Float WMO_ID: 5901648

The table below provides basic information about the float, including primary sensors, mission parameters and current status of profiles.

This float was located to the east of the Kerguelen Plateau in the Southern Indian Ocean in a region bounded by 76 to 95 ºE and 45 to 50 º S.

The surface pressure for this float is shown in the plot below. There is no discernible drift in the value of the Surface Pressure Offset.

Potential Temperature-Salinity (a), Location (b, Max Temperature (c) and Sea Surface Salinity (d) plots located below.

Surface temperatures generally varied between 6.5 and 10.5 ºC and surface salinities from 33.6 to 34.6.

The plot below shows the potential-temperature/salinity curve for the deepest theta levels where the relationship between the two parameters should show the least variation.

The deep profiles look reasonable.

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 curve for the deepest theta levels for this float (in black) and nearby argo floats (coloured) is displayed below.

This float looks fine compared to neighbouring floats.

There was one inversion in profile 12 at 30 m which was QC'd as 4 for both T & S.

Salt hooks were located in profiles; 4,6,7,11,14,16,25,31,33,35,39,43,51,59,63,67,73. These were flagged as QC 4 for both T & S.

The float grounded on profiles; 1, 2, 3, 21 and 22. A few near bottom values were flagged as QC4 in profiles 1 and 2 which grounded.

Float trajectory overlayed on bathymetry, (left) and over climatological salinity (right)

Potential temperature section with time, (left) surface to 2000m and (right) surface to 500m

Salinity section with time, (left) surface to 2000m and (right) surface to 500m

Potential density section with time, (left) surface to 2000m and (right) surface to 500m

The plot below shows the analysis of salinity drift using the WJO/OW software.

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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 theta surface of 2.27 degrees C.

This float is similar to climatology. There is a large spread (up to 0.02) in the salinity data between some profiles as the float straddles a front.

The plots below show the raw float salinity data (solid blue line) compared to neighbouring argo floats (coloured symbols) on a potential temperature surface of 2.2 degrees C. The locality map shows the location of the profiles for this float and for neighbouring floats.

High variability region, and high variability in the float record - however this float looks reasonable given the wide spread evident in the data.

This float required no salinity drift correction.

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 27-07-2010