During the 2002 cruises four production line versions (#43020, #43166, #43262, and #43134) of the Sea-Bird SBE 43 oxygen sensor were used. Sensor #43020 belongs to STAG. As mentioned in the previous section, sensor #43166 was repaired and calibrated at Sea-Bird in January 2002; the sensor was repaired again in March and August 2002 after failing during HOT-135 and HOT-138 respectively. In both cases the sensor head assembly was replaced. The sensor failed again during HOT-140, and Sea-Bird replaced the sensor with a new sensor #43325 in October 2002. Sensor #43262 was acquired in March 2002 and failed during HOT-143, the sensor’s lid and membrane assembly was replaced and the electrolyte reservoir was re-backfilled at Sea-Bird in February 2003. Sensor #43134 was acquired in January 2002 and performed correctly during 2002 cruises.

     One YSI Inc. probe (#13251) was also used during HOT-134.

     Three sets of calibration parameters were usually obtained per HOT cruise, corresponding to the casts at Stations 1, 2 and 8. Table 4.14 shows the mean and standard deviation for the calibrated CTD oxygen minus water sample residuals for each cruise. Cruises HOT-142 and 143 had problems with the oxygen titration equipment, deeming the samples unreliable (Fitzgerald, 2003), thus the values for these cruises are not included in the table.

Table 4.14a: CTD-Bottle dissolved oxygen per cruise at Station Kahe (µmol kg-1). Cruises 142 and 143 oxygen samples not reliable (see text).

 

 

 

0 to 1500 dbar

Cruise

Sensor

Mean

SD

HOT-134

43020

0.00

0.37

HOT-135

43134

0.02

1.65

HOT-136

43134

0.01

0.82

HOT-137

43134

0.01

1.14

HOT-138

43134

-0.01

1.78

HOT-139

43262

-0.30

1.33

HOT-140

43262

0.00

0.74

HOT-141

43262

0.00

0.89

HOT-142

43262

-

-

HOT-143

43134

-

-

Table 4.14b: CTD-Bottle dissolved oxygen per cruise at Station ALOHA (µmol kg-1). Cruises 142 and 143 oxygen samples not reliable (see text).

 

 

 

0 to 4800 dbar

500 to 4800 dbar

Cruise

Sensor

Mean

SD

Mean

SD

HOT-134

43020

0.01

0.71

-0.01

0.68

HOT-135

43134

-0.02

0.68

-0.02

0.64

HOT-136

43134

0.01

0.80

0.02

0.69

HOT-137

43134

0.02

0.98

0.04

0.73

HOT-138

43134

0.08

0.91

0.02

0.75

HOT-139

43262

0.01

0.68

0.02

0.61

HOT-140

43262

0.04

0.86

0.07

0.63

HOT-141

43262

0.07

0.89

0.05

0.81

HOT-142

43262

-

-

-

-

HOT-143

43134

-

-

-

-

Table 4.14c: CTD-Bottle dissolved oxygen at Station HALE-ALOHA (µmol kg-1)

 

 

0-1500 dbar

Cruise

Sensor

Mean

SD

HOT-134

43020

0.00

0.57

HOT-135

43134

0.00

1.12

HOT-136

43134

0.00

0.77

HOT-137

43134

0.00

0.98

HOT-139

43262

0.00

0.85

HOT-140

43262

0.00

0.51

     Figure 4.15 shows the CTD oxygen data quality for every 2-dbar bin in each cast at Station ALOHA for cruises 134 through 143.

Figure 4.15. CTD oxygen data quality per cast (vertical bars) and per 2-dbar bin at Station ALOHA during HOT cruises 134 through 143. 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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