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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