During the 2001 cruises two developmental versions (#43004 and #43045), and three production line versions (#43019, #43020 and #43166) of the Sea-Bird SBE-43 oxygen sensor were used. Sensors #43019 and #43020 belong to STAG. Sensors #43004 and #43045 were calibrated at Sea-Bird before each cruise. Sensors #43019 and #43020 were calibrated in April 2001. Sensor #43020 was repaired and calibrated in November 2001 after failing during HOT-129. Sensor #43019 was also sent to Sea-Bird for repair in October 2001, after failing during HOT-131 and 132. Sensor #43166 was acquired in November 2001, but failed during HOT-133 and was repaired and calibrated at Sea-Bird in January 2002.
Two YSI Inc. probes (#13434 and #13251) were also used during HOT cruises; these sensors were calibrated in February 2001 at Sea-Bird. Sensor #13434 failed during HOT-132 and was retired of use. Sensor #13251 had its membrane replaced during HOT-126. Both sensors had their membrane and electrolyte replaced prior to HOT-130.
Three sets of calibration parameters were usually obtained per HOT cruise, corresponding to the casts at Stations 1, 2 and 8. Table 4.13 shows the mean and standard deviation for the calibrated CTD oxygen minus water sample residuals for each cruise.
Table 4.13a: CTD-Bottle dissolved oxygen per cruise at Station Kahe (µmol kg-1)
|
|
|
0 to 1500 dbar
|
|
|
Cruise
|
Sensor
|
Mean
|
SD
|
| HOT-122 |
13251 |
0.02 |
0.82 |
| HOT-123 |
13251 |
0.01 |
0.94 |
| HOT-124 |
43004 |
0.01 |
1.25 |
| HOT-125 |
43004 |
0.01 |
1.32 |
| HOT-126 |
43004 |
0.01 |
1.00 |
| HOT-127 |
43004 |
0.01 |
0.74 |
| HOT-128 |
43004 |
0.00 |
0.99 |
| HOT-129 |
43045 |
0.01 |
0.96 |
| HOT-130 |
43019 |
0.01 |
0.99 |
| HOT-131 |
43045 |
0.00 |
0.50 |
| HOT-132 |
43045 |
0.01 |
0.87 |
|
HOT-133 |
43020 |
0.01 |
0.68 |
Table 4.13b: CTD-Bottle dissolved oxygen per cruise at Station ALOHA (µmol kg-1)
|
|
|
0 to 4800 dbar
|
500 to 4800 dbar
|
||
|
Cruise
|
Sensor
|
Mean
|
SD
|
Mean
|
SD
|
| HOT-122 |
13251 |
0.11 |
0.86 |
0.06 |
0.74 |
| HOT-123 |
13251 |
0.03 |
1.06 |
0.22 |
0.95 |
| HOT-124 |
43004 |
0.17 |
0.93 |
0.00 |
0.94 |
| HOT-125 |
43004 |
0.11 |
1.22 |
0.08 |
1.32 |
| HOT-126 |
43004 |
0.09 |
0.89 |
0.03 |
0.80 |
| HOT-127 |
43004 |
0.07 |
0.87 |
0.03 |
0.72 |
| HOT-128 |
43004 |
0.02 |
1.05 |
-0.06 |
1.07 |
| HOT-129 |
43019 |
0.01 |
0.78 |
-0.02 |
0.68 |
| HOT-130 |
43019 |
0.11 |
1.05 |
0.09 |
0.97 |
| HOT-131 |
43045 |
0.07 |
0.89 |
0.05 |
0.81 |
| HOT-132 |
43045 |
0.04 |
0.79 |
0.05 |
0.78 |
|
HOT-133 |
43020 |
0.03 |
0.86 |
-0.05 |
0.72 |
Table 4.13c: CTD-Bottle dissolved oxygen at Station HALE-ALOHA (µmol kg-1)
|
|
|
0-1500 dbar
|
|
|
Cruise
|
Sensor
|
Mean
|
SD
|
| HOT-122 |
13251 |
0.04 |
1.48 |
| HOT-124 |
43004 |
0.01 |
0.87 |
| HOT-125 |
43004 |
0.01 |
0.92 |
| HOT-126 |
43004 |
0.02 |
0.98 |
| HOT-127 |
43004 |
0.00 |
0.98 |
| HOT-128 |
43004 |
-0.01 |
1.18 |
| HOT-129 |
43019 |
0.00 |
0.85 |
| HOT-130 |
43019 |
0.00 |
1.49 |
| HOT-131 |
43045 |
0.01 |
0.62 |
| HOT-132 |
43045 |
0.01 |
1.23 |
|
HOT-133 |
43020 |
0.00 |
0.41 |
Figure 4.14 shows the CTD oxygen data quality for every 2-dbar bin in each cast at Station ALOHA for cruises 122 through 133.
Figure 4.14. CTD oxygen data quality per cast (vertical bars) and per 2-dbar bin at Station ALOHA during HOT cruises 122 through 133. The tick marks along the x-axis separate different casts. Casts from the same cruise are separated by vertical black lines.
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