Based upon the research and the comparisons made in the sections above, the majority of the HOT bottle dissolved oxygen data are trustworthy. There are some data, however, which seem less reliable and have not yet been flagged as suspicious. Individual cruises that may contain suspicious data are listed in Table 1 along with a brief explanation.
Table 1: HOT Cruises with Possibly Suspicious Bottle Oxygen Data
HOT Cruise |
Reason |
1 through 9 |
Wrong titration method used (Sect. 2.2.1 ) |
10 |
Wrong titration method used, and high CV% (Sects. 2.2.1 and 4.1) |
11 through 30 |
Visual titration endpoint used (Sects. 2.2.1 and 2.2.2) |
16 |
Low deep water dissolved oxygen concentrations (Sect. 4.2.3) |
32 |
High oxygen saturations at 5 dbar. (Sect. 4.2.1) |
33 |
Larger than normal oxygen concentrations at 1000 dbar (Sect. 4.2.2) |
49 |
High oxygen saturations at 5 dbar. (Sect. 4.2.1) |
142 through 147 |
Trend of lower than normal concentrations apparent in the 5 dbar saturation plots, in the deep water plots, and at other depths (Sects. 4.2.1, 4.2.3, and 4.2.4) |
Oxygen data from the first ten cruises, particularly the data from HOT-10, should be treated semi-suspiciously. Although the precision values from some of these cruises were less than 0.1%, the fact remains that it was the wrong method of determination that was being used. The high CV% of HOT-10 makes the oxygen data from that cruise especially suspicious.
The oxygen sample data from HOT-142 through 147 have been flagged as bad based on the analysis above. Data users are advised to use the calibrated CTD oxygen data at the depths where the bottles fired instead of the oxygen sample data.
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