0.30 NTU.
