The table below provides basic information about the float, including primary sensors, mission parameters and current status of profiles.
Institute | CSIRO |
Principal Investigator | Susan Wijffels |
Pressure Sensor | Druck (serial number=10282) |
CTD Sensor | APEX-SBE-41 (serial number=2910) |
CTD Sampling Mode | Burst Sampler |
Controller Board | APF 8 |
Additional Sensors/Software | None |
Park Depth | 1000 m |
Profile Depth | 2000 m |
Launch Date | 24-10-2006 |
Number of D-moded Profiles | 121 |
Calibration Date | 07-09-2010 |
Pressure Drift | Surface Pressure corrected |
Salinity Drift | TBTO corrected for first 4 profiles, pfs 1 to 30 no drift. Serious biofouling issue from pf 31 onwards, profiles 31:38,62:66,85,90,92,127,141:146 salinity QC'd as 4. OW correction applied to profile 39 onwards which were affected by a minor fresh offset. |
This float was located in the Indian Ocean in an area bounded by 101 to 112 ºE and 22 to 30 º S.
The surface pressure for this float is shown in the plot below.
Potential Temperature-Salinity (a), Location (b, Max Temperature (c) and Sea Surface Salinity (d) plots located below.
The plot below shows the potential-temperature/salinity relationship for the deepest theta levels where the relationship between the two parameters should show the least variation.
The two plots below show a). the location of this float (black circles) in relation to the position of other nearby argo floats (coloured circles) and b). The potential-temperature/salinity curve for this float (in black) compared to nearby argo floats (coloured).
The potential-temperature/salinity relation for the deepest theta levels for this float (in black) and nearby argo floats (coloured) is displayed below.
There were numerous inversions, spikes, missing data etc in profiles; 8,16,34,36,37,38,40,41,42,45,62,63,64,65,66,69,72,76,83,84,86,87,88.
Salt hooks were located in profiles; 2,4,6,8,10,14,15,17,19,21,23,25,27,28,33,34,37,39,41,45,47,49,51,54,55,57,60,63,65,69,70,72,73,75. These were flagged as QC 4 for both T & S.
Early profiles corrected for TBTO. This float suffers from a serious but intermittent biofouling problem for profiles (31:38,62:66,85,90,92,127,141:146) salinity QC=4.
The plot below shows the analysis of salinity drift using the OW software.
The four plots below show the salinity anomalies on theta surfaces compared to (a) the Gouretski and Kolterman climatology, (b) the CARS (CSIRO Atlas of Regional Seas)/WOA (World Ocean Atlas) climatology, (c) the anomalies within the float series itself, (i.e. the salinity anomaly of each profile from the mean profile average for the float and (d) the raw float salinity compared to the CARS and G&K climatological salinity on a deep theta surface.
This float clearly suffers from TBTO and while close to climatology for the first thirty profiles it then suffers from intermittent biofouling, with a fresh offset from pf 39 onwards.
The plots below show the raw float salinity data (solid blue line) compared to neighbouring argo floats (coloured symbols) on a deep potential temperature surface. The locality map shows the location of the profiles for this float and for neighbouring floats.
This plot clearly shows that the float suffers from gross salinity drift from pf 31 onwards, It also appears that the offset may not be constant through the water column so is not correctible, profiles 31:38,62:66,85,90,92,127 and 141:146 salinity QC'd as 4.
This float suffers from TBTO for the first 4 profiles (corrected), agrees with climatology and nearby salt for pf 5 to 30, then suffers from serious, intermittent biofouling for profiles (31:38,62:66,85,90,92,127,141:146) where salinity is QC'd as 4. From pf 39 onwards an OW correction is applied as these profiles are fresh offset but correctable.
The plot below summarises the QC flags and salinity differences for the raw and adjusted salinity fields in the final delayed mode files submitted to the GDAC.
Created 10-12-2010